利用星载D-INSAR技术获取的地表形变场研究张北-尚义地震震源破裂特征  

Using Deformation Field Obtained by Spaceborne D-INSAR Technique to Research Characteristics of Source Rupture of Zhangbei-Shangyi Earthquake

作　　者：单新建[1] 马瑾[1] 宋晓宇[1] 王超[2] 柳稼航[1] 张桂芳[1] 

机构地区：[1]中国地震局地质研究所,中国地震局构造物理开放实验室,中国北京100029 [2]中国科学院遥感应用研究所,中国北京100101

出　　处：《中国地震》2002年第2期119-126,共8页Earthquake Research in China

基　　金：国家重点基础研究规划项目 (G19980 40 70 3);国家自然科学基金 (4 980 2 0 2 7;40 142 0 31)共同资助

摘　　要：近 10年来 ,合成孔径雷达差分干涉测量技术 (D INSAR ,DifferentialInterferometricSyn theticApertureRadar,简称 :雷达差分干涉测量 )取得了令世人瞩目的成绩 ,已成为极具有潜力的空间对地观测新技术。但如何利用D INSAR测量结果来揭示震源破裂信息 ,成为目前被关注的问题。本文简单地论述了震源位错模型的基本原理 ,并以 1998年 1月 10日张北 -尚义地震为例 ,利用差分干涉形变场图像 ,采用弹性半空间介质中的震源位错模型 ,正演了发震断层某些几何学和运动学性质。结果表明 :张北 -尚义地震破裂面属左旋逆走滑断层 ,走向SEE NWW2 72° ,倾角 4 6° ;破裂方向为由SEE至NWW的单侧破裂 ;破裂面长 9km ,宽 8km ,深度 8km ;三个方向的位移矢量分别为 :2 90mm、5 6 0mm和 0mm。The D-INSAR(Differential Interferometric Synthetic Aperture Radar) technique has got great achievement in the world in the last ten years, it has been a new space observation technique with great potential. But how to disclose source rupture information by D-INSAR meterage result is a more concerned issue at present. The basic theory of seismic focus dislocation model is discussed. Basing on the detailed analysis of interferometric deformation field of Zhangbei-Shangyi earthquake on Jan.10,1998, and seismic focus dislocation model in elastic half-space medium. Geometry and kinematics characteristics of main seismic fault are deduced. Results show as follows:seismic break surface of Zhangbei-Shangyi earthquake is left-slip and thrust fault,strike SEE-NWW 272°;dip angle 46°; break direction is simple unilateral from SEE to NWW; length of break surface is 9km,width is 8km, and depth is 8km, displacement vector of three direction are 290mm,560 and 0mm.

关 键 词：地表形变场 雷达差分干涉形变图 震源位错 震源特征 张北-尚义地震 

分 类 号：P315.2[天文地球—地震学]