Volcanic subsidence triggered by megathrust earthquakes

Youichiro Takada, Yo Fukushima

Research output: Contribution to journalReview articlepeer-review

2 Citations (Scopus)

Abstract

Studies using spaceborne interferometric synthetic aperture radar (InSAR) analysis showed that two megathrust earthquakes the 2011 Mw9.0 Tohoku-oki earthquake in Japan and the 2010 Mw8.8 Maule earthquake in Chile triggered unprecedented subsidence in multiple volcanoes. There are strong similarities in the characteristics of the surface deformation in Japan and Chile: (1) Maximum subsidence is about 15 cm. (2) Areas of subsidence are elliptically elongated in a north-south direction perpendicular to the principal axis of the extensional stress change. (3) Most of this subsidence is coseismic. These similarities imply that volcanic subsidence triggered by the megathrust earthquakes is a ubiquitous phenomenon. Nonetheless, the mechanism of subsidence is yet to be investigated. Two main hypotheses have been proposed thus far: 1) The localized deformation of hot and weak plutonic bodies. 2) Water release from large hydrothermal reservoirs beneath the volcanoes.

Original languageEnglish
Pages (from-to)373-380
Number of pages8
JournalJournal of Disaster Research
Volume9
Issue number3
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

Keywords

  • InSAR
  • Megathrust earthquake
  • Volcanic subsidence

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Engineering (miscellaneous)

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