DISTRIBUTION CHARACTERS OF WENCHUAN EARTHQUAKE AFTERSHOCKS IN ZIPINGPU RESERVIOR REGION

doi:10.3969/j.issn.0253-4967.2010.04.008

SEISMOLOGY AND GEOLOGY ›› 2010, Vol. 32 ›› Issue (4): 607-613.DOI: 10.3969/j.issn.0253-4967.2010.04.008

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DISTRIBUTION CHARACTERS OF WENCHUAN EARTHQUAKE AFTERSHOCKS IN ZIPINGPU RESERVIOR REGION

LI Hai-ou¹, MA Wen-tao¹, XU Xi-wei¹, XIE Rong-hua², YUAN Jing-li¹, XU Chang-peng¹

1. Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Earthquake Administration of Sichuan Province, Chengdu 610041, China

Received:2010-07-04 Revised:2010-12-07 Online:2010-12-30 Published:2011-06-01

汶川8.0级地震后紫坪铺水库库区地震的分布特征

李海鸥¹, 马文涛¹, 徐锡伟¹, 谢蓉华², 苑京立¹, 徐长鹏¹

1. 中国地震局地质研究所, 北京, 100029;
2. 四川省地震局水库地震研究所, 成都, 610041

作者简介:李海鸥,男,1975年生,1998年毕业于大庆石油学院应用地球物理专业,2006年在中国地质大学获得博士学位,2008年在中国地震局地质研究所完成博士后研究工作,现主要从事地震学、诱发地震研究,E-mail:li_hai_ou@126.com.
基金资助:
“十一五”国家科技支撑计划项目(2008BAC38B0401);中国地震局地质研究所基本科研业务专项(DFIGCEA060828)共同资助

Abstract

Abstract: 815 aftershocks of Wenchuan earthquake recorded by 12 seismic stations in 2009 were relocated using the double difference algorithm to analyze the seismic activity of the Zipingpu reservoir.Relocation results show that the epicenters of aftershocks concentrate relatively in three regions.Focal depth distribution characters of different concentration regions take on obvious difference.This means earthquakes in different concentration regions may have different causes.Compared with relocations of earthquakes taking place before the Wenchuan earthquake done by other researchers,locations of the seismic concentration regions in the reservoir area changed noticeably after the Wenchuan earthquake.These variations are related with the stress adjustment of local part in the reservoir area and may also be related with the diffusion depth and range of increased pore pressure caused by rock failure in the course of Wenchuan earthquake.

Key words: Wenchuan earthquake, Zipingpu reservoir, double-difference algorithm, pore pressure diffusion

摘要： 采用双差定位方法对紫坪铺水库库区12个地震台站2009年记录的857个地震进行了重新定位,获得了815个地震的震源位置。定位结果显示库区有3个地震相对集中区域,在各个集中区域地震震源深度的分布特征各不相同。与已有的汶川8.0级地震前库区地震精定位的研究结果相比较,汶川8.0级地震后库区地震相对集中区域的位置关系发生了明显变化。

关键词: 汶川地震, 紫坪铺水库, 双差定位方法, 孔隙压力扩散

CLC Number:

P315.2

LI Hai-ou, MA Wen-tao, XU Xi-wei, XIE Rong-hua, YUAN Jing-li, XU Chang-peng. DISTRIBUTION CHARACTERS OF WENCHUAN EARTHQUAKE AFTERSHOCKS IN ZIPINGPU RESERVIOR REGION[J]. SEISMOLOGY AND GEOLOGY, 2010, 32(4): 607-613.

李海鸥, 马文涛, 徐锡伟, 谢蓉华, 苑京立, 徐长鹏. 汶川8.0级地震后紫坪铺水库库区地震的分布特征[J]. 地震地质, 2010, 32(4): 607-613.

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DISTRIBUTION CHARACTERS OF WENCHUAN EARTHQUAKE AFTERSHOCKS IN ZIPINGPU RESERVIOR REGION

汶川8.0级地震后紫坪铺水库库区地震的分布特征

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