Fig. 1From: New hypothesis to explain Quaternary forearc deformation and the variety of plate boundary earthquakes along the Suruga–Nankai Trough by oblique subduction of undulations on the Philippine Sea PlateLocation and topography of the Suruga–Nankai Trough and Southwest Japan. a Location map and plate tectonic setting of the study area. b Tectonic zones of the southwestern Japan arc. MTL, Median Tectonic Line; ISTL, Itoigawa–Shizuoka Tectonic Line. c Shaded topography and bathymetry of Southwest Japan. Red lines are active faults modified from the Active Fault Database of the Geological Survey of Japan (https://gbank.gsj.jp/activefault/). The arrow shows the direction of plate convergenceBack to article page