Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Tae-Kyung Hong, Junhyung Lee, Soung Eil Houng

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Megathrusts produce large permanent lithospheric displacements as well as strong transient ground shaking up to regional distances. The influence of the 2011 M9.0 Tohoku-Oki earthquake on the seismicity in stable intraplate regions around the Korean Peninsula is investigated. The differential lateral displacements by the megathrust build transient radial tension field over the backarc lithosphere, constructing stress shadows for all types of faults in optimal orientation over the wide backarc region including the southern Korean Peninsula. A characteristic seismic-velocity decrease after the megathrust supports the medium relaxation. The number of earthquakes with magnitudes greater than or equal to 2.5 was increased by 61%. after the megathrust. The earthquakes occurred episodically. A series of unusual earthquake swarms and a temporal cluster of moderate-size earthquakes were observed in the Yellow Sea region. The significant seismicity increase since the megathrust may be due to the fluid diffusion during the transient tension field and the pore-fluid pressure increase during the ambient compressional-stress field recovery by tectonic loading. The induced seismicity may continue until the ambient stress field is fully recovered.

Original languageEnglish
Pages (from-to)59-70
Number of pages12
JournalPhysics of the Earth and Planetary Interiors
Volume245
DOIs
Publication statusPublished - 2015 Aug 1

Fingerprint

seismicity
earthquakes
earthquake
stress field
Tohoku earthquake 2011
peninsulas
induced seismicity
earthquake swarm
stress distribution
fluid pressure
seismic velocity
pore pressure
lithosphere
shaking
tectonics
fluid
recovery
porosity
fluids
sea

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

Cite this

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abstract = "Megathrusts produce large permanent lithospheric displacements as well as strong transient ground shaking up to regional distances. The influence of the 2011 M9.0 Tohoku-Oki earthquake on the seismicity in stable intraplate regions around the Korean Peninsula is investigated. The differential lateral displacements by the megathrust build transient radial tension field over the backarc lithosphere, constructing stress shadows for all types of faults in optimal orientation over the wide backarc region including the southern Korean Peninsula. A characteristic seismic-velocity decrease after the megathrust supports the medium relaxation. The number of earthquakes with magnitudes greater than or equal to 2.5 was increased by 61{\%}. after the megathrust. The earthquakes occurred episodically. A series of unusual earthquake swarms and a temporal cluster of moderate-size earthquakes were observed in the Yellow Sea region. The significant seismicity increase since the megathrust may be due to the fluid diffusion during the transient tension field and the pore-fluid pressure increase during the ambient compressional-stress field recovery by tectonic loading. The induced seismicity may continue until the ambient stress field is fully recovered.",
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Long-term evolution of intraplate seismicity in stress shadows after a megathrust. / Hong, Tae-Kyung; Lee, Junhyung; Houng, Soung Eil.

In: Physics of the Earth and Planetary Interiors, Vol. 245, 01.08.2015, p. 59-70.

Research output: Contribution to journalArticle

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