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ISSN 2096-7780 CN 10-1665/P

Articles in press have been peer-reviewed and accepted, which are not yet assigned to volumes /issues, but are citable by Digital Object Identifier (DOI).
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Analysis of that influence of the observation mode of seismic station on the background noise
Yang Yayun, Wang Jian, Fu Zhuo, Zhang Xun
 doi: 10.19987/j.dzkxjz.2022-152
[Abstract](0) [FullText HTML](0) [PDF 5483KB](0)
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Three seismic stations in Chongqing area have been reconstructed, the type of station base is changed from deep pit observation to surface observation. The PSD and the PDF of the three stations before and after reconstruction were calculated respectively, the noise power spectrum is used to average the noise curve to evaluate the background noise variation of the three stations. The calculation results show that, excluding the impact of the epidemic situation of COVID-19 epidemic, the environmental noise level of the three reconstructed stations still increased, pecially in frequency bands above 2 Hz. The maximum increase of YUM Station is 9 dB, LIJ Station in is 10 dB, and SHG Station is 4 dB. But the overall environmental noise level between 1—20 Hz bands of the three stations still meets the requirements of the observation specifications. However, after changing the observation mode of the station base, the components of the noise signal received by the station change significantly, especially the human activity related noise, so when carry out the construction and reconstruction of seismic stations, it is necessary to carefully change the observation mode of the station base.
Typical interference analysis of FHD-2B observation data at Datong seismic station
Hao Xuejing, Han Sheng, Gao Longfei, Liu Wei
 doi: 10.19987/j.dzkxjz.2022-157
[Abstract](0) [FullText HTML](0) [PDF 5095KB](0)
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The geomagnetic observation data of FHD-2B at Datong seismic station in Shanxi is mainly affected by the interference of the instrument's own observation system and the surrounding environment. Since the performance of the instrument is nearly stable after delivery, we can improve the quality of observation data by improving the environment. In this paper, the quality of observation data from 2017 to 2021 is evaluated from three aspects: continuity rate, integrity rate and background noise, and it is found that the background noise level of the instrument has been significantly reduced since the instrument was updated in June 2019. By analyzing the data curves of different interferences such as construction interference, vehicle interference, high-voltage direct current transmission interference and power failure, it is found that the construction interference is generally manifested in the same period of time when each component is interfered, and the interference amplitude is different; The interference of high-voltage direct current transmission is usually serious in Z component, which can be processed through the interference period given by the National Geomagnetic Network Center and combined with the data of surrounding geomagnetic stations; Vehicle interference interferes with each component of data, corresponding to vehicle activity period; The power failure interference shows that the observed data curves of D, H and Z components become thicker, burrs increase, and even wrong data appear, which can be solved by modifying the parameters of the instrument home page. The characteristics of different interference curves are summarized, which is convenient for workers to use FHD-2B geomagnetic data correctly for seismic research.
Analysis of accuracy index in fixed-point deformation observation data of Wuzhishan station
Guo Yuqin, Zeng Tao, Yang Shijie, Li Dongya
 doi: 10.19987/j.dzkxjz.2022-093
[Abstract](7) [FullText HTML](6) [PDF 3064KB](1)
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This paper presents a statistical analysis of the internal accuracy of the fixed-point deformation observation data of the Wuzhi Mountain deformation station from January to December 2016. The internal accuracy of the station's water pipe tiltmeter and indium tile rod extensometer is better than that of the other 2021 The probability that the inherent precision of the two components of the broadband tiltmeter reaches the excellent index is only 50%. Since January 2020, the inherent precision quality of the observation data has been decreasing, which leads to the low quality of the observation data. It is considered that improving the intrinsic high quality of data is to ensure the continuous rate of observation data. Therefore, it is urgent to improve the operational level of station personnel and to ensure the necessary spare parts.
Example analysis of water pipe inclinometer observation affected by reservoir load
Zhang Na, Gong Yanmin, Wang Yan
 doi: 10.19987/j.dzkxjz.2022-146
[Abstract](7) [FullText HTML](5) [PDF 3467KB](0)
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The curve of DSQ water tube tiltmeter NE at Yixian Seismostation in Hebei Province has a downward trend since February 14, 2022. The annual change curve is different from that of previous years. Combined with the simulation results of three-dimensional concentrated load model, it is shown that the total reservoir capacity of Wanglong Reservoir will reach 279.50×104 m3 from February 14 to April 6, 2022. The theoretical value of tilt change is 1.27×10−7 , which is higher than the limit index of tilt interference of 1.455×10−8 is the main factor causing the abnormal change of NE component acceleration of water tube instrument at Yixian Station.
