ISSN 2096-7780 CN 10-1665/P

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Anomaly trend analysis of satellite thermal infrared and TEC before two strong earthquakes in Turkey on February 6, 2023
Tang Haocong, Liao Hongyue, Wu Jia, Wang Gang
 doi: 10.19987/j.dzkxjz.2023-021
[Abstract](53) [FullText HTML](26) [PDF 11067KB](13)
The two successive earthquakes of magnitude 7.8 in Turkey on February 6, 2023, were a remarkable tectonic movement and a particularly typical scientific experiment scene. At present, various observational data are abundant, providing a perfect opportunity for scholars around the world to verify their conjectures, models and conduct experiments. By using the thermal infrared annual mean line difference amplitude enhancement ratio method and the sliding annual moving average method of TEC (Total Electron Content) microscopic anomaly events, which are both created by the writer, we found that there were high intensity thermal infrared anomalies in the east and west sides of the epicenter area in late April to early May and in August 2022, respectively. About one month before the earthquake, the synchronous thermal infrared activity of the east and west sides of the epicenter and the northern region was significantly enhanced. In particular, the annual mean line difference amplitude enhancement ratio of the northern region hit the highest record since 2018 on January 31, 2023, and was 2.5 times the average level of the four years before the earthquake. The sliding annual moving average method of TEC microscopic anomaly events showed that the annual mean value of TEC microscopic anomaly events in the epicentre and its vicinity began to decline rapidly from 2021, and the annual mean value before the earthquake hit the lowest level in history, which was only about a quarter of the previous high since 2000. The two anomalies of thermal infrared and TEC are highly overlapping in time and space, and the earthquake occurred in the above two abnormal regions, indicating that the two anomalies may be closely related to this seismic series.
Rambling in earthquake 5000 years:Preface
Feng Rui
 doi: 10.19987/j.dzkxjz.2023-046
[FullText HTML](24) [PDF 2216KB](12)
A brief discussion on the specific ways to carry out science popularization education of earthquake prevention and disaster reduction for primary and secondary school students:Taking “National Security Education Day for Primary and Secondary School Students” as an example
Jin Zhihui, Wu Lan, Wu Tong, Zhou Jinling, Zou Xinci, Guo Ye, Chi Yuan
 doi: 10.19987/j.dzkxjz.2023-076
[Abstract](12) [FullText HTML](7) [PDF 1700KB](2)
This paper briefly summarized the structural characteristics of earthquake zones, the frequency of seismic activities, the number of primary and secondary school students and the volume of earthquake prevention and disaster reduction science popularization team in China. Taking “National Security Education Day for Primary and Secondary School Students” as an example, through two aspects of traditional science popularization education and new media science popularization education, seven specific forms of science popularization education are introduced, including earthquake emergency evacuation drills, lectures on science popularization knowledge, thematic research, knowledge competitions, live broadcast on mobile Internet, online education cloud platform, and intelligent digital interactive experience. These provided some valuable references for relevant functional departments of earthquake, education, emergency management, and primary and secondary schools to carry out a series of activities of earthquake prevention and disaster reduction science popularization education for primary and secondary school students. By promoting the continuous enrichment of earthquake prevention and disaster reduction science popularization forms and the continuous improvement of primary and secondary school students’ awareness and ability of earthquake prevention and disaster reduction, the broad masses of primary and secondary school students will gradually become “the future of the country” who understand earthquakes, respect earthquakes, and understand how to prevent earthquake hazards.
Analysis and treatment on common faults for VP broadband tiltmeter at Changting seismic station
Zheng Yongtong, Quan Jianjun, Zheng Jianzhi, Liu Suyun, Wang Shaoran
 doi: 10.19987/j.dzkxjz.2023-098
[Abstract](4) [FullText HTML](0) [PDF 2526KB](0)
In September 2017, Changting seismic station installed VP broadband tiltmeter. From its operation in recent years, the instrument has a high degree of automation and observation accuracy, which can provide more reliable observation data for earthquake analysis and forecast. However, its stability is poor. The output zero drift of VP broadband tiltmeter is serious, which often need to zero. Although the automatic zero device has been added, which can achieve remote zero function through the network to avoid interference with the instrument due to personnel entering the hole, the zero module often failure including motor overload, chip burn out. In this paper, the common faults of the VP broadband tiltmeter in daily observation were analyzed to seek solutions to instrument failure, and summarize the VP broadband tiltmeter daily maintenance. We can quickly determine the cause of the instrument failure, timely complete the instrument maintenance, ensure continuous and reliable data in the future similar problems in the observation process.
Practice of digitizing the observation logs of earthquake monitoring stations in Jiaxing City
Zhong Wei
 doi: 10.19987/j.dzkxjz.2023-002
[Abstract](62) [FullText HTML](35) [PDF 4017KB](12)
In order to improve the modern management level of unattended seismic monitoring stations in cities and counties, standardize the management of observation logs in stations, and improve the display of seismic monitoring work in cities and counties, Jiaxing Seismic Survey and Prevention Center actively explored the implementation of digital management of seismic monitoring stations through the development of the “Digital Observation Log Project of Seismic Monitoring Stations”. This paper mainly introduces the basic ideas and technical approaches of the research and development of the project, and briefly describes the main functions of the system. The implementation of the project can effectively solve the drawbacks of the traditional paper-based observation logs of seismic monitoring stations, and realize the digital management of the basic information of seismic monitoring stations and daily operation and maintenance. The project also builds the QR code for station information, effectively giving full play to the role of city and county monitoring stations in science popularization and publicity in earthquake prevention and disaster reduction, emergency response, disaster prevention culture and other aspects, and expanding the social service function of stations.
