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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)10,997-11,003
JournalGeophysical Research Letters
Volume44
Issue number21
DOIs
Publication statusPublished - 2017 Nov 16

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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