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
中科院分区:
文献类型:
--
作者:
Lay, Thorne;Ye, Lingling;Kanamori, Hiroo;Satake, Kenji
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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