Research on earthquake emergency rapid response system based on python and Tianditu: A case study of Jiangsu
Yu Qipeng, Dong Jianping
 doi: 10.19987/j.dzkxjz.2022-139
[Abstract](4) [FullText HTML](4) [PDF 5454KB](0)
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In order to improve the ability of earthquake emergency response, it is convenient to quickly obtain earthquake affected fields, earthquake emergency thematic maps and rapid assessment reports after the earthquake, and the research can provide professional technical support for earthquake emergency decision-making and rescue. The research develops a visual form through QT, uses the Sky Map API to call the Sky Map as the base map, and the Sky Map inverse geographic service API obtains basic geographic information, and finally superimposes the earthquake thematic data. After the user enters the epicenter latitude and longitude coordinates and other information, the arcpy library automatically creates earthquake thematic maps of the epicenter area in batches, and uses the python-docx library to automatically generate a quick assessment report. The practical application results show that after the python script is encapsulated, the system program has only one single file, which can be copied and used immediately, making deployment simple, mass production of thematic maps, automatic production of earthquake briefings, etc., which significantly improves emergency efficiency and improves the level of earthquake emergency informatization services. made significant progress.
Investigation and countermeasure research on seismic fortification of rural residential buildings in Linyi, Shandong
Cheng shuqi, Wang Xibao, Han Bing, Li Meng, Lü Hao
 doi: 10.19987/j.dzkxjz.2022-075
[Abstract](5) [FullText HTML](5) [PDF 7069KB](0)
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This paper goes deep into the rural areas of Linyi, carries out a special investigation on the seismic fortification of rural houses, points out the problem of insufficient seismic fortification of rural houses in Linyi, analyzes the causes of insufficient seismic fortification of rural houses, and puts forward countermeasures and suggestions.
Correlations between physical and mechanical property indexes of Shanghai soil using support vector machine
Li Zhiguo, Bai Ruihan, Liu Xujin, Wang Shumao
 doi: 10.19987/j.dzkxjz.2022-166
[Abstract](10) [FullText HTML](7) [PDF 3835KB](0)
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Correlation analysis of physical and mechanical indexes of Shanghai soil was carried out. By using the support vector machine algorithm, the authors constructed a correlation analysis model of soil plasticity index, liquidity index and compressibility coefficient based on the soil indoor test data obtained from several engineering sites. Then optimize the model parameters by combining the error index. Compared the results of support vector machine model with those of traditional linear and polynomial fitting methods, the results show that, the prediction results of the model are basically consistent with the actual results, and the another advantage of model is that more data to could be mined deeply to improve its robustness. Consider the engineering properties of different category soils are quite different, the author further analyze the performance and applicability of model, given on error of each testing sample with its corresponding physical index, establish the relationship curve between them, the results indicate that the error of medium compressible soil is smaller than high compressible soil, and model is more stable and accurate, this could provide reference for the research of soil compressibility in Shanghai other areas.
An excellent art painting in seismology-In memory of Mr. Wu Guanying
Feng Rui
 doi: 10.19987/j.dzkxjz.2022-182
[FullText HTML](8) [PDF 5113KB](0)
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Dealing with network fault in operation and maintenance of seismograph-case analysis
Zhang Weifeng, Pan Jie, Sun Liangliang, Fan Dong
 doi: 10.19987/j.dzkxjz.2022-149
[Abstract](15) [FullText HTML](10) [PDF 1935KB](1)
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In order to ensure the continuous and reliable observation data of seismic stations, improve the operation rate of seismic stations, it is very important for the seismic monitoring center station to take charge of the operation and maintenance of the station and network in its area. In this paper, through the daily operation of the process met Analysis and disposal of a case of station network fault, This paper expounds how to find the basic working ideas and operation methods in the process of operation and maintenance of the instrument, To provide some experience for the colleagues who are in charge of the operation and maintenance of the instruments in the seismic monitoring center station.
