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Journal: Earthquake Research In China  2011 No.2  Share to Sinaweibo  Share to QQweibo  Share to Facebook  Share to Twitter    clicks:985   
Title:
The Focal Mechanism and Characteristic of Stress Field in the Zipingpu Area before the M_S8.0 Wenchuan Earthquake
Author: Zhang Yongjiu and Zhang Zhiwei
Adress: Earthquake Administration of Sichuan Province，Chengdu 610041，China
Abstract: Based on seismic wave records of the Chengdu digital seismic network and Zipingpu reservoir digital seismic network from August 16， 2004 to May 12， 2008 when the Wenchuan MS8. 0 earthquake occurred， the parameters of focal mechanisms of 486 earthquakes with magnitude larger than M1. 6 in the Zipingpu reservoir area were calculated using amplitude ratio method， meanwhile the temporal-spatial variation characteristics of mechanisms and stress field were analyzed based on these parameters． Results show a low ratio of thrust earthquakes and an increased number of strike-slip earthquakes in the reservoir water area in the period from 2006 to 2008. While in the areas far from the reservoir waterfront，the thrust earthquakes took up a high proportion and the strike-slip ones did not increase． The direction of mean principal compressive
stress field was deflected and disturbed differently in each area before the Wenchuan MS8. 0 earthquake．
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