Seismic Velocity Changes in the Backarc Continental Crust After the 2011 Mw 9.0 Tohoku-Oki Megathrust Earthquake

Tae Kyung Hong; Junhyung Lee; Donggeun Chi; Seongjun Park

doi:10.1002/2017GL075447

Seismic Velocity Changes in the Backarc Continental Crust After the 2011 M_w 9.0 Tohoku-Oki Megathrust Earthquake

Tae Kyung Hong, Junhyung Lee, Donggeun Chi, Seongjun Park

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The 2011 M_w 9.0 Tohoku-Oki megathrust earthquake accompanied coseismic and postseismic displacements around the eastern Eurasian continental plate. Noise cross correlations produced transient seismic waveforms along interstation paths in the Korean Peninsula. We measured the traveltime changes of the fundamental mode Rayleigh waves over the range of 0.03–0.08 Hz after the megathrust earthquake. The temporal seismic velocity changes in the lower crust were assessed from the traveltime changes. The traveltimes increased instantly after the megathrust earthquake and were gradually recovered over several hundreds to thousands of days. The instant shear wave velocity decreases ranged between 0.731 (±0.057)% and 4.068 (±0.173)%. The temporal medium perturbation might be caused by the transient uniaxial tensional stress due to the coseismic and postseismic displacements. The medium properties may be recovered by progressive stress field reconstruction.

Original language	English
Pages (from-to)	10,997-11,003
Journal	Geophysical Research Letters
Volume	44
Issue number	21
DOIs	https://doi.org/10.1002/2017GL075447
Publication status	Published - 2017 Nov 16

Bibliographical note

Funding Information:
Most analysis results are presented in the supporting information. The continuous seismic waveform records and station information are available from Korea Meteorological Administration (necis.kma.go.kr). The authors are grateful to Andrew Newman (Editor) and two anonymous reviewers for valuable review comments that improved the presentation of this manuscript. This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMIPA 2015-7040. In addition, this research was partly supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A6A1A07015374).

Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.

All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

Access to Document

10.1002/2017GL075447

Cite this

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title = "Seismic Velocity Changes in the Backarc Continental Crust After the 2011 Mw 9.0 Tohoku-Oki Megathrust Earthquake",

abstract = "The 2011 Mw 9.0 Tohoku-Oki megathrust earthquake accompanied coseismic and postseismic displacements around the eastern Eurasian continental plate. Noise cross correlations produced transient seismic waveforms along interstation paths in the Korean Peninsula. We measured the traveltime changes of the fundamental mode Rayleigh waves over the range of 0.03–0.08 Hz after the megathrust earthquake. The temporal seismic velocity changes in the lower crust were assessed from the traveltime changes. The traveltimes increased instantly after the megathrust earthquake and were gradually recovered over several hundreds to thousands of days. The instant shear wave velocity decreases ranged between 0.731 (±0.057)% and 4.068 (±0.173)%. The temporal medium perturbation might be caused by the transient uniaxial tensional stress due to the coseismic and postseismic displacements. The medium properties may be recovered by progressive stress field reconstruction.",

author = "Hong, {Tae Kyung} and Junhyung Lee and Donggeun Chi and Seongjun Park",

note = "Funding Information: Most analysis results are presented in the supporting information. The continuous seismic waveform records and station information are available from Korea Meteorological Administration (necis.kma.go.kr). The authors are grateful to Andrew Newman (Editor) and two anonymous reviewers for valuable review comments that improved the presentation of this manuscript. This work was supported by the Korea Meteorological Administration Research and Development Program under grant KMIPA 2015-7040. In addition, this research was partly supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A6A1A07015374). Publisher Copyright: {\textcopyright}2017. American Geophysical Union. All Rights Reserved.",

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