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Summary of Proposal GEO1599

TitleFEM numerical simulation of seismic deformation along Altyn Tagh Fault constrained by InSAR
Investigator Wang, Chisheng - The Hong Kong Polytechnic University, Dep. of Land Surveying and Geo-Informatics
Team Member
Chair Professor Xiaoli, Ding - The Hong Kong Polytechnic University The Hong Kong Polytechnic University, Department of Land Surveying and Geo-Informatics
Mr Yan, Xiangxiang - China Earthquake Administration, Institute of geology
Mr. Jiang, Mi - The Hong Kong Polytechnic University, Department of Land Surveying and Geo-Informatics
SummaryThe large left-lateral Altyn Tagh Fault is a tectonic boundary between the Tibetan plateau and Tarim basin. It acts significant role in accommodating sinistral motion between the Tibetan Plateau and the Tarim block within the India-Eurasia collision zone. On 21 March 2008, Mw 7.1 Yutian earthquake occurred at the southwestern end of Altyn Tagh Fault. On 12 August, 2012, another Mw 6.2 earthquake happened about 80 Km away from Yutian earthquake. Knowing the activity of this fault would have great significance. This study will take an overall study on FEM simulation of InSAR seismic deformation along Altyn Tagh Fault, with mainly three objectives: 1) Use InSAR measurement to gain interseismic deformation of Altyn Tagh Fault, coseismic deformation and postseismic deformation of two Yutian earthquakes; 2) Apply FEM to simulate seismic deformation, and get interseismic slip rate of ATF, slip distribution of Yutian seismogenic faults and rock rheology in the deep; 3) Combine results from this research and background geological resources to draw new knowledge about this region. The algorithm used to process SAR images including 2-pass DInSAR, PS InSAR and SBAS. Coseismic deformation can be generated by 2-pass DInSAR, while post-seismic and inter-seismic deformation may need to use the time-series analysis method like PS InSAR and SBAS. Finite element method is adopted to model the deformation derived from InSAR. However, analytical method, e,g. Okada model, would also be used for comparison. After fulfilling the objectives, this work would bring the following significances: 1) Providing evidences to solve longtime debate on Tibet rheology; 2) Overall understanding FEM simulation of seismic deformation; 3) Developing InSARís application on seismic deformation.

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