玉树M_S7.1级地震D-InSAR地表形变场获取与分析
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摘要
采用ALOS PALSAR数据获取2010年4月14日玉树MS7.1级地震InSAR同震形变场。针对PALSAR轨道残差相位,采用最小二乘方法去除。对同震形变图和形变剖面图的分析表明,此次受灾最严重的区域位于震中东南方20～30km至玉树城区附近,推测出露地表破裂带长度约30km,发震断层东北盘表现为抬升盘,西南盘为下降盘。最大相对卫星视线向形变量高达0.44m,观测结果与野外调查基本一致。
The co-seismic displacement of Yushu earthquake occurred on April 14th,2010 is achieved by D-InSAR using ALOS PALSAR data.For the orbit error of PALSAR,the least squares adjustment technique is firstly used to remove the error ramp.At last,the results of co-seismic displacement interferogram and the profile show that the most serious destroyed area is located 20~30km southeast from the epicenter.The surface rupture is about 30km.The northeast plate of causative fault displaces uplift while the southwest plate experiences subsidence.The maximum deformation in LOS even reaches 0.44 m.These InSAR measured results agree well with the ground survey results.
The co-seismic displacement of Yushu earthquake occurred on April 14th,2010 is achieved by D-InSAR using ALOS PALSAR data.For the orbit error of PALSAR,the least squares adjustment technique is firstly used to remove the error ramp.At last,the results of co-seismic displacement interferogram and the profile show that the most serious destroyed area is located 20~30km southeast from the epicenter.The surface rupture is about 30km.The northeast plate of causative fault displaces uplift while the southwest plate experiences subsidence.The maximum deformation in LOS even reaches 0.44 m.These InSAR measured results agree well with the ground survey results.
引文
[1]GEO's Yushu Event Website.http://supersites.unavco.org/yushu.php.
[2]http://web2.ges.gla.ac.uk/～zhli/Qinghai_Yushu_EQ.htm.
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[4]Wegmuller U.and Werner C.Gamma documentation-user’sguide,Differential Interferometry-DIFF[S].Version1.2-November 2008.
[5]周荣军,闻学泽,蔡长星等.甘孜—玉树断裂带的近代地震与未来地震趋势估计[J].地震地质,1997,(2).
[6]Massonnet D,Rossi M,Carmona C,et al.The displacementfield of the Landers earthquake mapped by radar interferometry.[J].Nature,1993,364:138～142.
[7]Li,Z W,Ding,X L,Huang,C,et al.Filtering Method forRadar Interferogram with Strong noise.[J].InternationalJournal of Remote Sensing,2006,27(14):2991～3000.
[8]Hu,J.,Li,Z.W.,Zhu,J.J.,et al.Two-dimensional Co-Seismic Surface Displacements Field of the Chi-Chi EarthquakeInferred from SAR Image Matching.[J].Sensors,2008,8,6484～6495.
[2]http://web2.ges.gla.ac.uk/～zhli/Qinghai_Yushu_EQ.htm.
[3]Ramon F.Hanssen.Radar Interferometry data interpretation anderror analysis.[M].Kluwer Academic Publishers.
[4]Wegmuller U.and Werner C.Gamma documentation-user’sguide,Differential Interferometry-DIFF[S].Version1.2-November 2008.
[5]周荣军,闻学泽,蔡长星等.甘孜—玉树断裂带的近代地震与未来地震趋势估计[J].地震地质,1997,(2).
[6]Massonnet D,Rossi M,Carmona C,et al.The displacementfield of the Landers earthquake mapped by radar interferometry.[J].Nature,1993,364:138～142.
[7]Li,Z W,Ding,X L,Huang,C,et al.Filtering Method forRadar Interferogram with Strong noise.[J].InternationalJournal of Remote Sensing,2006,27(14):2991～3000.
[8]Hu,J.,Li,Z.W.,Zhu,J.J.,et al.Two-dimensional Co-Seismic Surface Displacements Field of the Chi-Chi EarthquakeInferred from SAR Image Matching.[J].Sensors,2008,8,6484～6495.
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