Anomaly characteristics of Shanxi geomagnetic array data before Yuanping M4.2 earthquake
Zhang Liang’e, Chen Changjun, Gong Jingzhi, Guo Yu, Fan Lei, Shi Shuting
 doi: 10.19987/j.dzkxjz.2022-165
[Abstract](10) [FullText HTML](6) [PDF 2120KB](1)
Shanxi Earthquake Agency and Institute of Geophysics, China Earthquake Administration cooperated to build a geomagnetic array by deploying five sets of GM4 fluxgate magnetometers to obtain the three components magnetic observation data of the regional site on both sides of the Hengshan fault zone in northern Shanxi from September 2014. The geomagnetic array had been operated normally during this period. The completeness and internal quality of recorded data meet the expected standards. On April 7, 2016, a M4.2 magnitude earthquake occurred in Yuanping, about 20 kilometers away from the nearest Daixian measuring point of the geomagnetic array. Through the analysis of the 12-month data from October 2015 to September 2016 by using three methods of correlation, load-unload response ratio and polarization, it is found that the data from each measuring point 3~6 months before the earthquake showed anomalies, among which the correlation of Daixian and Fansi measuring points is the worst. The load-unload response ratio (3.9) of Daixian measurement point exceeds the threshold of 3.5. The polarization value of each measuring point has a high value change two months before the earthquake, but only Daixian measuring point has a high value change one month before the earthquake. The abnormality is very obvious. In the author’s opinion, compared with the magnetic anomalies observed at a single station, this study of multiple observation points and multiple methods has improved the reliability, and provides a reference basis for the future multidisciplinary and multi-method joint earthquake prediction research.
Research on the Characteristics and Identification of Non Natural Earthquake Records of Zhaotong Xunlong Strong Rammed Soil
Peng dengjing, Wang zelan, Ma minwei, Ma da
 doi: 10.19987/j.dzkxjz.2023-052
[Abstract](2) [FullText HTML](1) [PDF 3848KB](0)
This article analyzes the recorded characteristics and differences of multiple heavy ground leveling machine construction and small magnitude natural earthquake events from November 2022 to April 2023 in Zhaotong Xunlong. Analysis shows that the initial motion of the P-wave of the Zhaotong Xunlong strong rammed soil event is downward, with a short duration, fast attenuation, and the maximum amplitude of the P-wave and S-wave is smaller than that of natural earthquakes. The spectral characteristics recorded by the waveform of the strong rammed soil event are significantly different from those of natural earthquakes, and the seismic phase of the natural earthquake P-wave and S-wave is obvious, while the seismic phase of the strong rammed soil event is not obvious. Utilizing Pg/Sg spectral ratio and cross Pg/Sg spectral ratio to achieve classification and recognition of non natural earthquakes and natural earthquake events in dynamically compacted soil. The classification results indicate that when the frequency is greater than 5 Hz, the Pg/Sg spectral ratio criterion basically achieves the classification of natural earthquakes and strongly compacted soil events; The classification recognition accuracy corresponding to the cross Pg/Sg spectral ratio criterion is 91.7% for natural earthquake events and 89.2% for strong compacted soil events. The cross Pg/Sg spectral ratio criterion better reflects the characteristic differences between natural earthquakes and strongly compacted soil events than the single frequency band spectral ratio criterion.
Hainan Operation Maintenance System for GeoScience Observarory Network auxiliary platform system Design and implementation
ZHANG Huamei, CHEN Xiangkai, Pang Xinbai, Huang Jingguo, Huang Zhangrong, Hong Xuyu
 doi: 10.19987/j.dzkxjz.2023-101
[Abstract](1) [FullText HTML](1) [PDF 2239KB](0)
In order to solve the problem of efficient and convenient operation and maintenance of Hainan Operation Maintenance System for GeoScience Observarory Network, the project is based on B / S architecture, using Django, uswgi, Virtualenv and Python and other technical means to design and implement a set of Hainan geophysical station network operation and maintenance auxiliary system, The platform system has the characteristics of high efficiency, convenience and easy operation, and can realize one-click parallel transmission of backed up data from server to mobile hard disk or computer, It can realize one-click quick access to service software and hardware conditions and database status. In addition, one-click backup of important database data through page visualization operation can avoid repetitive operation, and one-click output of monthly report of Excel tables with parameters such as server and database can be realized. Through the auxiliary work of this platform system, it is helpful to improve the work efficiency of operation and maintenance of Hainan geophysical station network, reduce the burden of operation and maintenance, and provide data integrity, continuity, safety and security work.
Rambling in earthquake 5000 yrs (1): Far ancient, evolution of the Earth according to a legend
Feng Rui
 doi: 10.19987/j.dzkxjz.2023-047
[Abstract](6) [FullText HTML](1) [PDF 2904KB](3)
Where did I come from and where am I going? It was an amazing question since I was a child. Now it's better, we can know some, but still don't know more. The ancient literature of Gong Gong Touch Mountain actually speaks some information about earthquake, for the first time in the world. To force people to understand the basic concepts of the origin and evolution of the universe and the earth, the Last Glacial Maximum, the Coriolis effect and so on. This facilitates going to research the diversion of the Yellow River before the Yu’s water treatment. The abandonment of the Huai River and the northward flow of the Yellow River was a natural disaster that occurred in the late Neolithic period. It was inferenced that earthquakes occurred in Yellow River caused this disaster, there were some examples such as Huaxian event in 1556 and Sanmenxia event in 1815 , the mountains and rivers were forced to change a lot. Actually, the fantastic old legends often foretell the truth and may help us understand the coming and going of the earth.
Introduction to the National Earthquake Hazards Reduction Program and the Latest Strategic Plan
Zhu Lin, Lian Weiping, Chen Hongbo, Li Yumei
 doi: 10.19987/j.dzkxjz.2023-086
[Abstract](4) [FullText HTML](1) [PDF 2831KB](2)
The National Earthquake Hazards Reduction Program (NEHRP) is the main coordination plan for earthquake disaster reduction at the level of the Federal government of the United States.The United States Congress has made periodic adjustments in the form of planned re authorizations, In 1990, 1997, 2000, and 2004, adjustments were made to the focus and supervision of NEHRP through re authorization. In fact, the 2004 re authorization bill expired in 2009. Although the US Congress continued to provide funding annually, the re authorization was delayed until 2018. In the 2018 adjustment, NEHRP made significant directional adjustments to highlight earthquake warning and earthquake resilience construction. In May 2023, NEHRP released the "Strategic Plan for the NEHRP Fiscal Years 2022-2029" on its website, implementing the adjustment requirements of the 2018 Reauthorization Act, sorting out and integrating existing NEHRP goals and tasks, setting four integration goals and eighteen support tasks, and determining eight key investment areas. This plan is a guiding document for the new stage of earthquake disaster reduction in the United States, and has strong reference significance for China's earthquake prevention and disaster reduction work.