Determination of focal depth of earthquakes with M≥2.5 in Jiaokou reservoir area in 2019 by various methods
Peng Xiao, Zhang Beilei
 doi: 10.19987/j.dzkxjz.2022-070
[Abstract](27) [FullText HTML](18) [PDF 4019KB](7)
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In this paper, the focal depth of earthquakes with magnitude 2.5 or above in Jiaokou reservoir area in 2019 was determined by using the CAP method, the sPL depth phase method and the double difference positioning method. ① The inversion is carried out by CAP method to calculate the optimal focal mechanism solution and focal depth; ② The clear sPL seismic phase is identified at the near station about 50 km away from the epicenter, the theoretical waveform of various focal depths is drawn by using the frequency wave velocity (F-K) method, and the focal depth is determined by fitting with the actual waveform; ③ The seismic event pair is established, and its relative position and depth are determined by using the residual between the observed value and the theoretical value of travel time difference. The results of various methods are basically the same. In contrast, the double difference positioning method is more suitable for the determination of the seismic focal depth in Jiaokou reservoir area.
Analysis on Non-tectonic Origin of Linear Scarps in Alluvial-proluvial Fan of the West Bank of Xidong in Hexi Corridor
Zheng Rongying, Chen Baixu, Zhou Wenjie, Yang Chenshuang
 doi: 10.19987/j.dzkxjz.2022-113
[Abstract](53) [FullText HTML](13) [PDF 13525KB](7)
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The formation and discovery of linear scarps in alluvial-proluvial fan are affected by many factors, such as structure, erosion and human activities. In this paper, combined with the UAV high resolution remote sensing image interpretation, the topographic and the geomorphological profile analysis, the trench excavation, the engineering geological profile analysis and the audio magnetotelluric detection etc., we analyzed comprehensively the landform of the linear scarp developed in the alluvial-proluvial fan of the west bank of Xidon in Hexi Corridor from the shallow layer to the deep layer. The conclusions are as follows: the topographic and geomorphological profile indicates that the terrain elevation on both sides of the linear scarp is turning gradually flat without deformation; The trench reveals that the underlying strata on both sides of the linear scarp are continuous, and the bottom strata are nearly horizontal with the occurrence being significantly less than the top strata and there is no stratigraphic fault; The engineering geological section shows that the top surface of Q3 alluvial-proluvial sandy gravel layer on both sides of the linear scarp is continuous, and there is no formation dislocation; The audio magnetotelluric detection results show that the underlying bedrock interface on both sides of the linear scarp is continuous and complete, with no sign of fault passing. Therefore, it is concluded that the linear scarp landform developed in the alluvial-proluvial fan of the west bank of Xidong in Hexi Corridor is formed bynot the tectonic effect rather than the lateral erosion of the Daciyao River.
Research and application of off-line earthquake disaster rapid assessment and emergency mapping system
Tan Qingquan
 doi: 10.19987/j.dzkxjz.2022-016
[Abstract](63) [FullText HTML](38) [PDF 2441KB](9)
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Rapid loss assessment and emergency mapping play an extremely important role in post-earthquake emergency work. Taking the Beijing-Tianjin-Hebei region as an example, this research studied and implemented a novel and practical rapid assessment and mapping technology. Based on off-line data and self-developed software modules, the rapid loss assessment and professional mapping representation could be easily realized. Firstly, the basic geographic data and important earthquake-related data of the Beijing-Tianjin-Hebei region were updated and processed, and the multi-level pre-cached off-line map data was produced based on the principle of LOD (Level of Details) model. Secondly, based on advanced sub-area classification evaluation model and calculation method, the kilometer grid data of earthquake disaster losses under different intensities were generated. Subsequently, an efficient off-line storage management mechanism based on geographical partitions was implemented, for large amounts of off-line map data and pre-assessed loss kilometer grid data. Finally, based on object-oriented programming and graphic image processing technology, the integrated application software for rapid loss assessment and professional mapping representation was designed, developed and implemented. This research has realized the key technologies of the whole chain, and does not rely on any third-party commercial software or service plug-ins. The rapid assessment reports and series of maps can be automatically generated within one minute. The research results have achieved novel practical effectiveness in multiple earthquake events. This research is of great significance for improving the ability of earthquake emergency response.
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
 doi: 10.19987/j.dzkxjz.2022-158
[Abstract](14) [FullText HTML](10) [PDF 4416KB](3)
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From 2004 to 2012, multiple strong earthquakes occurred offshore western part 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 8.0 are discussed. Results of GPS observations show that the coseismic horizontal displacements of earthquakes of magnitudes larger than 7.5 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 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.
