Slip model for the 2011 M_w 9.0 Sendai (Japan) earthquake and its M_w 7.9 aftershock derived from GPS data |
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作者姓名: | DIAO FaQi XIONG Xiong NI SiDao ZHENG Yong GE Can |
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作者单位: | [1]Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China [2]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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基金项目: | supported by the Knowledge Innovation Key Program of the Chinese Academy of Sciences (KZCX2-SW-142) the National Natural Science Foundation of China (41021003, 40974034 and 90814009) the Key Project of Earthquake Science (201008007) |
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摘 要: | Using GPS-measured coseismic and post-seismic displacements for the 8 h following the M w 9.0 Sendai earthquake of March 11, 2011, coseismic and post-seismic fault slip models were developed based on a layered crustal model. The geodetic moment magnitude of the main shock was measured as approximately M w 8.98. The slip exhibits clear reverse characteristics, with a maximum near the hypocenter, and a magnitude of about 23.3 m. Some strike-slip behavior may occur on the two sides of the peak rupture zone. Almost 90% of the seismic moments released by the main shock occurred at depths less than 40 km. The energy released by the fault slip in the 8 h following the main shock is approximately equal to an earthquake of M w 8.13. With a maximum of ~1.5 m, the post-seismic slip was concentrated in the southwestern part of the coseismic rupture fault, which agrees well with the location and behavior of the M w 7.9 aftershock. This implies that the post-seismic deformation in the 8 h after the main shock was mainly induced by the M w 7.9 aftershock. In addition, a post-seismic slip of 0.2-0.4 m was observed at the down-dip extension of the coseismic rupture, which may have been caused by the effect of after-slip during this period.
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关 键 词: | great subduction zone earthquake slip model inversion large aftershock GPS data |
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