Tsunami run-up associated with co-seismic thrust slip produced by the 2011 Mw 9.0 Off Pacific Coast of Tohoku earthquake, Japan
Tsunami run-up associated with co-seismic thrust slip produced by the 2011 Mw 9.0 Off Pacific Coast of Tohoku earthquake, Japan
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DOI：
10.1016/j.epsl.2012.04.047
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发表时间：
2012-07
影响因子：
5.3
通讯作者：
A. Lin;R. Ikuta;G. Rao
中科院分区：
文献类型：
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作者：
A. Lin;R. Ikuta;G. Rao
2011年日本东北部太平洋沿岸Mw9.0级地震引发了一场强烈的海啸和意想不到的高海啸波，造成日本本州岛东北部东海岸沿着巨大的破坏和18，940人死亡。对地震前后获得的高分辨率遥感图像数据的分析，结合实地调查的结果，揭示了（i）海啸的上升高度（即，（2）大的上升高度主要出现在2011年Mw9.0级地震震中附近的石卷市（北纬38.2°）和宫古市（北纬40.2°）之间，远离该地区则逐渐减小。结合GPS和地震资料所揭示的地震动方向，得出的助跑高度分布与GPS观测所得的地表位移分布和地震反演所得的震源断层面沿板块边界沿着的同震逆冲滑动分布一致。海啸传播的数值模拟结果表明：（i）海啸波高沿着本州东北海岸线的分布主要受震源断层面上的逆冲滑动的制约;（ii）特定区域的海啸波高受海岸线几何形状的强烈影响。
The 2011 Mw9.0 Off Pacific Coast of Tohoku (Japan) earthquake generated a violent tsunami and unexpected high tsunami wave that caused great substantial damage and ∼18,940 fatalities along the east–northeast coast of Honshu Island of Japan. Analyses of high-resolution remote sensing imagery data acquired before and after the earthquake, combined with the results of field investigations, reveal that (i) run-up height of the tsunami (i.e., the inland limit of tsunami) was spatially variable, ranging from <3m to ∼35m, and (ii) large run-up heights occurred mainly in the areas between Ishinomaki (∼38.2°N) and Miyako city (∼40.2°N), close to the epicenter of 2011 Mw9.0 earthquake, and showed a gradual decrease away from this region. Combined with the ground motion direction revealed by GPS and seismic data, the distribution of run-up height is consistent with that of ground displacement (calculated from GPS observations) and that of co-seismic thrusting slip on the source fault plane along the plate boundary (calculated from the seismic inversion). The results of numerical simulation of tsunami propagation show that (i) the distributions of tsunami height along the northeast Honshu coastline are constrained mainly by thrusting slip on the source fault plane; and (ii) the height of tsunami wave in special areas was strongly affected by the sawtooth geometry of the coastline.