Quaternary activity and seismic hazard of Liangyun fault in northwestern Hubei area
Cui Min, Zheng Rongying, You Jiajing, Zhao Qian
 doi: 10.19987/j.dzkxjz.2022-141
[Abstract](42) [FullText HTML](25) [PDF 10800KB](6)
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The Liangyun fault zone, as one of the largest and most influential faults in the northwestern Hubei area, is located in the uplifted area of Qinling fault block with a length of about 200 km. The structure has a sinistral strike-slip motion with obvious quaternary activities. The Yunxi M4.9 earthquake occurred in 1964 may be resulted from the reactivation of the Liangyuan fault. However, the Quaternary activity of the fault is poorly studied, which affects the overall understanding of the neotectonic deformation pattern and strong earthquake risk in the western Hubei area. Based on remote sensing interpretation, field investigation, and high-density electrical exploration, it was found that bead-like basins, negative fault long valleys, fault passes, fault scarps, and other morphological features are developed along the fault trace. The fault activity is obvious in the early and middle Quaternary sediments. The risk of moderate earthquake in the future should not be underestimated, although its activity in the late Quaternary is weak.
Analysis of typhoon disturbance characteristics recorded by broadband tiltmeter at Huangmei station
Zhang Ping, Lü Pinji, Liu Ke, Temu Qile, Li Yin, Zhang Yimei
 doi: 10.19987/j.dzkxjz.2022-147
[Abstract](15) [FullText HTML](8) [PDF 2629KB](0)
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The continuous observation data recorded by the broadband vertical pendulum tiltmeter at Huangmei Station during the typhoons “BAVI” and “IN-FA” periods were studied. Wavelet decomposition and Fourier transform were used to investigate the disturbance and spectrum characteristics of the microseism signal caused by the typhoon. The results show that the disturbance amplitude has an increase-peak-decrease pattern during the process of typhoon, and has a good correlation with the speed of typhoon and the distance between the typhoon center and the station. The dominant frequency of the microseism caused by the typhoon range from 0.13 to 0.3 Hz, and the corresponding period is 3.3 to 7.7 s.
The new development direction of seismic gravity observation technology: integrated measuring of absolute gravity and vertical gravity gradient
Wu Qiong, Xu Jiansheng
 doi: 10.19987/j.dzkxjz.2022-066
[Abstract](27) [FullText HTML](7) [PDF 3034KB](6)
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The integrated and array observation of the high-precision absolute gravity and gravity gradient can effectively improve the identification accuracy of gravity field sources at different depths. Based on the shortcomings and development direction of absolute gravity observation technology in the "China Geophysical Station Network (Gravity) Planning (2020—2030)" issued by the China Earthquake Administration, this paper proposes the observation technology idea of the integration of absolute gravity and gravity gradient. By monitoring and discovering the microgravity change signals caused by the transport of shell-mantle hot materials during the incubation of strong earthquakes, the ability to predict medium-term, short-term and near-earthquakes of destructive earthquakes is improved. Further expand the application of absolute gravity control capabilities of gravity station networks, and explore new development directions of gravity observation technology for professional seismic stations in China.
Design of groundwater level prediction system based on BP neural network
Liao Shaohuan, Zhao Naiqian, Zhan Xu
 doi: 10.19987/j.dzkxjz.2022-118
[Abstract](16) [FullText HTML](14) [PDF 3695KB](5)
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In order to understand the dynamic of groundwater level and master the earthquake precursor dynamic, this paper studies the prediction algorithm based on BP neural network. According to the groundwater level of Deyang, Sichuan province, SWY-II digital water level meter is used to collect the groundwater level data of Deyang. Groundwater table data for 2015 have been collected. In this paper, based on the collected water level data, the BP neural network is used to predict the change of groundwater level, and the data collected for one year are trained and tested. The structure of BP neural network is designed with three input nodes and one output node. In order to further validate the proposal, the groundwater level from mid-July to late October 2017 is predicted.The experiment shows that the scheme can predict groundwater level effectively and provides reliable data for earthquake precursor work.
Analysis of the interference of Quanzhou seismac station g-Phone gravimeter oberservation data
Chen Shanhua, Cai Peirui, Chen Xinxing, Xie Wenjie, Wang Jianxin
 doi: 10.19987/j.dzkxjz.2022-122
[Abstract](24) [FullText HTML](17) [PDF 4822KB](2)
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Summed up the interference factors of Quanzhou seismic station g-phone gravimeter observation data. It is considered that the change of working state and the influence of meteorological factors are the main interference factors. The change of the internal temperature of the instrument has a great influence on the data, so it is necessary to avoid the change of the internal temperature caused by manual operation such as power failure. The rainfall and the change of air pressure caused by typhoons increased the noise of the data.