Thinking on ways to strengthen the publicity and education of earthquake prevention and disaster reduction in colleges and universities
Li Xia
 doi: 10.19987/j.dzkxjz.2023-092
[Abstract](6) [FullText HTML](6) [PDF 1978KB](3)
Schools are important places to carry out earthquake disaster education, and the publicity and education of earthquake prevention and disaster reduction in colleges and universities is to improve the results of earthquake safety education in primary and secondary schools. Strengthen the awareness and skills of college students in earthquake prevention and disaster reduction, make them change their role to serve the social output, and take the initiative to undertake the publicity and popularization of earthquake disasters, which is conducive to improving the ability of earthquake prevention and disaster preparedness of the whole people. In view of the problems found in the practice of popular science popularization, this paper compares the differences between universities and other academic sections of earthquake popular science popularization through questionnaire survey, analyzes the reasons and summarizes the experience, and puts forward the ways to strengthen the publicity and education of earthquake prevention and disaster reduction in universities. The analysis points out that the publicity and education of earthquake prevention and disaster reduction for college students is a continuous and dynamic project, and colleges and universities need to vigorously carry out earthquake safety education in many aspects such as concept, knowledge, skills and responsibilities, and at the same time need to rely on the strength and resources of relevant departments to improve the publicity and education effect.
Research on Tidal Disturbance Phenomenon of DSQ tiltmeter at Yanziyan Observation Station,Yunnan
Cao Bailun, Yang Yue, Kuang Fujiang, Zhao Zhengxian, Duan Yong, Li Wang
 doi: 10.19987/j.dzkxjz.2023-093
[Abstract](10) [FullText HTML](3) [PDF 4320KB](2)
The DSQ tiltmeter at Yunnan Yanziyan Observation Station frequently records high-frequency disturbances in various components, manifested in the form of thickened observation curve pulsation, and the replacement of amplification boxes, coils, lines, data acquisition, etc. failed to eliminate this high-frequency disturbance.After comparing with actual meteorological observation data, it was found that there is a certain degree of synchronization between tidal disturbances and atmospheric pressure fluctuations.After further diagnosis, investigation, and analysis, it has been determined that the cause of high-frequency disturbance is:The bowl cover of the DSQ tiltmeter lacks air pipes, resulting in independent cavities above the liquid levels at both ends of the tiltmeter. The pressure balance at both ends of the liquid level is disrupted, causing high-frequency disturbances.After punching the bowl cover, high-frequency disturbances are eliminated.The process and method of diagnosing and eliminating high-frequency disturbances are of great significance for improving the quality of solid tide observation using the DSQ tiltmeter, and have reference and reference value for improving and managing similar instruments.
Research Hotspots and Frontier Evolution of Earthquake Disasters in China Based on Citespace
HUANG Feng, ZHANG Lulu, ZHOU Zhihua, HE Yafeng, WANG Yue
 doi: 10.19987/j.dzkxjz.2023-065
[Abstract](7) [FullText HTML](2) [PDF 3129KB](2)
Based on the literatures in the field of earthquake disaster research in China in recent 20 years (2003-2022) collected by China Knowledge Network, this article studied the overall distribution, research hotspots and frontier evolution trajectory of earthquake disaster research by using the scientometric software Citespace. The results show that in the past 20 years, there has been a limited number of literature on earthquake disaster research, which is closely related to earthquake events. Research institutions mainly focus on functional departments responsible for earthquake work, and the main research hotspots are focused on obtaining disaster data and extracting disaster information. After analysis, the evolution trajectory of earthquake disaster research can be divided into the initial stage, development stage, and deepening stage. The current research hotspot mainly focuses on the acquisition of disaster data, which is in the early stage of earthquake disaster research and an important stage of laying a solid foundation. In the future, the research of earthquake disasters in China should strengthen the integration of disciplines, pay attention to expanding the research direction of disaster information extraction, disaster report and release, and realize the intelligence, dynamics and three-dimensional of earthquake disasters by combining mainstream technologies.
Precious historical documents-T. Torrance's “Tieh-chi Earthquake of August 1933 and Afterwards”
Xu Jiting, Hong Shizhong
 doi: 10.19987/j.dzkxjz.2023-079
[Abstract](4) [FullText HTML](1) [PDF 2245KB](3)
British missionary T. Torrance lived in Sichuan, China for a long time, and he personally experienced the Diexi (Tieh-chi) earthquake in Sichuan Province in 1933. In July 1934, he visited the site of the earthquake, then wrote the article “Tieh-chi Earthquake of August 1933 and Afterwards”, which was published in the “The West China Missionary News” in November of the same year. Torrance's life and his experience during the Diexi earthquake are introduced, the main contents of the article “Tieh-chi Earthquake of August 1933 and Afterwards” are disclosed and reviewed. Description of the Diexi earthquake disaster and its secondary flood in Torrance's article is basically objective and true, and many details can be verified with geologist Chang Longqing's “Investigation report on Diexi earthquake of Sichuan” and the research results of later generations. It has a certain scientific value, is another precious earthquake historical documents. Besides, some suggestions are put forward for further excavation of historical earthquake documents.
Rambling in earthquake 5000 yrs. (4): Zhou·Exploring earthquake regularity
Feng Rui
 doi: 10.19987/j.dzkxjz.2023-057
[Abstract](7) [FullText HTML](3) [PDF 6721KB](4)
The 780 B.C. earthquake in Qishan was the first earthquake in Chinese history since there was a clear chronology, and the society paid high attention to it. Ancient thinkers did not stop at the superficial phenomenon of earthquake damage, but took the first primitive step in exploring the laws of earthquakes. Boyang proposed the concept of yin and yang, which was the first time that the objective world was understood in terms of the mutual struggle between two contradictory parties. Yanzi paid attention to the relationship between the stars and the earthquakes, and Zhuangzi pointed out the characteristics of recurring earthquakes. This paper presents the modern scientific understanding and development of earthquake examples in these three respects, and finally, the basic concept of of commensurability method is introduced briefly.
