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Subduction earthquakes controlled by incoming plate geometry: The 2020 M>7.5 Shumagin, Alaska, earthquake doublet

Subduction earthquakes controlled by incoming plate geometry: The 2020 M>7.5 Shumagin, Alaska, earthquake doublet

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.epsl.2022.117447. This is version 3 of this Preprint.

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Authors

Yu Jiang, Pablo J. González , Roland Bürgmann

Abstract

In 2020, an earthquake doublet, a M7.8 on July 22nd and a M7.6 on October 19th, struck the Alaska-Aleutian subduction zone beneath the Shumagin Islands. This is the first documented earthquake doublet involving a megathrust event and a strike-slip event. The first event partially ruptured a seismic gap, which has not hosted large earthquakes since 1917, and the second event was unusual as it broke a trench-perpendicular fault within the incoming oceanic slab. We used an improved Bayesian geodetic inversion method to estimate the fault slip distributions of the major earthquakes using Interferometric Synthetic Aperture Radar (InSAR) wrapped ph...  more

DOI

https://doi.org/10.31223/X5H91J

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

slab geometry, Subduction earthquake doublet, Shumagin seismic gap, Alaska subduction zone

Dates

Published: 2021-07-01 11:03

Last Updated: 2022-03-25 19:12

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License

CC BY Attribution 4.0 International