Influence of the Kunlun Mountain M_S8.1 Earthquake on Horizontal Crustal Deformation in the Sichuan and Yunnan Area

作     者：Yang Guohua Jiang Zaiseng Zhang Fengshuang Liu Xia Han Yueping Shen Wuchun Wang Li 

作者机构：First Crust Monitoring and Application Center CEA Tianjin 300180 China Institute of Earthquake Science CEA Beijing 100036 China 

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

年 卷 期：2007年第21卷第3期

页      面：269-280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：This project is sponsored by the National Support of Science and Technology Research"Study on Techniques for Monitoring and Predicting of Strong Earthquake"and the Joint Earthquake Science Foundation of CEA(A07066) China 

主　　题：Ms 8.1 Kunlun Mountain earthquake Sichuan and Yunnan area GPS Horizontal movement and strain Earthquake risk 

摘      要：In order to track the space-time variation of regional strain field holistically(in a large scale) and to describe the regional movement field more objectively,the paper uses a nonlinear continuous strain model focused on extracting medium-low frequency strain information on the basis of a region with no *** to the repeated measurements(1999～2001～2004) from GPS monitoring stations in the Sichuan and Yunnan area obtained by the Project of China Crust Movement Measuring Network,and with the movement of 1999～2001(stage deformation background) as the basic reference,we separated the main influencing factors of the Kunlun Mountain M-S8.1 earthquake in 2001 from the data of 2001 and 2004,and the results indicate:(1) the Kunlun Mountain M-S8.1 earthquake has a discriminating effect on the Sichuan and Yunnan area,moreover,the deformation mode and background had not only certain similitude but also some diversity;(2) The movement field before the earthquake was very ordinal,while after the earthquake,order and disorder existed simultaneously in the displacement field;The displacement quantities of GPS monitoring stations were generally several millimeters;(3) The principal strain field before earthquake was basically tensile in an approximate EW direction and compressive in the SN direction,and tension was *** the earthquake,the principal strain field in the Sichuan area was compressive in the EW direction and tensile in the SN direction,and the compression was *** the Yunnan area,it was tensional in the NE direction and compressive in the NW direction,and tension was predominant;(4) The surficial strain before the earthquake was dominated by superficial expansion,the contractive area being located basically in the east boundary of Sichuan and Yunnan block and its *** the earthquake,the Sichuan area was surface contractive(the further north,the greater it was),and south of it was an area of superficial ***