基于敏感度的迭代拟合法反演玛尼Ms7.9级地震滑动分布
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摘要
1997年11月8日,西藏玛尼地区发生了Ms 7.9级地震。利用欧空局的ERS2卫星获取的干涉同震形变场,结合提取到的断层地表位置,基于弹性半空间位错模型,采用基于敏感度迭代拟合法反演获取了玛尼地震的精细滑动分布。结果表明,断层面最大滑动量为6.78 m,主要的滑动量分布在沿断层走向的12~112km之间,主要分布深度为0~16 km,反演得到的地震矩为2.01×1020Nm(Mw 7.50)。
On November 8,1997,a Ms 7.9 Manyi earthquake was occurred in Qinghai-Tibet.Using InSAR cosesimic deformation acquired by ESA ERS2 satellite,and combining with the fault trace derived form the correlation data and azimuth offset map and basing on dislocation model in elastic half-space,we derive the slip distribution by utilizing a sensitivity-based iterative fitting method.Distributed-slip model indicates that the cosesimic slip reaches about 6.78 m.The slip is concentrate to 12-112 km along the strike direction,with most of the moment release located on the shallow part above 16 km depth.The geodetic estimate of seismic moment is 2.01×1020 Nm(Mw 7.50),is consistent with seismic estimates.
On November 8,1997,a Ms 7.9 Manyi earthquake was occurred in Qinghai-Tibet.Using InSAR cosesimic deformation acquired by ESA ERS2 satellite,and combining with the fault trace derived form the correlation data and azimuth offset map and basing on dislocation model in elastic half-space,we derive the slip distribution by utilizing a sensitivity-based iterative fitting method.Distributed-slip model indicates that the cosesimic slip reaches about 6.78 m.The slip is concentrate to 12-112 km along the strike direction,with most of the moment release located on the shallow part above 16 km depth.The geodetic estimate of seismic moment is 2.01×1020 Nm(Mw 7.50),is consistent with seismic estimates.
引文
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[4]孙建宝,石耀霖,沈正康,等.基于线弹性位错模型反演1997年西藏玛尼Mw 7.5级地震的干涉雷达同震形变场———II滑动分布反演[J].地球物理学报,2007,50(5):1 390-1 397
[5]许才军,温扬茂.基于InSAR数据的西藏玛尼Ms7.9级地震的地壳不均匀性研究[J].武汉大学学报.信息科学版,2008,33(8):846-849
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[8]鄢子平,李振洪.InSAR大气水汽改正模型的比较应用研究[J].武汉大学学报.信息科学版,2008,33(7):723-726
[9]徐锡伟,宋方敏,杨晓平,等.中国大陆地表破裂型潜在震源区的地震地质学综合判断[J].震情研究,2000,44(1):14-26
[10]Okada Y.Internal Deformation Due to Shear andTensile Faults in a Half-space[J].Bulletin of theSeismological Society of America,1992,82(2):1018-1 040
[11]Wang Rongjiang,Motagh M,Walter T R.Inver-sion of Slip Distribution from Co-seismic Deforma-tion Data by a Sensitivity-based Iterative FittingMethod[C].EGU General Assembly,Reykjavik,Iceland,2008
[12]Pritchard M,Simons M,Rosen P,et al.CoseismicSlip from the July 30,1995,Mw=8.1 Antofagas-ta,Chile,Earthquake as Constrained by InSAR andGPS Observations[J].Geophysical Journal Interna-tional,2002,150:362-376
[13]Carroll D.Chemical Laser Modeling with GeneticAlgorithm[J].AIAA Journal,1996,34(2):338-346
[14]Aster R,Borchers B,Thurber C.Parameter Esti-mation and Inverse Problems[M].London:Aca-demic Press,2004:35-36
[2]Funning G,Parsons B,Wright T J.Fault Slip inthe 1997 Manyi,Tibet Earthquake from Linear E-lastic Modelling of InSAR Displacement[J].Geo-physical Journal International,2007,169:988-1 008
[3]Wang Hua,Xu Caijun,Ge Linlin.Coseismic De-formation and Slip Distribution of the 1997 Mw 7.5Manyi,Tibet,Earthquake from InSAR Measure-ments[J].J Geodyn,2007,44:200-212
[4]孙建宝,石耀霖,沈正康,等.基于线弹性位错模型反演1997年西藏玛尼Mw 7.5级地震的干涉雷达同震形变场———II滑动分布反演[J].地球物理学报,2007,50(5):1 390-1 397
[5]许才军,温扬茂.基于InSAR数据的西藏玛尼Ms7.9级地震的地壳不均匀性研究[J].武汉大学学报.信息科学版,2008,33(8):846-849
[6]Scharroo R,Wisser P.Precise Orbit Determinationand Gravity Field Improvement for the ERS Satellite[J].J Geophys Res,1998,103(C4):8 113-8 127
[7]Farr M,Kobrick M.Shuttle Radar TopographyMission Produces a Wealth of Data[J].EOS Trans-actions of the AGU,2000,81:583-585
[8]鄢子平,李振洪.InSAR大气水汽改正模型的比较应用研究[J].武汉大学学报.信息科学版,2008,33(7):723-726
[9]徐锡伟,宋方敏,杨晓平,等.中国大陆地表破裂型潜在震源区的地震地质学综合判断[J].震情研究,2000,44(1):14-26
[10]Okada Y.Internal Deformation Due to Shear andTensile Faults in a Half-space[J].Bulletin of theSeismological Society of America,1992,82(2):1018-1 040
[11]Wang Rongjiang,Motagh M,Walter T R.Inver-sion of Slip Distribution from Co-seismic Deforma-tion Data by a Sensitivity-based Iterative FittingMethod[C].EGU General Assembly,Reykjavik,Iceland,2008
[12]Pritchard M,Simons M,Rosen P,et al.CoseismicSlip from the July 30,1995,Mw=8.1 Antofagas-ta,Chile,Earthquake as Constrained by InSAR andGPS Observations[J].Geophysical Journal Interna-tional,2002,150:362-376
[13]Carroll D.Chemical Laser Modeling with GeneticAlgorithm[J].AIAA Journal,1996,34(2):338-346
[14]Aster R,Borchers B,Thurber C.Parameter Esti-mation and Inverse Problems[M].London:Aca-demic Press,2004:35-36
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