Japan Geoscience Union Meeting 2015

Presentation information


Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS28] Active faults and paleoseismology

Thu. May 28, 2015 11:00 AM - 12:45 PM A04 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Takashi AZUMA(National Institute of Advanced Industrial Science and Technology), Nobuhiko Sugito(Faculty of Humanity and Environment, Hosei University), Satoshi Tonai(Department of Applied Science, Faculty of Scienece, Kochi University), Toshikazu Yoshioka(Active Fault and Earthquake Research Center, National Institute of Advanced Industrial Science and Technology), Chair:Toshikazu Yoshioka(Institute of Earthquake and Volcano Geology, National Institute of Advanced Industrial Science and Technology)

11:45 AM - 12:00 PM

[SSS28-15] Examination of submarine active fault off southeast Izu Peninsular, central Japan

*Akihisa KITAMURA1, Shigeto KAWATE2, Yuta MITSUI1, Haeng yoong KIM3 (1.Faculty of Science, Shizuoka University, 2.Graduate School of Science, Shizuoka University, 3.HoSprings Research Institute of Kanagawa Prefecture)

Keywords:submarine active fault, southeast Izu Peninsular, coseismic uplift events, fault model

Faunal compositions and 14C ages of emerged sessile assemblages at four sites in the southern part of Izu Peninsula, central Japan, indicate that co-seismic uplift occurred at 1256-950 BC, AD 1000-1270, AD 1430-1660, and AD 1506-1815 (Kitamura et al., submitted). This study found emerged sessile assemblages at two sites (Kujyuhama and Tarai Cape) which are located at outside of the previous studied area, and examined their faunal compositions and 14C ages. Moreover, we estimated average co-seismic vertical displacement based on combination of previous works and new data obtained in this study. Using these values and source fault model, we examined submarine active fault that caused four uplift events. The results showed that a reversal fault has 12 km length and 15 km width (strike = 70, dip = 25N, slip = 3 m, Mw = 6.7), and is located about 5 km off Shimoda.