Summary of Optimization Practice of Earthquake Network of Shaanxi
Zhao Jiexu, Chang Jun, Cheng Yan, Dou Jing
 doi: 10.19987/j.dzkxjz.2023-056
[Abstract](4) [FullText HTML](0) [PDF 2296KB](1)
The Earthquake Network of Shaanxi undertakes functions such as earthquake data collection and forwarding, earthquake rapid reporting and cataloging, public information services, and earthquake emergency response. After years of construction and operation, it has developed a certain level of security and defense capabilities. However, with the continuous development of the public network security industry, problems of different levels in the network structure,security defense, equipment configuration, computer room environment and institutional construction of the Shaanxi earthquake industry network have been discovered. This article is based on classified security protection evaluation and password application evaluation, optimizing and upgrading the earthquake network of Shaanxi through reshape network structure, optimize equipment configuration, improve institutional mechanisms, upgrade computer room environment etc. It provide a good foundation for the network optimization, technology upgrade, maintenance guarantee, safe operation, and effective management of the Earthquake Network of Shaanxi. At the same time, it can provide reference for network optimization and upgrading in other industries or units.
Rambling in earthquake 5000 yrs. (3): Shang·Earthquake landslides cause multiple disasters
Feng Rui
 doi: 10.19987/j.dzkxjz.2023-050
[Abstract](8) [FullText HTML](1) [PDF 17995KB](4)
Most of the earthquakes recorded during the Shang and Zhou periods were in the western Sichuan-Shaan-Gan border area, where hill-collapses were very common. Modern science has classified the phenomenon of "landslides" into four main forms: rockfall, avalanche, landslide and debris flow, of which landslides and slides caused by earthquakes are the most dangerous. Specifically, we introduced the disasters of Wenchuan, Jianjiang, Diexi and Moxi earthquakes, especially the mechanism of Wangjiayan landslide, focusing on the occurrence of three major secondary disasters: landslide, river diversion and weir failure. It is pointed out that the site conditions of thrusting and repeated rupture on the Tibetan Plateau were the key reasons of the disaster.
Rambling in earthquake 5000 yrs. (2): Upper ancient·Seismic archaeological study of ancient events
Feng Rui
 doi: 10.19987/j.dzkxjz.2023-048
[Abstract](3) [FullText HTML](4) [PDF 19321KB](3)
As the only precious written records in the world, the Bamboo Book of Chronicles and others historical literatures all recorded an earthquake and climate change shortly after Dayu ruled the waters. Archaeological studies have confirmed its authenticity and revealed the significant impact of the Northern Hemisphere's "Little Ice Age" on global ecological civilization. This paper introduces some characteristics of seismic activity in the middle and lower reaches of the Yellow River, and also the impact on the Yellow River outburst. Some of the advances in seismic archaeology in recent years are described briefly.
The influence of pile-soil interaction springs on the inclined liquefied site-group pile-supertructure system
Wang Zhiyang, Jia Kemin, Xu Chengshun, Du Xiuli
 doi: 10.19987/j.dzkxjz.2023-061
[Abstract](2) [FullText HTML](3) [PDF 3581KB](2)
The dynamic interaction of pile-soil-superstructure system is a complex process, especially in inclined liquefaction-induced lateral spreading site. Due to the permanent large deformation of the ground generated during the earthquake, nonlinear reactions such as sliding and cracking may occur between piles and soil. Therefore, the simulation of pile-soil interaction is crucial. In order to explore the influence of nonlinear contact between pile and soil on the dynamic response of the inclined liquefied site-group pile-supertructure system, the finite element numerical models considering the pile-soil interaction springs and the direct binding between the pile nodes and soil nodes were established based on OpenSees. The results indicate that when considering the Pyliq springs for pile-soil interaction, the amplitude of soil acceleration is slightly lower, the constraint of the pile foundation on the soil becomes significantly weaker, and the residual displacement of the soil increases. Meanwhile, models with Pyliq springs can better simulate the curvature response of piles, while models that directly bind pile nodes and soil nodes overestimate the curvature of the pile top, making it difficult to accurately estimate the most unfavorable position of pile bending resistance. The influence of pile-soil interaction springs on the dynamic response of the upper structure is relatively small.
Data quality and spectrum analysis of geoelectric field at Wengtian station in Hainan
Guo Mingrui, Wang Xijiao, Lu Qiming, Li Dongya, Pang Xuehua, Guo Yuqin, Xie Xiaojing
 doi: 10.19987/j.dzkxjz.2023-045
[Abstract](6) [FullText HTML](4) [PDF 4614KB](0)
The observation object of the geoelectric field observation system is the geoelectric field intensity vector. Its purpose is to explore the change of the geoelectric field before earthquake, to obtain the electrical structure and its change law of underground and rock layer, and to develop the change characteristics of the geoelectric field in the process of seismogenesis by observing the intensity of geo electric field on the surface. The data of Wengtian geoelectric station since its establishment are sorted out in detail, and the quality of the data since its operation is analyzed by calculating the difference and correlation, the reasons for the good data quality are summarized, and some suggestions on how to improve the data quality in the next step are given. The curve of geoelectric field observation data at Wengtian station has an obvious daily variation form of one peak and one valley. The spectrum analysis shows that the dominant periods are 24, 12 and 6 hours, with 24 hours as the main period. By using the method of dominant azimuth angle, it is found that the dominant azimuth angle is narrowed and deflected from 2017 to 2018, and the anomaly is analyzed and discussed.
