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Coseismic rupturing stopped by Aso volcano during the 2016 Mw 7.1 Kumamoto earthquake, Japan

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Science  20 Oct 2016:
aah4629
DOI: 10.1126/science.aah4629

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Abstract

Field investigations and seismic data show that the 16 April 2016 Mw 7.1 Kumamoto earthquake produced a surface rupture zone of ~40 km long along the NE–SW-striking strike-slip Hinagu–Futagawa Fault Zone, and newly identified faults on the western side of Aso caldera, Kyushu Island, Japan. The coseismic surface ruptures cut Aso caldera and two volcanic cones inside the caldera, but terminate in the caldera. The findings show that northeastward propagation of coseismic rupturing terminated in Aso caldera because of the presence of magma beneath the Aso volcanic cluster. The seismogenic faults of the 2016 Kumamoto earthquake may require reassessing the volcanic hazard in the vicinity of Aso volcano.

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