[S-SS28] Active faults and paleoseismology

[SSS28-P11] Surface rupture of the 2014 Kamishiro fault earthquake

*Daisuke HIROUCHI¹, Nobuhiko SUGITO², Heitaro KANEDA³, Hideaki GOTO⁴, Nobuhisa MATSUTA⁵, Yasuhiro SUZUKI⁶, Satoshi ISHIGURO⁷, Yasuhiro KUMAHARA⁴, RESEARCH, Group GEOMORPHOLOGICAL¹ (1.Shinshu Univ., 2.Housei Univ., 3.Chiba Univ., 4.Hiroshima Univ., 5.Okayama Univ., 6.Nagoya Univ., 7.National Institute for Envronmental Studies)

Keywords:The 2014 Kamishiro fault earthquake, surface rupture, ISTL active fault zone

The Kamishiro fault is located in the northernmost part of the 150-km-long Itoigawa-Shizuoka Tectonic Line (ISTL) active fault zone, central Japan. Immediately after the destructive Mj 6.7 earthquake of November 22, 2014, which occurred in the northern part of the Nagano Prefecture, we conducted field reconnaissance surveys, and found coseismic surface ruptures exactly along the northern part of the reverse-faulting Kamishiro fault. Based on our surveys, in addition to the reports of other universities or research institutes, primary coseismic surface ruptures extend for ca. 9 km, most of which runs along the previously-identified active fault traces (Research Group for ISTL Tectonic Landforms, 2007; Suzuki et al., 2009, 2010). Various methodologies to record the surface ruptures have been applied until now, including aerial photographs, UAV and high-pole SfM, TLS (Terrestrial Laser Scanner), AL (Auto Level), and TS (Total Station), as reported in other presentations.