Fig. 5

a Phase gradient map calculated from interferogram of InSAR pair 1. Solid curves indicate active faults cataloged in the digital map of active faults (Nakata and Imaizumi, 2002). Dashed curves indicate lineaments with high phase gradients identified in areas where an active fault has not been cataloged. Gray color shows low coherence area due to large deformation. b Locations of lineaments with high phase gradients superposed on topographic relief map