Analysis and research on the quality of observation data of Zhaotong Xunlong seismograph
Ma Minwei, Li Gang, Peng Dengjing, Qin Bo, Zhang Hongtao, Ma Da
 doi: 10.19987/j.dzkxjz.2022-119
[Abstract](13) [FullText HTML](10) [PDF 2978KB](1)
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Based on the quality evaluation results of the national seismic stations from 2018 to 2021 at the Zhaotong Xunlong Seismographic Station, by analyzing the deduction of points and the reasons for the problems over the years, combined with the actual situation of the station, the improvement data analysis is given. The corresponding experience and technical countermeasures in aspects such as level and strengthening system operation ability. In order to improve the quality of seismic observations at the Zhaotong Xunlong Seismic Station in a targeted and planned way in the future, it provides a basis to follow, and has guiding significance and reference significance for the improvement of the quality of the seismic observation data of this station and its brother stations.
Reliability analysis and influence comparison of special events of component strain and volume strain at Dongping seismic station
Xu Fangfang, Zhu Chenglin, Jia Yuan, Lu Shuangling
 doi: 10.19987/j.dzkxjz.2022-080
[Abstract](20) [FullText HTML](19) [PDF 3898KB](2)
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In this paper, the reliability analysis of the YRY-4 borehole component strain observation data at Dongping Seismic Station is carried out through the four-component self-check and the relative calibration internal accuracy analysis, and the data of the two instruments are compared by combining the sliding correlation calculation and the internal accuracy of the tidal factor. It is proved that the two surface strain correlation of the YRY-4 borehole component strain is high, and the correlation coefficient is close to 1. The relative calibration internal accuracy is high, which is consistent with the overall trend of the volume strain data. The observation environment of the two instruments is consistent, and the operation is stable, the data are normal and reliable. However, there are also inconsistencies in the curves of rainfall and site interference in special periods. For the two special cases, compared by correlation calculation and S transform.The results show that, due to the large difference in drilling conditions, the correlation between the two instrument data during rainfall period is poor, close to 0. During the site interference period, the two observation systems were affected, and the interference signals appeared synchronously in the frequency domain, which affected the data curve shape and the accuracy of the tidal factor, but the strain correlation between the two instruments reached 0.91 during the interference period.Comprehensive analysis shows that the two sets of instrument observation systems of Component strain and Volume strain at Dongping seismic station are reliable and stable.
Reform status analysis and path optimization of yunnan earthquake monitoring center station
Zhao Zhirou, Zhuang Yan, Wu Yanmei, Li Zhen
 doi: 10.19987/j.dzkxjz.2022-125
[Abstract](24) [FullText HTML](21) [PDF 2890KB](3)
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The earthquake monitoring center station is the basic unit of the earthquake monitoring system. In the face of the new situation of reform and development and the establishment of a comprehensive emergency disaster relief system, in order to better meet the needs of the earthquake monitoring work in the development of earthquake prevention and disaster reduction in the new era, the Yunnan Provincial Earthquake Administration completed the listing of the provincial earthquake monitoring center station at the end of September 2021, and determined the organization setting, function division and staffing of the center station. By reviewing the reform process of the Yunnan Earthquake Monitoring Center Station, this paper analyzes the current situation of the Yunnan Earthquake Monitoring Center Station reform and combines the existing deficiencies, and puts forward corresponding optimization suggestions for the future development path. This is of great significance for improving the monitoring and forecasting capability and modernization level of the central station, strengthening and standardizing the management of earthquake stations in Yunnan, and giving full play to the basic role of the earthquake monitoring center in the development of earthquake prevention and disaster reduction in the province.
Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes
Zhang Beilei, Peng Xiao
 doi: 10.19987/j.dzkxjz.2022-110
[Abstract](30) [FullText HTML](18) [PDF 4653KB](4)
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The earthquake of Jiaokou reservoir in Ningbo from 2009 to 2021 was relocated by using the double difference positioning method. The focal mechanism solution of large earthquakes was calculated by hash method. Based on the location distribution, depth distribution and overall focal mechanism solution characteristics of the earthquake after precise positioning, the seismogenic structure and seismogenic mechanism were discussed in combination with the regional geological tectonic background, geological conditions in the reservoir area and the change of reservoir water level. The results show that the seismogenic mechanism of the Jiaokou reservoir earthquake sequence in 2009—2012 is similar to that in 2018—2021, and the regional fault Changxing Fenghua may be the seismogenic fault; The reservoir water infiltrates through the fracture fracture zone, the pore water pressure diffuses ,the reservoir water softens and weakens the rock for a long time, causing the fault plane and some weak parts in the deep part to become unstable areas, and finally triggering the earthquake under the loading and unloading stress field caused by the change of reservoir water.
