奈良盆地東縁断層帯における重点的な調査観測による地下構造調査

Abstract

The Nara-Bonchi-Toen active fault system is defined as the south part of the Kyoto-Bonchi-Nara-Bonchi active fault zone that running along the eastern margin of the Yamashina, Kyoto, Yamashiro, and Nara basins in Kinki area. Our research group conducted comprehensive research of this active fault zone in 2019-2021FY to obtain the information for developing the long-term earthquake evaluation and the strong ground motion prediction. Here we explain the results of the seismic reflection surveys and the borehole experiments conducted in this research program and indicate several findings on the shallow part of the active fault and characteristics of the sediments of the Kyoto and Nara basin area.