Slip model for the 2011 M_w 9.0 Sendai (Japan) earthquake and its M_w 7.9 aftershock derived from GPS data  

作　　者：DIAO FaQi XIONG Xiong NI SiDao ZHENG Yong GE Can 

机构地区：[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

出　　处：《Chinese Science Bulletin》2011年第27期2941-2947,共7页

基　　金：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)

摘　　要：用为 8 h 的测量 GPS 的 coseismic 和 seismic 以后排水量跟随 M w 2011 年 3 月 11 日， coseismic 和 seismic 以后差错的 9.0 仙台地震滑动模型基于一个分层的外壳的模型被开发。主要吃惊的测地学的时刻大小是被测量近似 M w 8.98。slip 展出清楚的反向的特征，与大约 23.3 m 的 hypocenter，和大小附近的最大值。某罢工滑倒行为可以发生在山峰破裂地区的二个方面上。主要吃惊释放的几乎 90% 地震时刻发生在深度不到 40 km。精力由差错释放了在跟随主要吃惊的 8 h 滑倒近似等于 M w 的地震 8.13。与 1.5 m 的最大值， seismic 以后滑倒在 coseismic 破裂差错的西南的部分被集中，它与 M w 的地点和行为同意很好 7.9 余震。这暗示在在主要吃惊以后的 8 h 的 seismic 以后变丑被 M w 主要导致 7.9 余震。另外， seismic 以后 0.20.4 m 滑倒在 coseismic 破裂的下面剧降延期被观察，它可能被在滑倒以后的效果在这个时期期间引起了。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.

关 键 词：GPS数据 余震 滑模式 断层滑动 GPS测量 破裂带 地震矩 地壳模型 

分 类 号：P315[天文地球—地震学]