Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long‐Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes

Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long‐Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes
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使用长周期勒夫波辐射模式限制浅层、浅层倾斜推力事件:在 2010 年 10 月 25 日印度尼西亚明打威和 2018 年 5 月 4 日夏威夷岛地震中的应用

DOI:
10.1029/2018gl080042
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发表时间:
2018
影响因子:
5.2
通讯作者:
Satake, Kenji
Satake, Kenji
中科院分区:
地球科学1区
文献类型:
--
作者:
Lay, Thorne;Ye, Lingling;Kanamori, Hiroo;Satake, Kenji

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限制浅层、浅倾逆冲地震的精确断层几何形状是一个常见的挑战。海沟附近的板块边界巨型逆冲断层以及火山岛和推覆体下方的滑脱断层可能仅倾斜几度。长周期点源矩张量波形反演提供了浅层断层倾角的有限分辨率。展开断层的可能性需要精确的倾角估计。对倾角的高灵敏度是由长周期乐夫波振幅方位辐射图提供的,随着倾角从 10° 减小到 0°,它会经历从四瓣到两瓣的快速变化。对乐夫波节点振幅的变化进行建模可以将倾角确定在几度之内。 2010 年 10 月 25 日的明打威 (MWW7.8) 海啸地震和 2018 年 5 月 4 日的夏威夷岛 (MWW6.9) 海啸地震和 2018 年 5 月 4 日的夏威夷岛 (MWW6.9) 海啸地震(导致岛侧下方的 2.5–7.5° 倾角滑脱破裂)均证明了这一点。
Constraining precise faulting geometry for shallow, shallowly dipping thrust earthquakes is a common challenge. Plate boundary megathrust faults near the trench and décollement faults beneath volcanic islands and nappes may dip only a few degrees. Long‐period point source moment tensor waveform inversions provide limited resolution of shallow fault dip angle. The possibility of splay faulting requires precise dip estimation. High sensitivity to dip is provided by long‐period Love wave amplitude azimuthal radiation patterns, which undergo rapid change from four lobed to two lobed as dip decreases from 10° to 0°. Modeling variability in Love wave nodal amplitudes allows the dip to be determined to within a few degrees. This is demonstrated for the 25 October 2010 Mentawai (MWW7.8) tsunami earthquake, which ruptured the 2.0–5.0° dipping megathrust beneath the shallow sedimentary wedge offshore of Indonesia, and the 4 May 2018 Hawaii Island (MWW6.9) thrust earthquake, which ruptured the 2.5–7.5° dipping décollement under the island flank.
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