多视线向InSAR形变场约束的改则地震滑动分布反演
摘要
利用3种不同视线向LOS(Line Of Sight)的ENVISAT ASAR数据进行干涉处理,提取多视线向(Multi-LOS)的同震形变场;结合同震形变场特征与震源机制解,构建了改则地震双断层破裂模型;利用四叉树采样后的多视线向同震形变场进行约束,通过梯度下降法(Steepest Descent Method,SDM)与Crust2.0地壳分层模型反演了改则地震的同震滑动分布特征。结果表明:反演的形变残差得到有效控制,基本介于0±10 cm之间;主震断层的滑动量主要位于断层面2—16 km深部,最大滑动量可达1.34 m,位于断层面6.4 km深处;余震断层滑动量主要位于断层面2—6 km深部,最大滑动量可达0.90 m,位于断层面3.52 km深处;主震断层与余震断层均以正断为主,但主震断层还具有一定的左旋走滑分量,而余震断层的左旋走滑不明显;当剪切模量μ取3.2×1010Pa时,反演获得的主震与余震地震矩M0分别为6.34×1018N·M与1.20×1018N·M,分别相当于矩震级MW6.47与MW5.98。
引文
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Hong S Y,Shen X H,Song X G,Shan X J,Liu Z R,Dai Y Q,Kang CL and Jing F.2010.Three-dimensional deformation field caused bythe Gaize earthquake by Multi-LOS DIn SAR Measurement technology//2010 IEEE International Geoscience and Remote Sensing Symposium(IGARSS).Honolulu,HI:IEEE:765-768[DOI:10.1109/IGARSS.2010.5653263]
Jónsson S,Zebker H,Segall P and Amelung F.2002.Fault slip distribution of the 1999 Mw7.1 Hector Mine,California,earthquake,estimated from satellite radar and GPS measurements.Bulletin of theSeismological Society of America,92(4):1377-1389
Lin A M,Fu B H,Guo J M,Zeng Q L,Dang G M,He W G and ZhaoY.2002.Co-seismic strike-slip and rupture length produced by the2001 Ms8.1 central Kunlun earthquake.Science,296(5575):2015-2017[DOI:10.1126/science.1070879]
刘国祥,丁晓利,李志伟,陈永奇,李志林,余水倍.2002.ERS卫星雷达干涉测量:1999年台湾集集大地震震前和同震地表位移.地球物理学报,45(增刊):165-174
马超,单新建.2006.昆仑山Ms8.1地震震源参数的多破裂段模拟研究.地球物理学报,49(2):428-437[DOI:10.3321/j.issn:0001-5733.2006.02.016]
Massonnet D,Rossi M,Carmona C,Adragna F,Peltzer G,Feigl K andRabaute T.1993.The displacement field of the landers earthquakemapped by radar interferometry.Nature,364(6433):138-142[DOI:10.1038/364138a0]
Peltzer G,CrampéF and King G.1999.Evidence of nonlinear elasticityof the crust from the Mw7.6 Manyi(Tibet)earthquake.Science,286(5438):272-276[DOI:10.1126/science.286.5438.272]
Rodriguez E,Morris C S,Belz J E,Chapin E C,Martin J M,Daffe Wand Hensley S.2005.An assessment of the SRTM topographicproducts.Technical Report JPL D-31639.Jet Propulsion Laboratory,Pasadena,California,143 pp
Ryder I,Parsons B,Wright T J and Funning G J.2007.Post-seismicmotion following the 1997 Manyi(Tibet)earthquake:In SAR observations and modelling.Geophysical Journal International,169(3):1009-1027[DOI:10.1111/j.1365-246X.2006.03312.x]
Shen Z K,Sun J B,Zhang P Z,Wan Y G,Wang M,Bürgmann R,Zeng Y H,Gan W J,Liao H and Wang Q L.2009.Slip maxima atfault junctions and rupturing of barriers during the 2008 Wenchuanearthquake.Nature Geoscience,2(10):718-724[DOI:10.1038/NGEO636]
Sun J B,Shen Z K,Xu X W and Bürgmann R.2008.Synthetic normalfaulting of the 9 January 2008 Nima(Tibet)earthquake from conventional and along-track SAR interferometry.Geophysical ResearchLetters,35(22):L22308[DOI:10.1029/2008GL035691]
谭凯,乔学军,游新兆,王琪.2009.改则Ms 6.9地震In SAR同震形变场模拟.大地测量与地球动力学,29(增):1-6
张国宏,屈春燕,单新建,张桂芳,宋小刚,汪荣江,李振洪,胡植庆.2011.2008年Ms7.1于田地震In SAR同震形变场及其震源滑动反演.地球物理学报,54(11):2753-2760[DOI:10.3969/j.issn.0001-5733.2011.11.005]
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