紫坪铺水库与汶川地震关系的讨论

doi:10.3969/j.issn.0253-4967.2011.01.017

摘要/Abstract

摘要：

利用紫坪铺水库专用地震台站和加密地震台站资料,使用双差法完成了震前930次地震、汶川8级主震和5, 789次余震的重新定位,探讨了紫坪铺水库与汶川地震之间的关系,获得了有利于证明它们之间密切关联的事实: 1)紫坪铺水库2005年蓄水之后出现了水磨、深溪沟和都江堰震群,地震应变能释放增加了200%,与库水位变化密切相关,在汶川地震前呈现出加速释放的现象; 2)野外调查表明存在1条贯穿紫坪铺水库库区、走向NE的同震地表破裂带,与中滩铺断层位置一致; 3)余震分布以中滩铺断层为界,西北上盘多,东南下盘少; 4)利用P波初始到时重新确定出的汶川主震发震时刻为27分59.5秒,初始破裂深度在6～9km左右,直接位于水磨震群之下; 5)汶川主震与发生在2008年4月5日水磨震群中的1次小震的各个台站到时差相同。

关键词: 紫坪铺水库, 汶川地震, 水库诱发地震, 同震地表破裂, 初始破裂地点, 震群

Abstract:

Using the observations of the Zipingpu reservoir seismic network(including seven short-period seismic stations,with an average station distance of 10km)of the period from July 2004 to 2009,and the data from January-December 2009 recorded by the intensive seismic observation network(six short-period seismic stations with the station spacing of 3km),930 foreshocks near Zipingpu reservoir,the main shock,and 5789aftershocks,as well as the initial rupture of the M_S 8.0 Wenchuan earthquake were relocated with double difference location algorithm.Combined with the geological field investigations,the analysis of seismic activity in Zipingpu reservoir area,the distribution of coseismic surface rupture,the depth of initial rupture location of Wenchuan M_S 8.0 earthquake,and the aftershock distribution,we find that the occurrence of M_S 8.0 Wenchuan earthquake has close relation with Zipingpu reservoir: 1) The seismic swarms at the Shuimo,and Dujiangyan and Shenxigou area are 10 kilometers away from the reservoir,the seismic strain release caused by Zipingpu reservoir increased by 200%,and the release was closely related to water level changes and accelerated before the Wenchuan earthquake; 2) There are two northeast directed coseismic surface rupture zones with 1m displacement along Zhongtanpu Fault; 3) the aftershocks of Wenchuan earthquakes are mainly distributed on northwestern wall of the Zhongtanpu Fault; 4) The relocation revealed that the Wenchuan earthquake occurred at 27minutes,59.5 seconds,the depth is between 6～9km; and 5) by comparison,the focal depths of the fore-shocks occurring on 2008-04-05 are about 7.8km,and the initial time of waveforms of this swarm is same as that of the M_S 8.0 Wenchuan earthquake.

Key words: Zipingpu reservoir, Wenchuan earthquake, reservoir-induced seismicity, coseismic surface rupture, initial rupture, earthquake swarm

中图分类号:

P315.2

马文涛, 徐长朋, 张新东, 徐锡伟, 李海鸥, 苑京立. 紫坪铺水库与汶川地震关系的讨论[J]. 地震地质, 2011, 33(1): 175-190.

MA Wen-tao, XU Chang-peng, ZHANG Xin-dong, XU Xi-wei, LI Hai-ou, YUAN Jing-li. STUDY ON THE RELATIONSHIP BETWEEN THE RESERVOIR-INDUCED SEISMICITY AT ZIPINGPU RESERVOIR AND THE M_S 8.0 WENCHUAN EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2011, 33(1): 175-190.

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