Japan Geoscience Union Meeting 2016

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Oral

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG63] Dynamics in mobile belts

Mon. May 23, 2016 3:30 PM - 5:00 PM A08 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Norio Shigematsu(Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Aitaro Kato(Graduate School of Environmental Studies, Nagoya University), Hikaru Iwamori(Geochemical Evolution Research Program, Japan Agency for Marine-Earth Science and Technology), Yasutaka Ikeda(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University), Chair:Takuya NISHIMURA(Disaster Prevention Research Institute, Kyoto University), Kenta Kobayashi(Department of Geology, Faculty of Science, Niigata University)

4:00 PM - 4:15 PM

[SCG63-21] Fold-and-fault structure associated with the Naganoken-hokubu Earthquake in 2014

*Kenta Kobayashi1, Keisuke Iida1, Takuma Katori2 (1.Department of Geology, Faculty of Science, Niigata University, 2.Graduate School of Science and Technology, Niigata University)

Keywords:Nagano Prefecture, Hakuba Village, Otari Village, Kamishiro fault, active fault, fault rocks

We made a geologgical map and geologgical cross sections. We also observed active fault outcrops considered to be related to the Naganoken-hokubu Earthquake in 2014. The Late Miocene to Pliocene strata in this region are separated by NNE-SSW reverse fault (Otari Fault). In the eastern area from the Otari Fault, Late Miocene Yanagisawa Formation is distributed, and subdivided to three members. In the western, Pliocene Hosogai and Iwatoyama Formations are distributed. The Iwatoyama Formation is subdivided to three members. The Hosogai and Iwatoyama Formations consist of syncline (Iwatoyama Syncline), and three members of the Yanagisawa Formation consist of anticline (southern extension of the Hidosawa Anticline) which is cut by the Otari Fault. The hinge lines of the syncline and anticline plunge to the south. The south end of the fold structure is located at the southern margin of the uplift in 2014.