Characteristic analysis and forecasting effectiveness of Akesu fault hydrogen anomalies for moderate-strong earthquakes
LIU Haiyang, XU Yangang, ZULIKAER· Aizezi, JIANG Zhiying
 doi: 10.19987/j.dzkxjz.2022-111
[Abstract](33) [FullText HTML](17) [PDF 2983KB](4)
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There were multiple moderate-strong earthquakes occurred successively within an area in 300 km around the Aksu fault hydrogen observation point in the period from November 2013 to December 2021, for which 8 short-term precursory anomalies of fault hydrogen concentrations appeared in different degrees change. By analyzing and summarizing the abnormal characteristics, the obtained earthquake cases are divided into three different types: fluctuation type, sudden rise type and sudden rise recovery type. Using the scoring method of R value to evaluate the prediction efficiency of the Aksu fault hydrogen observation, R value score of 0.462 has been obtained for earthquakes with magnitude above 5 within a range of 300 km, and the prediction efficiency is good.
Determination of north-south Anomaly of water pipe tiltmeter at Wuzhishan station
Guo Yuqin, Li Sheng, Zhang Hui, Hu Jiuchang, Sun Sanjian
 doi: 10.19987/j.dzkxjz.2022-077
[Abstract](15) [FullText HTML](10) [PDF 7608KB](0)
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The north-south component of the DSQ water pipe tiltmeter at Wuzhi Mountain seismic station has been tilting southward continuously since May 2017. Based on the field investigation of the deformation observation system of the Wuzhi Mountain Seismic Station, the temperature of the cavern, the auxiliary observation data and the changes of the surrounding environment factors, etc. , based on the evaluation and analysis of the quality of the ground tilt observation data, the comparison of the observation data of other tilt instruments in the same seismic station, and the recognition of digital precursory anomalies, it is concluded that, the South Tilt of DSQ water pipe tiltmeter at Wuzhi Mountain seismic station may be related to the coupling characteristics of the instrument and the performance of the instrument itself.
A method to estimate the microseismic magnitude based on vector scanning
Feng Yanjun, Liang Beiyuan
 doi: 10.19987/j.dzkxjz.2022-072
[Abstract](15) [FullText HTML](12) [PDF 1813KB](4)
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One can estimate the magnitude of a seismic event, recorded with ≥1 ratio of signal over noise (S/N), by measuring seismic energy, seismic moment, and relationship between the energy and seismic magnitude (M), etc. It is impossible, however, to traditionally locate a microseismic quake, including determining its magnitude, because of its records, most of the cases, with smaller amplitudes than those of background noise. For comparing the microseismic magnitudes at different regions and with different causes, studying their mechanisms, etc. we first extend the definition of Richter magnitude to the microseismic range. Then, based on the scanning output of minimum S/N in the available vector-processing for microseismic monitoring, we estimate their equivalent Richter magnitude. The microseismic magnitudes induced by different causes are compared.
Cao Yunjian and the Record of the Disaster of Caonan Earthquake
Gao Jizong
 doi: 10.19987/j.dzkxjz.2022-108
[Abstract](18) [FullText HTML](23) [PDF 6266KB](2)
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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.
The National Earthquake Hazards Reduction Program:Issues in Brief
Zhang Jinhui, Gao Xiaoyue, Cui Manfeng
 doi: 10.19987/j.dzkxjz.2022-074
[Abstract](55) [FullText HTML](78) [PDF 1864KB](10)
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The National Earthquake Hazards Reduction Program (NEHRP) is a national program to improve the seismic safety of urban buildings and lifeline projects. On December 21, 2021, the Congressional Research Service (CRS) released a report entitled “The National Earthquake Hazards Reduction Program (NEHRP): Issues in Brief”. The report reviews the development of the National Earthquake Hazards Reduction Program (NEHRP) since it was implemented by the U.S. Congress in 1997, and the main problems that congress faces in continuing it. This paper introduces the main contents of the report, provides policy reference for timely understanding of earthquake disaster reduction in the United States, and has important reference value for earthquake industry and related disaster reduction research.
