A unified source model for the 2011 Tohoku earthquake
A unified source model for the 2011 Tohoku earthquake
复制标题
DOI：
10.1016/j.epsl.2011.09.009
复制
发表时间：
2011-10-15
影响因子：
5.3
通讯作者：
Okada, Tomomi
中科院分区：
文献类型：
--
作者：
Koketsu, Kazuki;Yokota, Yusuke;Okada, Tomomi
2011年东北大地震是由密集的地球物理仪器网络观测到的。通过地震、强震和大地测量数据的联合反演，建立了统一的震源模型。结果表明，这次地震由三个主要破裂组成。第一次破裂在经历了最初50 s的小破裂后，以1. 8 km/s的缓慢速度向东北和东方向扩展。第二次破裂开始于20 s后，最慢速度为1.5 km/s，最大滑动量为36 m。第三次破裂起主导作用，以2.5 km/s的速度向南传播。只有海啸反转需要源断层延伸到第一破裂区和日本海沟之间的浅部，恢复大于40米的海啸滑动。慢破裂速度和海啸滑动可以解释地震灾害的特点。(C)2011 Elsevier B. V.保留所有权利。
The devastating 2011 Tohoku earthquake was observed by dense networks of geophysical instruments. A unified source model was constructed through joint inversion of teleseismic, strong motion, and geodetic datasets. The result indicates that the earthquake consists of three main ruptures. After small rupture in the initial 50 s, the first rupture expanded at a slow speed of 1.8 km/s to the northeast and east. The second rupture began 20 s later at the slowest speed of 1.5 km/s and became dominant with the largest slip of 36 m. The third rupture then played the leading role, propagating southward at a speed of 2.5 km/s. Only the tsunami inversion requires an extension of the source fault to a shallow part between the first rupture area and the Japan Trench, recovering tsunamigenic slips larger than 40 m. The slow rupture speed and tsunamigenic slips can explain the features of the disaster by the earthquake. (C) 2011 Elsevier B.V. All rights reserved.