| 2010年1月12日海地 Mw7.0地震InSAR同震形变观测及同震滑动分布反演 |
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| 引用本文： | 薛莲,孙建宝,沈正康.2010年1月12日海地 Mw7.0地震InSAR同震形变观测及同震滑动分布反演[J].地震地质,2011,33(1):157-174. |
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| 作者姓名： | 薛莲 孙建宝 沈正康 |
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| 作者单位： | 薛莲,沈正康,XUE Lian,SHEN Zheng-kang(北京大学地球物理系,北京,100871;中国地震局地质研究所,地震动力学国家重点实验室,北京,100029);孙建宝,SUN Jian-bao(中国地震局地质研究所,地震动力学国家重点实验室,北京,100029) |
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| 基金项目： | 地震行业科研专项，国家高技术研究发展计划项目 |
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| 摘 要： | 2010年1月12日GMT时间21时53分,在海地境内(72.57°W,18.44°N)发生了Mw7.0地震.文中利用干涉合成孔径雷达(InSAR)方法获得了覆盖整个震区的高精度形变观测资料,用以研究该地震的发震机理.采用ALOs PALSAR数据,分析了轨道、大气等误差源对干涉信号的影响,最终获得了雷达视线向(LOS...
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| 关 键 词： | 海地地震 InSAR同震观测 同震滑动分布反演 |
| 收稿时间： | 2010-06-07 |
| 修稿时间： | 2011-03-08 |
INSAR COSEISMIC DEFORMATION OBSERVATION OF THE JAN 12~(TH),2010 HAITI EARTHQUAKE AND ITS COESEISMIC SLIP DISTRIBUTION INVERSION |
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| XUE Lian,SUN Jian-bao,SHEN Zheng-kang.INSAR COSEISMIC DEFORMATION OBSERVATION OF THE JAN 12~(TH),2010 HAITI EARTHQUAKE AND ITS COESEISMIC SLIP DISTRIBUTION INVERSION[J].Seismology and Geology,2011,33(1):157-174. |
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| Authors: | XUE Lian SUN Jian-bao SHEN Zheng-kang |
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| Affiliation: | XUE Lian1,2) SUN Jian-bao2) SHEN Zheng-kang1,2) 1)Dept of Geophysics,School of Earth and Space Sciences,Peking University,Beijing 100871,China 2)State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China |
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| Abstract: | At 21: 53(GMT)on Jan 12th,2010,an MW 7.1 earthquake struck Haiti with epicenter located at(72.57°W,18.44°N).We derive the high precision Interferometric Synthetic Aperture Radar(InSAR)deformation field covering the whole rupture zone and use the observations to study the seismogenic kinematics of the quake.We analyze the influences of InSAR data errors,such as the orbit errors and atmospheric errors,on the ALOS PALSAR data and finally obtain the coseismic deformation field in the line of sight(LOS)direction.We invert the LOS displacement for the fault geometry of the seismogenic fault and its corresponding slip distribution.We find that the fault dips to the north at 37°,lower than the 70° north-dipping solution from USGS.To test other possible dipping angles of the fault plane and find the best estimate of the fault geometry,we construct an other two fault models.One is modeled with a 70° north-dipping fault plane and the other one is a listric fault model with the hinge depth inverted.Comparing the predicted InSAR interferogram of the three fault models with the observed InSAR coseismic data,we argue that the model with 37° north dipping angle is more rational than the other two models.Our preferred model shows that the coseismic slip concentrates mainly at 4～16km depth,and the maximum slip is 2.8m,appearing at 7.2km depth.The coseismic displacement exhibits both reversal faulting and sinistral strike-slip,suggesting complex fault motion in this earthquake.The moment release of this earthquake is 5.64×1019 Nm,equivalent to an MW 7.1 earthquake. |
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| Keywords: | Haiti Earthquake coseismic InSAR observation coseismic slip distribution inversion |
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