Fig. 2

Geological map of the studied region by Geological Survey of Japan, AIST (2015) with footprint of ALOS-2/PALSAR-2 images (see Fig. 1b). Black and thick green lines are surface trace of active faults and coseismic surface ruptures (Kumahara et al. 2016; Goto et al. 2017; Geological Survey of Japan, AIST 2017), respectively. Location of part of surface rutpures were obtained from maps with WebPlotDigitizer version 4.3 (Rohatgi 2020). Acronyms of active faults and other geological features are as follows; FF: Futagawa fault, HF: Hinagu fault, IF: Idenokuchi fault, MF: Midorikawa fault (AIST 2005). SzF: Suizenji fault, AkF: Akitsugawa flexure (Goto et al. 2017). K.Pl.: Kumamoto Plain, Uto Pen.: Uto Peninsula. Legend of geology: 83: Late Pleistocene to Holocene non-alkaline felsic volcanic rocks, 95: Late Pleistocene to Holocene non-alkaline 26 pyroclastic flow volcanic rocks, 99: Late Pleistocene to Holocene non-alkaline mafic volcanic rocks, 100: Middle Pleistocene non-alkaline mafic volcanic rocks, 84: Middle Pleistocene non-alkaline felsic volcanic rocks, 96: Middle Pleistocene non-alkaline pyroclastic flow volcanic rocks, 101: Early Pleistocene non-alkaline mafic volcanic rocks, 102: Late Miocene to Pliocene non-alkaline mafic volcanic rocks, 166: Holocene non-alkaline mafic volcanic rocks, 123: Middle to Late Miocene felsic plutonic rocks, 130: Early to Late Cretaceous felsic plutonic rocks, 1: Late Pleistocene to Holocene marine and non-marine sediments, 18: Early Cretaceous marine sedimentary rocks, 26: Permian marine sedimentary rocks, 170: Late Pleistocene lower terrace, 171: Late Pleistocene middle terrace, 173: Late Cretaceous non-marine sediments, 44: melange matrix of Early to Late Cretaceous accretionary complex, 60: melange matirx of Early to Middle Jurassic accretionary complex, 77: ultramafic rocks, 190 Holocene reclaimed land (AIST, 2015)