Prediction and prevention of three historical earthquake in Dali
Gao Jizong
 doi: 10.19987/j.dzkxjz.2021-104
[Abstract](148) [FullText HTML](330) [PDF 2104KB](8)
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Note-taking articles, Sanyi Sketch, Huaicheng Night Talk, and Yeyu Unofficial History, are contained in the book of Some Lost Ancient Books in Dali. They describe that Mr. Fa Rui, Mr. Guang Ming and Mr. Yang Jinghao had predicted and prevented earthquakes in Dali in the year of 779, 1111 and 1341, just according some macroscopic anomalies. The earthquake with more macroscopic precursor phenomena can be predicted, forecasted and prevented. However, it is necessary to strengthen the research on the mechanism of macro-precursors, to reveal the physical essence of macroscopic precursor phenomena, to produce a high-sensitivity, high-resolution and high-precision earthquake precursor monitoring instrument which can effectively catch the macro-precursor phenomena before earthquakes, to carefully design and place on the monitoring grid points. Then we can achieve real-time the continuously-monitored various signals which are sented through the network to the earthquake monitoring center, analyse the signals by high-speed computer networks and cloud platforms, and collect reliable earthquake precursor information. Finally, the earthquake prediction, forecast and prevention is expected to achieve with the modern earthquake monitoring network.
Some strategies for improving public services of earthquake prevention and disaster mitigation in Gansu Province
Zhang Guangping, He Lijun
 doi: 10.19987/j.dzkxjz.2022-067
[Abstract](30) [FullText HTML](36) [PDF 1678KB](4)
Abstract:
In the new era, with the rapid development of economy and society of China, the public develops a higher demand for public safety, personal safety, property safety and environmental safety, including a demand for a high-quality and high-efficiency service of earthquake prevention and disaster mitigation. This paper reviews basic concepts about the public services concerning earthquake prevention and disaster mitigation, analyzes the current status of such services at the national and provincial levels, respectively, and presents some strategies on how to improve these services.
Noise Fault Analysis of FHD Proton Vector Magnetometer ——Take Suqian geomagnetic station as an example
Peng Peng, Sun Yujie, Zhang Rongshan, Zhang Peng, Xia Zhong
 doi: 10.19987/j.dzkxjz.2022-059
[Abstract](59) [FullText HTML](40) [PDF 2413KB](7)
Abstract:
This paper, we analyzed the noise increase problem of FHD proton vector magnetometer’s observation data at Suqian station from April 28, 2020. After we checked through and analyzed the instrument parameter settings, observation environment, instrument and operation conditions, the failure of FHD instrument is confirmed. The capacitor in the instrument compensation current circuit is broken down due to aging, and we solved the problem by replacing the faulty capacitor. After the repairmen, the calculated background noise of magnetic declination D, horizontal component H and vertical component Z decreased from 1.19 ′, 1.45 nT, 1.58 nT to 0.82 ′, 0.32 nT, 0.50 nT, the noise quality of each component has been significantly improved. We examine、detect and judge the classification of geomagnetic instrument and observation environment, and we summarize the reasons for the noise fault. This paper provides a scientific and effective detection method for geomagnetic stations to find and analyze the main reason for the data noise problems.
Analysis of influence of standby sampling points on observation of radon in water at Hanzhong seismic station
Zhu Xuanming, Yan Wenhua, Ma Sihang
 doi: 10.19987/j.dzkxjz.2022-126
[Abstract](23) [FullText HTML](20) [PDF 2188KB](5)
Abstract:
In this paper, two water radon sampling points at Hanzhong seismic station are taken as experimental objects. Through comparative observation, the radon value and water temperature on the same day at the main and standby sampling points are obtained, and the reasons for the difference are analyzed. It is shown that the observation results at the standby sampling points will have a direct impact on the water radon observation at this station, increasing the uncertainty of data analysis and affecting the continuity of observation results.
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2023, (1).  
[PDF 11321KB](2)
Abstract:
Research on disaster convergence and decision-making service technology of full-time earthquake emergency
Liu Qin, Jiang Lixin, Shuai Xianghua, Nie Gaozhong, Chen Weifeng, Zhang Peng, Che Ailan
2023, (1): 1-10.   doi: 10.19987/j.dzkxjz.2022-002
[Abstract](110) [FullText HTML](62) [PDF 3045KB](19)
Abstract:
In view of the scientific problems such as the difficulty of predicting the disaster before the earthquake, the slow and fragmented acquisition of disaster information after the earthquake, the large error of disaster assessment, the lack of decision support and the absence of disaster services, considering comprehensively pre-earthquake emergency preparedness and post-earthquake emergency response scenarios, this research focuses on the information acquisition and analysis methods of full-time disaster and decision-making, real-time convergence and fusion technology of disaster after earthquake, post-earthquake loss comprehensive analysis technique based on the combination of lethality and vulnerability, key points of assistant decision support for different regions, visualization generation technology for multi-user disaster information service product, establishing a disaster situation push and information quasi-real-time service platform and terminals, constructing the intelligent and visual earthquake emergency information whole process service platform based on cloud architecture, and carrying out emergency collaborative service demonstration, to realize the full-time service of disaster information for large earthquakes with magnitude above 7. The project enriches the means of obtaining earthquake disaster information and forms a technical platform of the whole process of earthquake emergency response, including disaster collection, information flash, monitoring and early warning, analysis and evaluation, intelligent coordination and dynamic release. It is of great significance to improve the ability of earthquake emergency information service for quick and scientific rescue.
