DInSAR技术监测玉树地震同震形变场的研究
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摘要
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 become a widely used tool for measuring surface displacements,with centimeter or even more millimeter levels 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.
Over the past two decades differential interferometric synthetic aperture radar(DInSAR) has become a widely used tool for measuring surface displacements,with centimeter or even more millimeter levels 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.
引文
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[2]闻学泽,徐锡伟,郑荣章,等.甘孜—玉树断裂的平均滑动速率与近代大地震破裂[J].中国科学(D辑),2003(33):199-208.
[3]谢毓寿,蔡美彪.中国地震历史资料汇编第三卷(下)[M].北京:科学出版杜,1987:235-236.
[4]刘超,许力生,陈运泰.2010年4月14日青海玉树地震快速矩张量解[J].地震学报,2010,32(3):366-368.
[5]许力生,邸海滨,冯万鹏,等.2010年青海玉树Ms 7.1地震近断层地面运动估计[J].地球物理学报,2010,53(6):
[6]胡波,汪汉胜.DInSAR技术对地震同震形变场的研究[J].测绘工程,2010,19(1):9-12.
[7]沈强,乔学军,王琪,等.中国玉树Mw 6.9地震InSAR地表形变特征分析[J].大地测量学与地球动力学,2010,30(3):
[8]GABRIEL A K,GOLDSTEIN R M,ZEBKER H A.Mapping small elevation changes over large areas:Differ-ential radar interferometry[J].Journal of Geophysical Re-search,1989,94(B7):9183-9191.
[9]MASSONNET D,ROSSI M,CARMONA C,et al.Thedisplacement field of the Landers earthquake mapped byradar interferometry[J].Nature,1993,364(8):138-142.
[10]ZEBKER H A,ROSER P A,GOLDSTEIN R M.etal.On the derivation of coseismic displacement fields u-sing differential radar interfereometry-the Landers earth-quake[J].J.Geophys.Res.1994,99:19-617-19634.
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