Volcanic eruptions following M ≥ 9 megathrust earthquakes: Implications of the Sumatra-Andaman volcanoes

Thomas R. Walter, Falk C Amelung

Research output: Contribution to journalArticle

115 Citations (Scopus)

Abstract

Two volcanic eruptions in the Sumatra-Andaman are that followed the disastrous M 9.3 earthquake of 26 December 2004 raise the question of whether these eruptions were triggered by the earthquake. Here we present new evidence to suggest that earthquake-induced decompression of the volcano magma systems leads to such eruptions. Numerical modeling reveals that other megathrust earthquakes induced volumetric expansion in the areas where volcanoes erupted. We suggest that abrupt decompression of a magma reservoir and/or its feeding system initiates processes that increase magina overpressure, and can ultimately lead to an eruption. Our evaluation of earthquake-induced deformation fields indicates which specific volcanoes are brought closer to eruption by earthquake rupture. Our analysis can provide important information for future volcanic risk evaluation in areas with regional fault systems prone to large magnitude earthquakes.

Original languageEnglish (US)
Pages (from-to)539-542
Number of pages4
JournalGeology
Volume35
Issue number6
DOIs
StatePublished - Jun 2007

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volcano
volcanic eruption
earthquake
decompression
earthquake rupture
overpressure
earthquake magnitude
magma chamber
magma
modeling
evaluation

Keywords

  • Earthquake
  • Eruption
  • Magma system
  • Stress transfer
  • Volcano triggering

ASJC Scopus subject areas

  • Geology

Cite this

Volcanic eruptions following M ≥ 9 megathrust earthquakes : Implications of the Sumatra-Andaman volcanoes. / Walter, Thomas R.; Amelung, Falk C.

In: Geology, Vol. 35, No. 6, 06.2007, p. 539-542.

Research output: Contribution to journalArticle

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