Peak adjustment method of input seismic wave in time history analysis of long-span cable-stayed bridge
Li Xiaoli, Li Xiaoshuang
2023, (1): 11-20.   doi: 10.19987/j.dzkxjz.2022-061
[Abstract](79) [FullText HTML](26) [PDF 2591KB](11)
Abstract:
The peak adjustment of seismic wave is often realized by the method based on the peak ground acceleration (PGA), while the peak acceleration of the design response spectrum in the current specification is the effective peak acceleration (EPA), and EPA is recommended for peak adjustment. Firstly, the meaning and internal relations of PGA and EPA were analyzed, and the existing EPA calculation methods at home and abroad were summarized. According to the different characteristics of bridge structure and building structure, the calculation formula of EPA for bridge structure time history analysis was modified. Secondly, the smoothing processing problem of seismic wave response spectrum in EPA calculation was studied, and three peak smoothing methods were proposed to analyze the value determination of relevant parameter and the advantages and disadvantages of each method. Finally, this method was applied to the time history analysis of a long-span cable-stayed bridge, and the displacement and internal force results of the structure based on PGA and EPA were compared. The results showed that the time history analysis results obtained by the peak adjustment method based on EPA were more reliable.
The earthquake early warning system PRESTo and its localized application in Yunnan seismic network
Lü Shuai, Yang Zhousheng, Yao Yuan
2023, (1): 21-27.   doi: 10.19987/j.dzkxjz.2022-047
[Abstract](43) [FullText HTML](18) [PDF 3282KB](7)
Abstract:
This paper introduces the main functions, parameter configuration of PRESTo, an Italian real-time earthquake warning software platform. Based on the waveform data recorded during the Yunlong M5.0 earthquake in Yunnan in 2016, PRESTo was tested, and the relevant characteristics of the software were summarized.
Improvement and service of Hainan earthquake emergency technology platform
Chen Xingyu, Wu Shuang, Fan Yupei
2023, (1): 28-32.   doi: 10.19987/j.dzkxjz.2022-169
[Abstract](25) [FullText HTML](11) [PDF 3133KB](3)
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Hainan earthquake emergency technology platform is a supporting platform for the technical linkage service of earthquake emergency in Hainan Province, which plays an important role in rapid assessment, command and dispatch in earthquake emergency work. This paper focuses on the analysis of the working ideas and technical design of the upgrading and construction of Hainan earthquake emergency technology platform. Since the platform was put into operation in 2022, Hainan earthquake emergency command center and the earthquake emergency departments of 19 cities (counties) across the province have realized the interconnection within the LAN, data transmission and disaster reporting, and provided the local government departments at all levels with efficient and integrated command and decision-making services in practical work.
News, recent developments and progress-Written on the 50th anniversary of Progress in Earthquake Sciences
Liu Wenyi, Li Li, Wang Wenqing
2023, (1): 33-48.   doi: 10.19987/j.dzkxjz.2021-105
[Abstract](145) [FullText HTML](52) [PDF 3828KB](4)
Abstract:
On the 50th anniversary of Progress in Earthquake Sciences, the scientific bibliometrics methods supplied by CiteSpace are used to conduct author collaboration network analysis and keyword co-occurrence analysis of the 7151 papers published in Recent Developments in World Seismology from 1979 to 2020. The work aims to systematically explore the thematic context, knowledge evolution, historical hot spots and author group development of the publications of Recent Developments in World Seismology in the different periods. The continuous changes in the theme, advancement of knowledge evolution, and the exchange of historical hot spots showed by papers in Recent Developments in World Seismology fully reflect the past, present and future of seismology. Based on the introduction of scientific communication and the journal publishing model evolution, suggestions such as integrating the scientific resources of the China Earthquake Administration, promoting the intensive publishing, and attracting high-level papers to be initially published in seismic journals are put forward to solve the “multiple, scattered, and weak” problem of seismic journals.
Supported by: Beijing Renhe Information Technology Co., Ltd. 百度统计