Variational characteristics of shear-wave splitting on the 2001 Shidian earthquakes in Yunnan, China

作     者：GAO Yuan(高原) LIANG Wei(梁维) DING Xiang(丁香) XUE Yan(薛艳) CAI Ming-jun(蔡明军) LIU Xi-qiang(刘希强) SU You-jin(苏有锦) PENG Li-guo(彭立国) 

作者机构：Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Graduate School Chinese Academy of Sciences Beijing 100039 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Earthquake Administration of Yunnan Province Kunming 650041 China Earthquake Administration of Shandong Province Ji''nan 250014 China Earthquake Administration of Yunnan Province Kunming 650041 China Center for Comprehensive Surveying China Earthquake Administration Beijing 100039 China 

出 版 物：《Acta Seismologica Sinica(English Edition)》 (ACTA SEISMOLOGICA SINICA)

年 卷 期：2004年第17卷第6期

页      面：635-641页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：National Natural Science Foundation of China (40274011  40074020)  MOST (2001BA601B02) and Joint Seismological Science Foundation of China (102068) 

主　　题：shear-wave splitting temporal change earthquake stress-forecasting Shidian earthquakes SAM analysis 

摘      要：In 2001 three earthquakes occurred in Shidian in Yunnan Province, which were the MS=5.2 on April 10, the MS=5.9 on April 12 and the MS=5.3 on June 8. Based on the data from the station Baoshan of Yunnan Telemetry Digital Seismograph Network, the variational characteristics of shear-wave splitting on these series of strong earthquakes has been studied by using the systematic analysis method (SAM) of shear-wave splitting. The result shows the time delays of shear-wave splitting basically increase with earthquake activity intensifying. However the time delays abruptly decrease immediately before strong aftershocks. It accords with the stress relaxation before earthquakes, which was found recently in study on shear-wave splitting. The result suggests it is significant for reducing the harm degree of earthquakes to develop the stress-forecasting on earthquake in strong active tectonic zones and economic developed regions or big cities under the danger of strong earthquakes.