| Influence of the Kunlun Mountain Ms8.1 Earthquake on Horizontal Crustal Deformation in the Sichuan and Yunnan Area |
| |
| 作者姓名： | Yang Guohua |
| |
| 作者单位： | Yang Guohua 1)，Jiang Zaiseng 2)，Zhang Fengshuang 1)，Liu Xia 1)，Han Yueping 1)，Shen Wuchun 1)，and Wang Li 1) 1) First Crust Monitoring and Application Center，CEA，Tianjin 300180，China2) Institute of Earthquake Science，CEA，Beijing 100036，China |
| |
| 基金项目： | 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 |
| |
| 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 rotation.According 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 predominant.After 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 predominant.In 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 neighborhood.After the earthquake,the Sichuan area was surface contractive(the further north,the greater it was),and south of it was an area of superficial expansion.Generally speaking,the Kunlun Mountain M-S8.1 earthquake played an active role in the accumulation of energy in the Sichuan and Yunnan area.Special attention shall be focused on the segment of Xichang-Dongchuan and its neighborhood.
|
| 关 键 词： | 昆仑山 8.1级地震 四川 云南 GPS 地震波 |
| 修稿时间： | 2006-10-30 |
Influence of the Kunlun Mountain Ms8.1 Earthquake on Horizontal Crustal Deformation in the Sichuan and Yunnan Area |
| |
| Yang Guohua.Influence of the Kunlun Mountain Ms8.1 Earthquake on Horizontal Crustal Deformation in the Sichuan and Yunnan Area[J].Earthquake Research in China,2007,21(3):269-280. |
| |
| Authors: | Yang Guohua |
| |
| Institution: | First Crust Monitoring and Application Center, CEA, Tianjin 300180, China |
| |
| Abstract: | |
| |
| Keywords: | Ms8 1 Kunlun Mountain earthquake Sichuan and Yunnan area GPS Horizontal movement and strain Earthquake risk |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《中国地震研究》浏览原始摘要信息 |
| 点击此处可从《中国地震研究》下载免费的PDF全文 |
|
