DInSAR技术监测玉树地震同震形变场的研究

Research on extract Yushu earthquake coseismic deformation by Differential Interferometry Synthetic Aperture Radar

近二十年来,合成孔径雷达干涉测量技术(DInSAR)作为一种监测地表形变的有效技术得到广泛应用,其视线向精度可达厘米级甚至毫米级。该技术尤其是对监测快速、激烈的地表形变更为有效,如地震、火山等。利用DInSAR技术,选用日本ALOS卫星PALSAR数据,获取了2010-04-14玉树Mw6.9地震的同震形变场。结果表明:地表至少发生过3次地表破裂,沿断层走向的形变分布范围远远大于垂直断层分布范围,形变分布特征以左旋走滑为主。

Over the past two decades differential interferometric synthetic aperture radar （DInSAR） has be- come a widely used tool for measuring surface displacements,with centimeter or even more millimeter lev- els precision in line of sight（LOS）. DInSAR is a very effective technique especially for monitoring fast and intence deformation,such as earthquake, volcano, and so on. In this work, using DInSAR technology, we selected the Japanese satellite ALOS/PALSAR data, obtained the coseimic surface deformation of Yushu earthquake Mw6.9 on April 14,2010. Analysis results show that there were surface ruptures three times at least, the deformation along the fault was much larger than that of the perpendicular, the distribution of deformation dominated by left-lateral strike-slip.