玉树地震地表变形InSAR观测及初步分析

姚鑫; 张永双; 杨农; 熊探宇

玉树地震地表变形InSAR观测及初步分析

国土资源部新构造运动与地质灾害重点实验室; 中国地质科学院地质力学研究所, 北京 100081

基金项目:

自然科学基金项目 40902059

地质力学研究所基本科研业务费项目 DZLXJK200906

中国地质调查局工作项目 1212010914025

详细信息

作者简介:
姚鑫(1978-), 男, 博士, 地质工程专业。E-mail: yaoxinphd@163.com
通讯地址: 北京市海淀区民族大学南路11号, 中国地质科学院地质力学研究所, 100081

中图分类号: P315.2
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- 被引次数: 0
出版历程
- 收稿日期: 2010-05-16
- 刊出日期: 2010-06-01

D-INSAR OBSERVATION OF EARTH SURFACE DEFORMATION IN THE M_S7.1 YUSHU EARTHQUAKE

Key Laboratory of Neotectonic Movement & Geohzards, Ministry of Land and Mineral Resource; Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 采用玉树M_S7.1级地震前后两期PALSAR雷达数据(震前2010年1月15日, 震后4月17日)进行了“两轨+DEM”的InSAR处理, 获得了高质量的差分干涉雷达条纹图像和同震变形场。参考该区的基本构造格局, 根据干涉图像的变形范围、变形量和变形梯度可以初步判断:(1)玉树地震诱发了总体上NWW走向, 全长约70km地表陡变带, 陡变带南段位错及陡变梯度较大, 会在地表产生地表破裂；而西北部4段位错及陡变梯度较小, 不易在地表诱发破裂, 但可能在地下一定层位产生了隐伏破裂带；(2)陡变带两侧的雷达视线向运动方向预示发震断裂以左旋走滑运动为主；(3)宏观震中位于玉树县城西北约16km的地表陡变带上。D-InSAR解译结果与中国地震台网中心震源机制解、野外发震断裂调查结果及地貌特征吻合较好, 证明了干涉雷达解译成果的可靠性, 可以为准确定位玉树地震发震断裂地表行迹和快速评定震害损失提供有力的技术支持。
- 玉树地震 /
- 干涉合成孔隙雷达 /
- 地表破裂 /
- 同震形变场
Abstract: A "Two Paths+DEM" interferometric process was made for the PALSAR SAR data before (Jan. 15, 2010) and after (Apr. 17, 2010) the Yushu M_S7.1 Earthquake, which yielded a high-quality co-seismic InSAR strip image and absolutely surface deformation. Based on the deformation scale, deformation magnitude and deformation gradient, in combination with tectonic setting of the area, the following conclusions can be drawn: (1) Yushu earthquake triggered a 70-km NWW-extending mutation belt, with a southern section Showing greater dislocation and deformation gradient, which will induce surface raptures, and No. 4 segment in northwestern part showing weaker deformation and no ruptures on the ground surface. (2) The SAR motive directions from both sides of mutation belt indicate a dominant sinistral movement of seisgenic faults. (3) The macro-epicenter is located on the mutation belt 16km northwest of Yushu County. The present InSAR interpretations match well with the seismic mechanics, field investigations and geomorphology features from the China Earthquake Networks Center, and can provide better support for rapid evaluation to earthquake hazard and accurately ing surface track of seismogenic fault.
- Yushu Earthquake /
- InSAR /
- Surface Rupture /
- Coseismal seismic Deformation

HTML全文

图 1 甘孜-玉树断裂带地表活动形迹图(据周荣军等^[14], 1997年修改)及干涉雷达覆盖范围

Figure 1. A map showing the distribution map of Gznai-Yushu active fault zone (after Zhou Rongjun, 1997) and InSAR covering area

下载: 全尺寸图片幻灯片

图 2 玉树地震同震形变InSAR缠绕条纹图

Figure 2. Wrapped InSAR strip image of Yushu earthquake co-seismic deformation

下载: 全尺寸图片幻灯片

图 3 玉树地震干涉雷达视线向变形图

Figure 3. InSAR LOS Deformation of Yushu earthquake

下载: 全尺寸图片幻灯片

图 4 干涉雷达解译地表破裂带(背景为90m SRTM制作的玉树地区地形阴影图)

Figure 4. Surface ruptures based on InSAR (Background is the 90m SRTM hillshade map)

下载: 全尺寸图片幻灯片

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