[1]章阳,陈婷,王利兵,等.四川长宁6.0级地震库仑应力变化及其对余震的触发作用[J].华南地震,2020,40(04):85-92.[doi:10.13512/j.hndz.2020.04.012]
　ZHANG Yang,CHEN Ting,WANG Libing,et al.The Coulomb Stress Change of the Sichuan Changning 6.0 Earthquake and Its Triggering Effect on Aftershocks[J].,2020,40(04):85-92.[doi:10.13512/j.hndz.2020.04.012]
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四川长宁6.0级地震库仑应力变化及其对余震的触发作用()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
40
期数:
2020年04期
页码:
85-92
栏目:
地震研究
出版日期:
2020-12-30

文章信息/Info

Title:
The Coulomb Stress Change of the Sichuan Changning 6.0 Earthquake and Its Triggering Effect on Aftershocks
文章编号:
1001-8662（2020）04-0085-08
作者:
章阳1; 陈婷2; 王利兵3; 罗娜3; 张朋杰3
1.河北省地震局石家庄中心台,石家庄 050021;2.河北省地震局预测研究中心,石家庄 050021;3.河北省地震局红山基准台,河北 邢台 054000
Author(s):
ZHANG Yang1; CHEN Ting2; WANG Libing3; LUO Na3; ZHANG Pengjie3
1.Shijiazhuang Center Seismic Station,Hebei Earthquake Agency,Shijiazhuang 050021, China;2.Forecasting Research Center,Hebei Earthquake Agency,Shijiazhuang 050021,China;3.Hongshan Benchmark Station,Hebei Earthquake Agency,Xingtai 054000,China
关键词:
长宁地震; 库仑应力变化; 粘弹性模型; 应力触发; 地震危险性
Keywords:
Changning Earthquake; Coulomb stress change; Viscoelastic model; Stress triggering; Seismic haz-ard
分类号:
P315
DOI:
10.13512/j.hndz.2020.04.012
文献标志码:
A
摘要:
2019年6月17日四川长宁发生6.0级地震,截至8月20日总共记录到3级以上余震64次。此次地震发生在一条北西向的隐伏断层。为分析区域地震危险性,综合考虑同震位错和震后粘滞松弛效应,利用PSGRN/PSCMP程序计算地震破裂面上产生的库仑应力变化,分析长宁6.0级地震的长时间尺度库仑应力演化特征及其对3级以上余震的触发作用。结果表明3级以上余震发生在应力触发区概率达到96.9%。同时计算Burgers粘弹性模型的长时间尺度库仑应力动态变化。结果显示应力触发区主要分布在震区的北北西、南南东、北东东和南西西向,将库仑应力动态演化特征应用到本区地震危险性分析时,重点关注上述应力触发区,为后续余震发生提供地点依据。
Abstract:
On June 17th,2019,an MS6.0 earthquake occurred in Changning,Sichuan Province. 64 aftershocks with M≥3 were recorded until August 20th. The earthquake occurred on a buried fault in the northwest direction. To analyze the regional seismic hazard,this paper comprehensively considers the co-seismic dislocation and post-earthquake viscous relaxation effects,uses the PSGRN/PSCMP program to calculate the Coulomb stress change generated on the earthquake rupture surface,and analyzes the long-time scale Coulomb stress evolution characteristics of the Changning M6.0 earthquake and its triggering effect on aftershocks with M≥3. The results show that the probability of aftershocks with M≥3 occurring in the stress triggering zone reaches 96.9%.At the same time,the paper calculates the long-term dynamic Coulomb stress change by using Burgers viscoelastic mod-el. It shows that the stress triggering areas are mainly distributed in the north-north-west,south-south east,north-east and south-west directions of the earthquake area.The paper applies the dynamic evolution characteristics of Coulomb stress to the seismic hazard analysis of this area,and focus on the above-mentioned stress triggering area to provide a location basis for subsequent aftershocks.

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备注/Memo

备注/Memo:
收稿日期: 2019-10-20
基金项目: 2019年震情跟踪定向工作任务（2019010122）和2019年河北省地震科技星火计划青年项目（DZ20190419028）联合资助。
作者简介:章阳（1989-）,男,工程师,主要从事数字地震学与地震应力触发等方面的研究。
E-mail: zhangyang_ouc@163.com
更新日期/Last Update: 2020-12-20