Comparative analysis of emergency rescue of two Haiti M7.3 earthquakes
Gao Na, Wang Haiying
 doi: 10.19987/j.dzkxjz.2022-164
[Abstract](48) [FullText HTML](26) [PDF 2067KB](7)
Haiti is a country with a relatively backward economy for a long time. The severe poverty situation has led to the vulnerability of the society to cope with disasters. On the one hand, the government cannot provide a large amount of funds to build shockproof and anti-seismic houses. On the other hand, it has not formulated building standards effectively, and there are no mandatory construction laws and regulations, which results in the lack of planning for building construction, the general lack of fortification of buildings, poor seismic performance and heavy losses after the earthquake. In 2010 and 2021, earthquakes of magnitude 7.3 occurred in Haiti respectively, and caused a large number of casualties. This paper analyzes and summarizes the emergency response and rescue capacity of the two earthquakes from three aspects: casualties caused by the two earthquakes, Haiti government emergency response and disaster relief effect, and assistance from international rescue organizations. The results showed that the international rescue forces have participated in the two earthquake disaster rescue, and the earthquake rescue in 2010 was a state of anarchy. The rescue activities were mainly carried out by international forces, supplemented by the Haitian government. The emergency response speed of the government has improved significantly in 2021, and the government played absolutely an leading role in disaster relief. The analysis and study of international rescue cases and international rescue forces can provide effective decision-making suggestions for the dispatch of China’s international rescue teams and foreign aid.
Discussion on Common Problems in Data Tracking and Analysis of Geomagnetics
Quan Jianjun, Zheng Yongtong, Wang Shaoran, Chen Shanhua, Fang Chuanji
 doi: 10.19987/j.dzkxjz.2023-016
[Abstract](7) [FullText HTML](1) [PDF 2831KB](2)
The tracking and analysis work of precursor network observation data is comprehensively carried out at precursor stations and regional centers. The event records generated by the tracking and analysis of earthquake precursor data demonstrate the dynamic changes of precursor network observation data. This article starts from the current situation of data tracking and analysis in the field of geomagnetism, proposes precautions for data tracking and analysis in this field, and discusses common problems in geomagnetic tracking and analysis through multiple aspects such as event leakage analysis and over analysis, data type selection, event start and end time, event analysis description, map drawing and annotation, event type classification, and geophysical event analysis, and proposes corresponding solutions, Finally, measures are proposed for the promotion of data tracking and analysis in the field of geomagnetism. I hope to provide reference and reference for the observation personnel of geomagnetic stations to better carry out data analysis research and output application work, provide a solid foundation for the prediction and scientific research of geomagnetic disciplines, and promote the shift of the focus of daily work of earthquake precursor networks from observation to both observation and application.
Analysis of seismicity characteristics in southern Jiangxi and neighboring areas
Lai Zhihua, Deng Yueyuan, Luo Yemei
 doi: 10.19987/j.dzkxjz.2023-032
[Abstract](10) [FullText HTML](5) [PDF 3184KB](0)
In this paper, the characteristics of time, space, strong and activity frequency, bvalue, strain energy release of moderate earthquakes in south Jiangxi and its surrounding areas (23.66°—27.20°N , 113.50°—118.84°E) are analyzed. The results show that, tthe area has a background of moderate and strong seismicity, modern small earthquakes are distributed in dense belts. The main aftershock type and swarm type are the main earthquake sequences above moderate strength. Since 1971, seismic activity has continued to be active, the earthquake of ML≥4.0 shows obvious clustering property, The spatial and temporal concentration of seismicity is the main phenomenon; The seismicity of ML≥3.5 earthquake is periodic,Including the high active period, the low active period and the occurrence of destructive earthquake events; When the B value is always lower than the annual average value, the moderate and strong earthquakes are active; The rate of strain energy release curve shows an accelerating trend before moderate earthquakes are active. The results of this study provide some important reference information for predicting the time, space and intensity of earthquakes in this region, It is helpful for close observation of seismic activity in this area.
Scientific plans and concepts of associated researches on earthquake forecast in Japan for recent years
Zhang Yan, Bi Jinmeng, Jiang Changsheng
 doi: 10.19987/j.dzkxjz.2022-135
[Abstract](10) [FullText HTML](4) [PDF 2262KB](2)
Although Japan constitutes only 1% of the total landmass in the world, it experiences around 10% of global seismicity, particularly the catastrophic great earthquakes. To address the issue, Japanese initiated earthquake forecast research programs since the year of 1965, which underwent several stages of planning and revision. In recent years, with the rapid progresses of information science, Japanese incorporated information science into earthquake research, and launched “Seismic Research Utilizing Information Science” program aimed at fostering innovative studies in the realm of novel earthquake forecast science. Presently, Japan Meteorological Agency maintains the overall viewpoint that “the occurrence time of interplate earthquakes can be predicted to a certain extent, but available researches show future earthquake cannot be forecasted. The focus lies in forecasting ground intensity of future earthquakes.” The scientific research philosophy regarding earthquake forecast is shifting from the initial notion of “forecasting the occurrence of disasters” toward “forecasting the developmental process of disasters”.
Research on the application of underwater node seismograph in land active source detection
SUN Dianfeng, WANG Yahong, QIN Manzhong, ZOU Rui, WAN Wenqi, WANG Zhidong
 doi: 10.19987/j.dzkxjz.2023-015
[Abstract](58) [FullText HTML](38) [PDF 3784KB](7)
The precise moment of the active source excitation is very important. In order to obtain a more accurate excitation moment, we first debugged and installed the underwater node Seismometer observation system in the Liujiaxia active source, recorded the excitation data, and obtained a more accurate excitation moment. Experiments show that the underwater node Seismometer observation system can clearly record the air gun source excitation signal. At the same time, the background noise analysis was carried out for the observation data in calm. The noise power Spectral density was lower than the NHNM noise curve, and the background noise value of each item was less than −120 dB. Compared with the background noise of the instruments erected on the shore, the noise recorded by the underwater Seismometer was slightly higher than the noise of the onshore Seismometer, which may be related to water waves, wind and ship navigation. Spectral analysis of excitation data shows that the dominant frequency is within the range of 2−8 Hz, which is consistent with previous research results and can be used as one of the reference stations for recording active source excitation signals in Liujiaxia. The application of underwater node Seismometer in land active source detection will be of certain value for improving the observation accuracy of air gun active source and the construction of air gun active source seismic monitoring system and data processing.
