Tomography of the source zone of the great 2011 Tohoku earthquake

Yuanyuan Hua (), Dapeng Zhao (), Genti Toyokuni and Yixian Xu
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Yuanyuan Hua: Tohoku University
Dapeng Zhao: Tohoku University
Genti Toyokuni: Tohoku University
Yixian Xu: Zhejiang University, Hangzhou

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The mechanism and rupture process of the giant 2011 Tohoku-oki earthquake (Mw 9.0) are still poorly understood due to lack of permanent near-field observations. Using seismic arrival times recorded by dense seismograph networks on land and at ocean floor, we determine a detailed seismic tomography model of the megathrust zone beneath the Tohoku forearc. Our results show that the coseismic slip of the 2011 Tohoku-oki earthquake initiated at a boundary between a down-dip high-velocity anomaly and an up-dip low-velocity anomaly. The slow anomaly at shallow depths near the Japan trench may reflect low-rigidity materials that are close to the free surface, resulting in large slip and weak high-frequency radiation. Our new tomographic model can account for not only large slip near the trench but also weak high-frequency radiation from the shallow rupture areas.

Date: 2020
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DOI: 10.1038/s41467-020-14745-8

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