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[SCG57-25] Kinematic history along the Hinagu fault zone, Kumamoto Prefecture, Kyushu, Japan
Keywords:Kumamoto Prefecture, Hinagu fault, active fault, fault rocks
Brittle fault rock zones were distributed in the Higo metamorphic rocks (Permian-Triassic). NE-SW striking Y surfaces indicated sinistral (early stage) and dextral (late stage) slip senses. NE-SW striking remarkable brittle shear zone was also recognized in the Hinagu Formation (Early Cretaceous), indicated dextral slip sense. On the other hand, ENE-WSW trending fold structures adjacent to the east, indicated sinistral slip sense.
Viewed from the kinematics, the macroscale fault zone in the aftershock area has a long history of deformations. Parts of them were selected, and activated at the time of the 2016 Kumamoto earthquake.