Analysis of present tectonic dynamic background in Northeast China based on focal mechanism
Bing Feng, Yaxuan Hu, Xuchao Chai, Yang Li, Yuan Jin, Wei Liu, Liang Song, Chuang Wang, Wenqing Wang
 doi: 10.19987/j.dzkxjz.2023-058
[Abstract](58) [FullText HTML](45) [PDF 3936KB](13)
By collecting focal mechanism solutions of earthquakes at different depths from Northeast Japan to Northeast China since 1957—2022, the joint iterative stress inversion method is used to calculate the tectonic stress field in the subduction zone and the tectonic stress field state in Northeast China. The results show that the shallow area of the Japan trench is not only affected by the subduction and extrusion of the Pacific plate, but also related to the extrusion of the North American plate. The deep source earthquakes in northeast China are closely related to the long-term action of the trench subduction zone. The formation of the Changbaishan volcanic area has a great relationship with the thrust of the subduction zone. The seismicity of the subduction zone indirectly controls the formation and activity of the volcanic area in Northeast Asia. The principal compressive stress axis is distributed in the NEE-SWW direction in the Yingkou area of Liaoning, while the principal tensile stress axis is distributed in the NNW-SSE direction. Based on the results of the focal mechanism of shallow earthquakes in the volcanic area and its surrounding areas, it is believed that the current tectonic stress field in the northeastern volcanic area continues the overall structure of stress in the northeastern region, with the principal compressive stress axis in the NEE-SWW direction and the principal tensile stress axis in the NNW-SSE direction.
Two Kinds of Earthquake Myths from Kingdom of Nanzhao
Gao Jizong
 doi: 10.19987/j.dzkxjz.2023-024
[Abstract](142) [FullText HTML](40) [PDF 2731KB](26)
Kingdom of Nanzhao (738— 902) has two kinds of earthquake myths. One is that a huge Ao ( legendary green sea-turtle) always topples the mountains and overturns the seas in Erhai Lake, and causes the people and animals devastated by the earthquake. Even though he blinks when wakes up, the earth will shake. So that there is an earthquake by every more than 70 years, and a big earthquake by every 400 years. Therefore people set up a seismic monument at Wanghaitai to warn the later generations of the earthquake damage. The other is that the River God of Erhai lake, Duan Chicheng, can predict earthquakes and keep people safe. Once Duan Chicheng predicts there will be a big earthquake at midnight, he cooperates with two Mountain Gods and East River Fisherman. Mountain Gods change themselves to a chicken and a dog, then crow loudly and jump hardly before the earthquake to warn people. East River Fisherman reports to the eastern villagers. River God of Erhai lake changes himself to an old man and reports to the western villagers. 90% villagers believe in them and leave houses to the flat ground, so people and domestic animals are safe. But the others not to believe in them suffers a lot damages.
Summary and consideration of the construction of the Haining cave topographic deformation platform
Zhong Wei, Fang Yanxun
 doi: 10.19987/j.dzkxjz.2023-006
[Abstract](45) [FullText HTML](29) [PDF 2323KB](7)
Haining Xiashi Seismic Station ((Cave topographic deformation observation Station) is located in the civil air defense cave in Xishan Park, Xiashi Street, Haining City, Zhejiang Province. During the construction of the station, the first problem is the poor quality of rock mass. When the tunnel is excavated to a depth of more than 2 m below the ground, the rock is still porous and broken; The second is the problem of high chamber humidity (>95% Rh). Finally, in the case that it is impossible to use rock pier to build the platform, the large area concrete instrument pier is poured and the cavern environment is transformed to reduce the humidity of the cavern, achieve thermal insulation and constant humidity, and improve the observation environment. So far, the station has been in operation for more than ten years. From the current situation, the observation data of the station is stable and continuous, and the solid tide is clear, which has achieved the expected effect of the station transformation. This paper summarizes the experience gained in the reconstruction process of Haining Xiashi Seismic Station, and provides reference for the construction of topographic deformation observation stations in some civil air defense and civil caves without rock piers.
Design and Implementation of Jiangsu Earthquake Emergency Contact Directory Based on Wechat Mini Program
Zhang Ting
 doi: 10.19987/j.dzkxjz.2023-035
[Abstract](54) [FullText HTML](43) [PDF 2235KB](6)
Obtaining disaster response feedback from the epicenter and surrounding areas in the shortest possible time is an important part of post-earthquake emergency work and the most important aspect of emergency decision-making. Work practice has shown that, compared to passively waiting for personnel to report, actively calling the affected areas is more conducive to quickly obtaining disaster information, thereby improving the efficiency of post-earthquake emergency response. Based on the advantage that government duty telephones have dedicated personnel on duty,this paper collects the data of government duty telephones and police station duty telephones in towns and streets of 13 cities in Jiangsu Province. Combined with the characteristics of light weight and easy operation of WeChat Mini Program, we designed and implemented a Jiangsu earthquake emergency contact directory. This program realizes real-time interactive inquiry of address book information, completes the function of quickly,accurately, and conveniently dialing calls, and also ensures the connection rate of the phone to a certain extent. At the same time, through the daily maintenance of the database,the instant availability of data is guaranteed. Compared with the traditional manual query method, it is more intuitive and efficient, and effectively reduces the time cost and process error in the post-earthquake emergency response process.
Earthquake Library Cited Reference Retrieve Service automatic System Construction Introduction and Thinking
Zhang Jinhui, Ma Xiudan
 doi: 10.19987/j.dzkxjz.2023-005
[Abstract](41) [FullText HTML](42) [PDF 2047KB](9)
The cited reference retrieve service is an important reference service carried out by the library of China Earthquake Administration for a long time. This paper introduces the concept and service process of the cited reference retrieve service, and then introduces the development situation and existing problems of the original cited reference retrieve service in the library of China Earthquake Administration, and leads to the construction of the automatic cited reference retrieve system. Then, the system architecture, software and hardware conditions, system configuration, service interface and main functions of the earthquake library cited reference retrieve system are introduced, and the construction experience is summarized, including improving the user experience by improving the reliability and customization of the report data, improving the work efficiency by improving the timeliness and accuracy of the report generation, and avoiding duplication of labor by improving the automation of the retrieval and indexing work. Finally, the next step is put forward.
