Megathrust complexity and the up-dip extent of slip during the 2021 Chignik, Alaska Peninsula earthquake

Megathrust complexity and the up-dip extent of slip during the 2021 Chignik, Alaska Peninsula earthquake
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2021 年阿拉斯加半岛奇格尼克地震期间的巨型逆冲复杂性和上倾滑动范围

DOI:
10.1016/j.tecto.2023.229808
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发表时间:
2023
期刊:
影响因子:
2.9
通讯作者:
Xiong, Xiong
Xiong, Xiong
中科院分区:
地球科学2区
文献类型:
--
作者:
Liu, Chengli;Bai, Yefei;Lay, Thorne;Feng, Yashan;Xiong, Xiong

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大规模逆冲断层地震期间的上倾滑动范围对海啸激发和随后的海啸地震潜力都很重要,但目前还不清楚摩擦特性和/或断层结构是否决定了上倾极限。2021 MW8.2奇格尼克,阿拉斯加半岛地震的有限断层滑动模型,通过地震大地测量数据与模型空间范围的约束,从海啸波联合反演提供了异常良好的约束同震滑动的上倾边缘。破裂开始于35公里深,单向向东北扩展,大滑动(高达8.4米)分布在26至42公里的深度范围内的大陆架下。余震集中在具有高库仑应力变化的强逆冲断层反射体周围的同震滑动的上倾。25公里深的上倾边缘的滑动强烈相关的板界面反射率的变化明显的反射剖面,表明结构和摩擦过渡提供了一个障碍,较浅的破裂。
The up-dip extent of slip during large megathrust earthquakes is important for both tsunami excitation and subsequent tsunami earthquake potential, but it is unclear whether frictional properties and/or fault structure determine the up-dip limit. A finite-fault slip model for the 2021MW8.2 Chignik, Alaska Peninsula earthquake obtained by joint inversion of seismic-geodetic data with model spatial extent constraints from the tsunami waves provides unusually good constraints on the up-dip edge of coseismic slip. Rupture initiated ∼35 km deep and propagated unilaterally northeastward with large-slip (up to 8.4 m) distributed over a depth range of 26 to 42 km beneath the continental shelf. Aftershocks concentrate up-dip of the coseismic slip around a strong megathrust reflector with high Coulomb stress change. The ∼25 km deep up-dip edge of slip strongly correlates with a change in plate interface reflectivity apparent in reflection profiles, indicating that a structural and frictional transition provided a barrier to shallower rupture.
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