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
中科院分区:
文献类型:
--
作者:
Liu, Chengli;Bai, Yefei;Lay, Thorne;Feng, Yashan;Xiong, Xiong
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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影响因子:
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作者:
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通讯作者:
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影响因子:
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作者:
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作者:
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DOI:
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发表时间:
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期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
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作者:
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通讯作者:
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