Estimates for major funding applications for 2023 Japanese government earthquake research
Long HaiYun, Yan EnHui, Zhao Ping, Xu JiaJing, Li XiaoFan, Cui ManFeng
 doi: 10.19987/j.dzkxjz.2023-020
[Abstract](53) [FullText HTML](36) [PDF 1717KB](8)
According to the Japan Earthquake Disaster Prevention Measures Act, the Japan Earthquake Research and development headquarters (hereinafter referred to as the Japan earthquake headquarters) summarized, adjusted and published the proposed estimates for major funding applications for earthquake investigation and research by the relevant Japanese government administrative at the end of August 2022. In 2023, the government's estimated total budget for earthquake research is 10 billion yen, up 56% from 6.4 billion yen in 2022. These funds are mainly allocated to the Ministry of Education, Culture, Sports, Science and Technology, the Ministry of Economy, Trade and industry, the Ministry of Ministry of Land, Infrastructure, Transport and Tourism and the Ministry of General Affairs, which do not include the operating and maintenance expenses of Japanese public administrative legal persons, etc.
[FullText HTML](18) [PDF 2140KB](10)
Cao Yunjian and the Record of the Disaster of Caonan Earthquake
Gao Jizong
 doi: 10.19987/j.dzkxjz.2022-108
[Abstract](52) [FullText HTML](47) [PDF 6266KB](9)
Cao Yunjian (1882—1970) , also called Tieru , a native of Dingtao County, Shandong Province, lived in Heze. In the late Qing Dynasty and the Republic of China, he served as county magistrate, secretary and clerical official. In June 1952, he was hired as a librarian of Central Research Institute of Culture and History. ‘The Record of the Disaster of Caonan Earthquake’ details his personal experience during the Great Heze Earthquake of 1937, as well as his emergency and self-help measures after the earthquake, and what he saw and heard.The Heze Earthquake occurred after the outbreak of the War of Resistance Against Japan. The war has spread to the coastal areas of southern Hebei, Shandong and Jiangsu. Both the government and the people are unable to provide disaster relief. There is a serious lack of information about the earthquake and the disaster. “The Record of Cao” can make up for this, and can be called precious historical materials.
Display Method:
2023, 53(9).  
[PDF 11377KB](3)
Analysis on co-seismic response of underground fluids in Jiangsu related to Qinghai Maduo M7.4 earthquake
Ni Haoqi, Zhang Peng, Chen Hao, Wang Kai
2023, (9): 393-402.   doi: 10.19987/j.dzkxjz.2023-026
[Abstract](23) [FullText HTML](1) [PDF 3296KB](8)
This article collects the co-seismic response changes of the temperature and water level of Jiangsu fluid wells during the M7.4 earthquake in Maduo, Qinghai, summarizes their characteristics, analyzes the influencing factors in combination with the basic parameters of Jiangsu’s underground fluid wells and regional geological structures, and explores the changing mechanisms. The results show that the impact of the M7.4 earthquake in Maduo, Qinghai on underground fluids in Jiangsu was relatively significant, and the recording ability of the water level’s co-seismic response was better than that of the temperature. The temperature mainly showed step changes, while the water level mainly showed oscillations and step changes. The fluid wells that exhibited co-seismic response changes were mainly concentrated near the Tanlu fault zone and Maoshan fault zone. The regional and concentrated step changes in water level indicate that stress adjustment has occurred in the area, which has some indicative significance for the future occurrence of earthquakes. The co-seismic response mechanism of water temperature is more complicated. The movement mode and flow rate of water, wellbore conditions, and probe position may all affect its changes. More data is needed from various aspects to make a more accurate judgment.
Analysis of precursors and interference anomalies of digital observation data in Shuangwang well
Fang Yuan, Bai Xiangyu, Yang Kui, He Xin, Pan Cunying
2023, (9): 403-408.   doi: 10.19987/j.dzkxjz.2023-080
[Abstract](16) [FullText HTML](3) [PDF 2725KB](1)
In recent years, Shuangwang well in Weinan has accumulated a large number of accurate and reliable fluid observation data, but the data has not been systematically cleaned and analyzed. We systematically sorted the digital observation data of underground fluid in Shuangwang well from the date of digital observation start to the end of 2021 (1 June 2007 to 31 December 2021). Taking the interference and pre-earthquake anomaly observation data of water level and water temperature observation of Shuangwang well as the research object, the changes of digital observation data were analyzed, and the shape of the curve under the interference and pre-earthquake anomaly was analyzed. Analysis was carried out from the aspects of trend change characteristics, characters of earth tide, coseismic variations, preseismic anomalies and typical interference anomalies, and the change characteristics of the underground fluid data of Shuangwang well were researched, and the information reflected in the observational data were summarized and applied. It will provide scientific basis for the study of water temperature and water level anomalies and earthquake prediction in Weinan and its surrounding areas in the future.
Comparative analysis of observation data between DSQ water-tube tiltmeter and VS vertical pendulum tiltmeter at Ganzhou seismic center station in Jiangxi
Yu Si, Tang Tingting
2023, (9): 409-415.   doi: 10.19987/j.dzkxjz.2023-066
[Abstract](18) [FullText HTML](1) [PDF 2512KB](3)
Using the co-seismic response data from the DSQ water-tube tiltmeter and the VS vertical pendulum tiltmeter at the Ganzhou seismic center station in Jiangxi, we analyze the maximum response amplitude, the delay time and the continuous response time of the two instruments. The results show that: ① There is a positive correlation between the continuous response time and magnitude; ② There is a positive correlation between the delay time and epicenter distance; ③ Because of the differences of instruments design and observation principle, the recorded co-seismic response signals are different.
