Acta Geodaetica et Cartographica Sinica >

2015 , Vol. 44 >Issue 11: 1202 - 1209

DOI: https://doi.org/10.11947/j.AGCS.2015.20140628

The InSAR Coseismic Deformation Observation and Fault Parameter Inversion of the 2008 Dachaidan Mw6.3 Earthquake

  • LIU Yang ,
  • XU Caijun ,
  • WEN Yangmao ,
  • HE Ping
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  • 1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
    2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;
    3. Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China;
    4. Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaAbstract

Received date: 2014-11-28

  Revised date: 2015-05-27

  Online published: 2015-11-25

Supported by

The National Basic Research Program of China(973 Program)(No.2013CB733304) The National High-tech Research and Development Program of China(863 Program)(No.2013AA122501) The National Natural Science Foundation of China(Nos.414040074143106941204010) The China Postdoctoral Science Foundation(No.2013M542062) The Fundamental Research Funds for the Central Universities(No.2042014kf0055);Surveying and Mapping Basic Research Program of National Administration of Surveying, Mapping and Geoinformation(No.13-02-01)

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Abstract

On November 10, 2008, an Mw6.3 earthquake struck the Dachaidan region of Qinghai Province. The ascending and descending synthetic aperture radar(SAR) data from EnviSat satellite and the differential interferometric SAR(DInSAR) technology are used to extract the coseismic deformation field. The uniform dislocation model is used to determine the fault parameters, the grid iteration method is then used to find the optimal dip angle, and the non-uniform dislocation model is used to obtain the detailed slip distribution simultaneously. The results show that the earthquake uplifts the hanging wall up to~8.5cm and~10cm along the line of sight of the descending and ascending tracks, respectively. The optimal dip angle is 47.9°. The coseismic slip doesn't rupture to the earth surface, and mainly occurs at a depth range from 8.2km to 23.7km, with the maximum and average slip of 0.5m and 0.19m, respectively. The average rake angle is 104.9°. The inverted earthquake moment is 3.74×1018 N·m, and the moment magnitude Mw is 6.35.

Key words： the DachaidanMw6.3 earthquake; InSAR; coseismic deformation; inversion; slip distribution

Cite this article

LIU Yang , XU Caijun , WEN Yangmao , HE Ping . The InSAR Coseismic Deformation Observation and Fault Parameter Inversion of the 2008 Dachaidan Mw6.3 Earthquake[J]. Acta Geodaetica et Cartographica Sinica, 2015 , 44(11) : 1202 -1209 . DOI: 10.11947/j.AGCS.2015.20140628

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