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Tomography of the source zone of the great 2011 Tohoku earthquake

Earth Sciences

Tomography of the source zone of the great 2011 Tohoku earthquake

Y. Hua, D. Zhao, et al.

This groundbreaking research by Yuanyuan Hua, Dapeng Zhao, Genti Toyokuni, and Yixian Xu reveals critical insights into the megathrust zone beneath the Tohoku forearc, shedding light on the mechanisms behind the 2011 Tohoku-oki earthquake. Discover how coseismic slip initiated at the boundary of contrasting seismic velocities and the implications of a shallow low-velocity anomaly.

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Playback language: English
Abstract
Using seismic arrival times from dense land and ocean floor networks, this study constructs a detailed seismic tomography model of the megathrust zone beneath the Tohoku forearc to understand the 2011 Tohoku-oki earthquake (Mw 9.0). Results show coseismic slip initiated at a boundary between a down-dip high-velocity and an up-dip low-velocity anomaly. The shallow low-velocity anomaly near the Japan trench, possibly reflecting low-rigidity materials, explains the large slip and weak high-frequency radiation observed.
Publisher
Nature Communications
Published On
Mar 03, 2020
Authors
Yuanyuan Hua, Dapeng Zhao, Genti Toyokuni, Yixian Xu
Tags
seismic tomography
Tohoku-oki earthquake
megathrust zone
coseismic slip
velocity anomalies
seismic radiation
Japan trench

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