5:15 PM - 6:30 PM
[MIS34-P50] Multiple active faults triggered the 2016 Mw 7.1 Kumamoto earthquakes
Keywords:2016 Mw 7.1 Kumamoto earthquake, co-seismic surface rupture, Hinagu-Futagawa Fault Zone, Aso caldera, co-seismic graben, strike-slip fault
Field investigations, seismic data, and analysis of high-resolution Google earth images acquired before and after the earthquake, reveal that a ~40-km-long surface rupture zone occurred mostly along the NE-SW-striking Hinagu-Futagawa fault zone, with dominantly right-lateral strike-slipping displacement in the central-southwest segment and multiple newly-identified faults in northeast segment that formed a graben structure and crosscut throughout the western side of the Aso caldera. In this presentation, we will report the detail distribution patterns of co-seismic ruptures and offset amounts, and the structural features of the newly found active faults along which the co-seismic surface ruptures occurred.