| 根据2001年Mw 78可可西里强震InSAR同震测量结果反演东昆仑断裂两侧地壳弹性介质差异 |
| |
| 引用本文： | 陶玮,沈正康,万永革,单新建,马超.根据2001年Mw 78可可西里强震InSAR同震测量结果反演东昆仑断裂两侧地壳弹性介质差异[J].地球物理学报,2007,50(3):744-751. |
| |
| 作者姓名： | 陶玮 沈正康 万永革 单新建 马超 |
| |
| 作者单位： | 1.地震动力学国家重点实验室，中国地震局地质研究所，北京100029 2 Department of Earth and Space Sciences，UCLA，Los Angeles, CA 90095-1567, USA 3 防灾科技学院，北京东燕郊101601 4 太原理工大学, 太原030024 |
| |
| 基金项目： | 国家自然科学基金重点项目(40334042)，科技部国家重点基础研究发展计划“973项目”(2004CB418403)，和国家自然科学基金项目(40504014)资助 |
| |
| 摘 要： | 利用2001年 Mw 78 可可西里强震InSAR同震测量结果，反演了青藏高原北部东昆仑断裂两侧地壳弹性介质差异.InSAR测量结果显示断层南侧的同震位移比北侧的大20％～30%.根据人工地震反射剖面建立岩石圈模型，以断层两侧杨氏模量差异和震源破裂深度为反演变量，通过有限元方法模拟实测得到的同震位移剖面.反演得到最佳断层破裂深度为20～22km，断层南侧杨氏模量相对北侧比值为81%～92%.结果表明，断层两侧弹性介质性质存在明显差异，由于构造运动作用，断层南部地壳不及北部地壳坚硬.前人利用地震层析成像和大地电磁测深等手段推断青藏高原内昆仑山断裂以南可可西里－羌塘地块地壳内广泛发育低速高导层，我们通过形变场力学分析得到与此相一致的结果.
|
| 关 键 词： | InSAR 同震变形 反演 弹性差异 青藏高原 |
| 文章编号： | 0001-5733（2007）03-0744-08 |
| 收稿时间： | 2006-09-18 |
| 修稿时间： | 2006-09-18 |
Crustal elasticity contrast across the East Kunlun fault in northern Tibet inferred from InSAR measurements of the 2001 Mw 7.8 Kokoxili earthquake |
| |
| TAO Wei,SHEN Zheng-Kang,WAN Yong-Ge,SHAN Xin-Jian,MA Chao.Crustal elasticity contrast across the East Kunlun fault in northern Tibet inferred from InSAR measurements of the 2001 Mw 7.8 Kokoxili earthquake[J].Chinese Journal of Geophysics,2007,50(3):744-751. |
| |
| Authors: | TAO Wei SHEN Zheng-Kang WAN Yong-Ge SHAN Xin-Jian MA Chao |
| |
| Institution: | 1.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029，China 2 Department of Earth and Space Sciences，UCLA，Los Angeles, CA 90095-1567, USA 3 The College of Disaster Prevention Techniques，East Yanjiao, Beijing 101601，China 4 Taiyuan University of Technology, Taiyuan 030024，China |
| |
| Abstract: | We use coseismic deformation data of the 2001 Mw 78 Kokoxili earthquake obtained from InSAR measurements to study crustal elasticity contrast across the East Kunlun fault. Coseismic deformation field of the earthquake documented by InSAR studies indicated that the displacements on the south side were 20%～30% higher than that on the north side of the fault. We develop an elastic finite element model and invert InSAR data from two deformation profiles to estimate two parameters: the Young's modulus contrast across the fault and the fault rupture depth. The starting lithospheric structural model is adopted from a seismic reflection study on the north side of the East Kunlun fault. Our result shows optimal estimates of the earthquake rupture depth as 20～22 km and the crustal Young's modulus contrast between the south and north side as 81%～92%. Such a result, obtained from study of crustal deformation, suggests a softer crust south than north of the fault, which is consistent with previous tomographic and magnetotelluric studies of a low velocity and high conductivity layer existing in lower crust of the Kokoxili Qiangtang block south of the Kunlun fault. |
| |
| Keywords: | InSAR Coseismic deformation Inversion Elasticity contrast Tibetan plateau |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
