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co-seismic fault geometry and slip distribution of the 26 December 2004, giant sumatra–andaman earthquake constrained by GPS, coral reef, and remote sensing data

引用

earthquake Science 2015年第3期28卷 187-195页

作者： Yongge Wan Zheng-kang Shen Min Wang Yuehua Zeng Jichao Huang Xiang Li Huawei Cui Xiwei Gao Institute of Disaster-Prevention Department of Earth and Space Sciences University of California Institute of Geology China Earthquake Administration U.S.Geology Survey

We analyze co-seismic displacement field of the 26 December 2004, giant sumatra–andaman earthquake derived from Global Position System observations,geological vertical measurement of coral head, and pivot line observed through remote sensing. Using the co-seismic displacement field and AK135 spherical layered Earth model, we invert co-seismic slip distribution along the seismic fault. We also search the best fault geometry model to fit the observed data. Assuming that the dip angle linearly increases in downward direction, the postfit residual variation of the inversed geometry model with dip angles linearly changing along fault strike are plotted. The geometry model with local minimum misfits is the one with dip angle linearly increasing along strike from 4.3oin top southernmost patch to 4.5oin top northernmost path and dip angle linearly increased. By using the fault shape and geodetic co-seismic data, we estimate the slip distribution on the curved fault. Our result shows that the earthquake ruptured ＊200-km width down to a depth of about 60 km.0.5–12.5 m of thrust slip is resolved with the largest slip centered around the central section of the rupture zone78N–108N in latitude. The estimated seismic moment is8.2 9 1022 N m, which is larger than estimation from the centroid moment magnitude（4.0 9 1022 N m）, and smaller than estimation from normal-mode oscillation data modeling（1.0 9 1023 N m）.

关键词： sumatra–andaman earthquake fault geometry co-seismic slip distribution geodetic data

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