[H-GM03] Geomorphology

[HGM03-P10] Geomorphic analysis of the active fault in volcanic area based on GIS

*Daisaku Kawabata¹, Haruo Kimura², Yasuhira Aoyagi² (1.Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 2.Central Research Institute of Electric Power Industry)

Keywords:geomorphic analysis, GIS, active fault

The movement of active faults due to inland earthquakes often involves surface displacement. In Japan, where many active faults are distributed, fault displacements are often accumulated and effected on the current topography. However, volcanic rock areas in Japan are difficult to find evidence of fault activity accumulation in the terrain, and it is difficult to find fault traces on the surface. In this study, in order to investigate the characteristics of the river topography around the active fault, geomorphic analysis was examined using a high-precision DEM of the southern region of Iwate Prefecture based on GIS. The target area is mainly covered by Miocene to Pleistocene volcanic rocks. In this area, despite significant earthquakes occurring since 1896, there is little apparent surface displacement. This study clarified the details of the geomorphic quantity of the target area. As a result, SPI value tends to be higher in the area where surface displacement was observed in 2008.