A Study on the Characteristics of Anomalies and Their Dynamic Relationship before the April 14, 2010 M_S 7.1 Yushu Earthquake

作     者：Ma Yuhu Chen Yuhua 

作者机构：Earthquake Administration of Qinghai Province 

出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)

年 卷 期：2013年第27卷第1期

页      面：39-51页

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：funded by Earthquake Tendency Tracing of 2011 of Department of Monitoring and Prediction of CEA under the"Earthquake Short and Imminent Prediction Climb Program of2020"(2011016301) 

主　　题：前兆异常 玉树 动态关系 中期趋势异常 地震活动 特征 异常行为 前兆观测 

摘      要：The authors studied the seismic activity, precursory anomalies and abnormal animal behavior before the April 14, 2010 MS7.1 Yushu earthquake. Analysis showed that anomalies were not rich before the MS7.1 Yushu earthquake, but prominent anomalies were observed, such as the long and mid-term trend anomaly characterized by the seismic quiescence of MS6.0, MS5.0 and MS4.0 earthquakes, and the anomalies in precursor observation of surface water temperature in Yushu and Delingha and electromagnetic measurement in Pingan. There were a large number of animal behavior anomalies appearing one week before the earthquake. An M4.7 earthquake occurred 130 minutes before the main shock. In this paper, we studied the dynamic process of the Yushu earthquake preparation using the earthquake focal mechanism solutions on the Bayan Har block boundary since 1996. The results show that the Kalakunlun M7.1 earthquake in 1996, the Mani M7.5 earthquake and the Yushu MS7.1 earthquake have the same dynamic process. Long and mid-term trend anomalies may be related to the dynamics of evolution of different earthquakes. This paper also discusses the recurrence interval of strong earthquakes, foreshock identification and precursor observation of the Yushu MS7.1 earthquake.