Study on characteristics of regional fault zone and surface temperature change in Xing’an League
Bao Baoxiao, Xi Wenya, Wang Zhiyong, Li Tengyu, Wang Hui, Jia Baojin
2023, (9): 416-422.   doi: 10.19987/j.dzkxjz.2023-051
[Abstract](17) [FullText HTML](2) [PDF 3423KB](0)
Based on Landsat 8 OLI/TIRS remote sensing images and the latest fault zone vector data, this paper analyzes and studies the characteristics of the regional fault zone and land surface temperature changes in the Xing’an League region. For the accuracy of land surface temperature inversion, the maximum likelihood classification algorithm is used to classify the surface objects, and then the radiative transfer equation algorithm is used to classify and retrieve the land surface temperature. The surface temperature inversion image and the fault zone structure image are superimposed on the same layer, and the average surface temperature and the average distance in each isozonal zone are calculated by using the method of equal interval segmented mean division, the change characteristics of surface temperature field in fault structure are shown by graph, and the relationship between fault zone and surface temperature field is further described by correlation curve. Finally, the remote sensing image data of the same month and different years are used to verify the results. The results show that the farther away the fault zone is from the Xing’an zone, the lower the surface temperature is, on the contrary, the closer the fault zone is, the higher the temperature.
Explore ways to guide all rural residents to participate in the popularization of earthquake prevention and disaster reduction
Li Xia, Zhang Fanghao
2023, (9): 423-428.   doi: 10.19987/j.dzkxjz.2022-176
[Abstract](53) [FullText HTML](36) [PDF 2132KB](4)
The probability of earthquake occurring in rural areas is greater than that in urban areas, and rural residents’ awareness of earthquake prevention and disaster reduction is relatively low. Affected by subjective and objective factors, rural areas are prone to property losses and casualties due to earthquake disasters. Based on the sample survey of Midu County, Dali Prefecture, Yunnan Province, this paper analyzes the rural residents’ demand for earthquake prevention and disaster reduction publicity and their willingness to participate in the popularization of earthquake prevention and disaster reduction as the main body, and explores the ways and approaches for the rural residents to participate in the popularization of earthquake prevention and disaster reduction. The analysis shows that under the continuous efforts of traditional media and emerging media, most villagers have been exposed to earthquake knowledge, and they prefer various forms, strong practicability, local characteristics, simple, quick and easy to understand the publicity methods of acquiring knowledge. However, due to the influence of activity information transmission, villagers’ education level, occupation, ability, interest, time and other factors, villagers are not willing to participate in the popularization of earthquake prevention and disaster reduction, and the simple way of implementation and strong incentive method are relatively popular. By increasing the benefits of participation, reducing the cost of participation, and facilitating the flow of information, the participation of all rural residents in the popularization of earthquake preparedness and disaster reduction can be gradually realized.
Refiections and countermeasures on the operation and maintenance management of geophysical station networks in Xinjiang
Wang Bin, Yan Long, Zhuo Ruiqi, Wang Xiaofei, Yasen• Aosiman
2023, (9): 429-436.   doi: 10.19987/j.dzkxjz.2023-013
[Abstract](52) [FullText HTML](18) [PDF 2530KB](8)
As the institutional reform of China’s seismic system and the “14th Five-Year” plan continue to advance, the layout of seismic scientific instruments in the Earthquake Agency of Xinjiang Uygur Autonomous Region has become more dense, digitalized and modernized. As a grassroots central station, the number of instruments that need to be maintained is increasing, and the technical requirements for instrument management and maintenance and the pressure of operation and maintenance are increasing. The geophysical station network, as a frontline position for observing and studying crustal motion and deformation processes, identifying strong earthquake breeding stages and exploring strong earthquake prediction, has a direct impact on the quality of data output and thus on data analysis results and earthquake breeding identification. Therefore, in this paper, we propose some suggestions to improve the efficiency of instrument operation and maintenance for the current situation and problems of the geophysical station network management and maintenance between the operation and maintenance office of Xinjiang geophysical observation center and the central station through literature analysis and interview method.
Crustal movements detected by GPS observations before and after the India Ocean earthquake of M9.3 in 2004 and other earthquakes
Gu Guohua, Wang Wuxing
2023, (9): 437-448.   doi: 10.19987/j.dzkxjz.2022-158
[Abstract](62) [FullText HTML](20) [PDF 4647KB](18)
From 2004 to 2012, multiple strong earthquakes occurred in the western offshore of Indonesia and among them the Indian Ocean earthquake of M9.3 in 2004 has been the greatest in this century in the world. Based on the time series of coordinates at 35 stations of continuous GPS observations in Indonesia and its neighborhood in the global reference frame, the accumulated preseismic, coseismic and post seismic displacements, particularly the accumulated preseismic horizontal displacements and the coseismic horizontal displacements of these earthquakes in the regional reference frame with the core station at BJFS near Beijing on China mainland, are obtained. The crustal movements in the region has been quite complicated as shown by significant mutual influences in the crustal movements that were related at the GPS observation stations because of strong earthquakes of short time intervals and short spacing, scattering over a large area. The features, causes and mutual influences of the preseismic, coseismic and postseismic crustal movements of 5 earthquakes of magnitudes over M8.0 are discussed. Results of GPS observations show that the coseismic horizontal displacements of earthquakes of magnitudes larger than M7.5 were (elastic) rebound of the accumulated preseismic horizontal displacements, which were precursory to the earthquakes. The M9.3 in 2004 and M8.7 in 2005 were close in magnitudes. Occurrence time and spacing and the areas of anomalous crustal deformations in the preparation of both events were both overlapping and non overlapping, which was the prerequisite for the triggering of the latter by the former event. The intensive post seismic horizontal crustal movements of the M9.3 and M8.7 earthquakes significantly contributed to the occurrence of the M8.6 and M8.2 earthquakes in 2012. Though the occurrence of the M8.4 earthquake in 2007 was independent of the M9.3 and M8.7 earthquakes, the postseismic horizontal crustal movements of the M8.4 influenced the coseismic horizontal displacements of the M8.6 and M8.2 earthquakes, south to the equator. Though stations of continuous GPS observations used in this study is small in number and low in density, they have accumulated valuable earthquake cases of complicated crustal deformations before and after multiple strong earthquakes with GPS observations for the benefit of exploring earthquake predictions. The study shows that the western part of Indonesia is one of the most valuable areas for the exploration of earthquake predictions in the world.
Supported by: Beijing Renhe Information Technology Co., Ltd. 百度统计