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盘晓东, 贾若, 康建红, 刘冰冰. 2013年10月31日吉林前郭M5.8震群研究[J]. 地震科学进展, 2018, (4): 80-89. DOI: 10.3969/j.issn.0253-4975.2018.04.013
引用本文: 盘晓东, 贾若, 康建红, 刘冰冰. 2013年10月31日吉林前郭M5.8震群研究[J]. 地震科学进展, 2018, (4): 80-89. DOI: 10.3969/j.issn.0253-4975.2018.04.013
Xiaodong Pan, Ruo Jia, Jianhong Kang, Bingbing Liu. Research on Qianguo M5.8 earthquake swarm on October 31,2013[J]. Progress in Earthquake Sciences, 2018, (4): 80-89. DOI: 10.3969/j.issn.0253-4975.2018.04.013
Citation: Xiaodong Pan, Ruo Jia, Jianhong Kang, Bingbing Liu. Research on Qianguo M5.8 earthquake swarm on October 31,2013[J]. Progress in Earthquake Sciences, 2018, (4): 80-89. DOI: 10.3969/j.issn.0253-4975.2018.04.013

2013年10月31日吉林前郭M5.8震群研究

Research on Qianguo M5.8 earthquake swarm on October 31,2013

  • 摘要: 2013年10月31日在吉林省前郭县查干花镇先后发生5.5级和5.0级地震,之后于2013年11月22日、23日又在原地分别发生了5.3级和5.8级、5.0级地震,形成震群活动。震群地震发生在东北断块区松辽断陷带中央坳陷区内,极震区长轴呈北东向展布。本次震群序列共记录1 356次地震,包括5次5级以上地震,记录到完整的地震序列。余震呈NW向密集条带状分布,震群震源断错性质为带有走滑分量的逆冲型错动,综合分析认为,前郭震群地震可能受北东向扶余—肇东断裂和北西向查干泡—道字井断裂控制,其破裂面为北西向,发震构造可能是震源区基底深部一条NW向隐伏逆冲断裂(查干泡—道字井断裂)。前郭5.8级震群在震前出现一部分测震学异常,而前兆异常更丰富,表现为由外围向震中区逐渐逼近,地震发生后前兆异常又表现出由震中区向外围扩散的特征;在时间上,先是从2010年以来出现以破年变为特征的中期趋势异常,逐渐由趋势异常向短期异常再向临震异常演化,临震异常主要以加速转折下降为主。

     

    Abstract: On October 31, 2013, M5.5 and 5.0 earthquakes occurred successively in Chaganhua Town Qianguo County Jilin province. After no more than 1 month, three earthquakes occurred again at the same epicenter on November 22 and 23, 2013, the magnitude of which were 5.3, 5.8 and 5.0. All these earthquakes made up swarm. The earthquake swarm occurred in the central depression area of the Songliao fault zone in the Northeast fault block area, and the long axis of the meizoseismal area was along the northwest direction. 1 356 earthquakes were recorded in this earthquake swarm, including 5 earthquakes with magnitude larger than 5.0. Seismic sequence was recorded completely. The epicenters of aftershocks were densely distributed as strip along NW. The result of focal mechanism solution shows that the dislocation type of seismogenic fault is thrust with slip. The earthquake swarm may be affected by northeast ward Fuyu—Zhaodong fault and northwest ward Chaganpao—Daozijing fault, and the fracture direction is along the northwest. The result of analysis on existing data suggests that the seismogenic structure may be a NW trending thrust fault buried in the deep basement of the epicenter area (Chaganpao-Daozijing fault). Before M5.8 Qianguo earthquake swarm, there were some seismic anomalies, but the precursory anomalies were more abundant, which gradually approached the epicenter from surrounding area. After the swarm, precursory anomalies diffused from epicentral area to surrounding area. From the time point of view, precursory anomalies were medium-term at first, characterized by breaking yearly change from 2010, then gradually transformed into short-term anomalies, at last imminent-earthquake anomalies characterized by transiting to accelerating decease.

     

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