Fig. 5

Linear surface ruptures northwest of the outer rim of Aso caldera. a A high-pass-filtered up–down displacement map made by three-dimensional (3-D) analysis (Morishita et al. 2016) using ALOS-2 image pairs 3, 7, 8, 9 and 10 in Table 1. Red and blue areas represent up and down, respectively. The contour interval is 2 cm. Red solid lines show the identified linear surface ruptures with dip slip where the north side moving down, and blue solid lines show the identified linear surface ruptures with dip slip where the south side moving down. Ticks of the lines show the lower side of each displacement. The area is shown in Fig. 2a. b Red solid lines show the identified linear surface ruptures with dip slip where the north side moving down, and blue solid lines show the identified linear surface ruptures with dip slip where the south side moving down. Ticks of the lines show the lower side of each displacement. Black dashed lines show known active faults (Nakata and Imaizumi 2002; Research group for active tectonics in Kyushu 1989)