Coseismic rupturing stopped by Aso volcano during the 2016 M-w 7.1 Kumamoto earthquake, Japan

摘要

Field investigations and seismic data show that the 16 April 2016 moment magnitude (M-w) 7.1 Kumamoto earthquake produced a similar to 40-kilometer-long surface rupture zone along the northeast-southwest-striking Hinagu-Futagawa strike-slip fault zone and newly identified faults on the western side of Aso caldera, Kyushu Island, Japan. The coseismic surface ruptures cut Aso caldera, including two volcanic cones inside it, but terminate therein. The data 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 reassessment of the volcanic hazard in the vicinity of Aso volcano.