Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Oral

S (Solid Earth Sciences) » S-SS Seismology

[S-SS08] Active faults and paleoseismology

Tue. May 22, 2018 10:45 AM - 12:15 PM A07 (Tokyo Bay Makuhari Hall)

convener:Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Hisao Kondo(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Ryosuke Doke(神奈川県温泉地学研究所, 共同), Nobuhisa Matsuta(Okayama University Graduate School of Education), Chairperson:Doke Ryosuke(Hot Springs Research Institute of Kanagawa Prefecture), Azuma Takashi

11:45 AM - 12:00 PM

[SSS08-16] P-wave seismic reflection profiling across the northern part of the Kamishiro fault in the ISTL active fault system, central Japan

*Haruo Kimura1, Yasuhira Aoyagi1, Yasuhiko Akinaga2, Masaki Suehiro2 (1.Central Research Institute of Electric Power Industry, 2.Hanshin Consultants Co., Ltd.)

Keywords:Itoigawa–Shizuoka tectonic line active fault system, Kamishiro fault, active fault, 2014 Nagano earthquake, seismic reflection profiling, subsurface structure

We carried out P-wave seismic reflection profiling to reveal the shallow (about 0–1 km) subsurface structure across the northern part of the Kamishiro fault in the Itoigawa–Shizuoka tectonic line active fault system. Obtained migrated depth-converted section has shown subsurface structures of a main thrust unruptured during the Mw=6.2 2014 Nagano earthquake and branching and back thrusts ruptured during the earthquake.