Earth Sciences

Fast and slow intraplate ruptures during the 19 October 2020 magnitude 7.6 Shumagin earthquake

Y. Bai, C. Liu, et al.

The M7.6 aftershock of the July 22, 2020 Shumagin earthquake in Alaska surprised researchers by generating a much larger tsunami than the mainshock. With intricate ruptures across multiple faults, this study by Yefei Bai, Chengli Liu, Thorne Lay, Kwok Fai Cheung, and Yoshiki Yamazaki uncovers the complexities behind this unprecedented event, revealing significant tsunamigenic thrust slip that lasted over five minutes, evading traditional seismic detection methods.

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Abstract

The M<sub>w</sub> 7.6 aftershock of the July 22, 2020 M<sub>w</sub> 7.8 Shumagin earthquake, Alaska, generated a much larger tsunami than the mainshock, despite its smaller size and inferred strike-slip mechanism. Analysis of seismic, geodetic, and tsunami data reveals an unprecedented source complexity. This involved fast rupture of two intraplate faults (one below and one above the plate boundary), coupled with slow, strongly tsunamigenic thrust slip on a third fault near the shelf break. This thrust slip lasted over 5 minutes, producing a significant far-field tsunami without clear seismic or geodetic expression.

Publisher

Nature Communications

Published On

Apr 10, 2023

Authors

Yefei Bai, Chengli Liu, Thorne Lay, Kwok Fai Cheung, Yoshiki Yamazaki

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