Research of fault segmentation and grouping using near-surface explorations of active intraplate faults ruptured after a large interplate earthquake

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K01255
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Central Research Institute of Electric Power Industry
• Principal Investigator: Kimura Haruo 一般財団法人電力中央研究所, 地球工学研究所, 主任研究員 (00723652)
• Research Collaborator: AOYAGI Yasuhira (一財)電力中央研究所, 地球工学研究所, 上席研究員 (70371416) ; HIGASHIMARU Naotsugu (一財)電力中央研究所, 地球工学研究所, 派遣職員 ; OHKI Rieka (一財)電力中央研究所, 地球工学研究所, 派遣職員 ; NAKANISHI Toshimichi 京都大学, 理学部附属地球熱学研究施設, 研究員 (10462582) ; TANIGUCHI Kaoru (株)パスコ
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 活断層 / アクティブテクトニクス / 物理探査 / 極浅部地下構造 / 地中レーダ / 丹那断層 / 伊豆半島 / 1930年北伊豆地震

Outline of Final Research Achievements

We conducted 2D and 3D ground penetrating radar (GPR) profiling across the Hakonemachi, Tanna, Sagiriko-b, and Himenoyu faults. These faults except of the Sagiriko-b fault were ruptured during the Mw=6.9 1930 Kita-Izu earthquake. We also carried out drilling survey near the GPR lines, and analyzed the sedimentary facies, magnetic susceptibility, and radiocarbon ages. As a result, near-surface structures of the faults at survey sites were revealed. The Holocene activity recognized in this study of the Sagiriko-b fault has suggested that the fault and 1930 surface ruptures compose an active fault system in late Quaternary.

Free Research Field

構造地質学