[M-IS04] Interdisciplinary studies on pre-earthquake processes

[MIS04-P06] Multi-sensor monitoring network for earthquake precursor study near subduction zone at Boso, Japan

*Katsumi Hattori¹, Chie Yoshino¹, WEIYUN XIE², Sanaka Saito², Haruna Kojima², Rui Song², Peng Han³, Toru Mogi⁴, Tada-nori Goto⁵, Ichi Takumi⁶, Hiroshi Yasukawa⁷, Motoaki Mouri⁸, Jun Izutsu⁹, Tadashi Takano¹⁰, Chihiro Yamanaka¹¹, Masashi Kamogawa¹², Yoshiaki Ando¹³, JANN-YENQ Liu¹⁴, Dimitar Ouzounov¹⁵, Valery Tramutoli¹⁶ (1.Department of Earth Sciences, Graduate School of Science, Chiba University, 2.Graduate School of Science and Engineering, Chiba University, 3.Southern University of Science and Technology, China, 4.Hokkaido University, 5.Kyoto University, 6.Nagoya Institute of Technology, 7.Aichi Prefectural University, 8.Aichi University, 9.Chubu University, 10.Nihon University, 11.Osaka University, 12.Tokyo Gakugei University, 13.The University of Electro-Communications, 14.National Central University, Taiwan, 15.Chapman University, US, 16.University of Basilicagta, Italy)

New observations from ground and space have provided multiple evidences of pre-earthquake signals and the latest studies show their statistical significance, repeatability, and universality. In this project, to understand the preparation process of large earthquakes and slow-slip events in subduction zone, especially to clarify the nucleation stage of the earthquake cycle, we plan to establish a dense observation network in Boso, Japan, where large subduction earthquakes are expected soon. Since the subsurface fluid flow may play an important role in the preparation process of subduction activities, we intend to employ electromagnetic approaches including oceanic and continental MT survey to monitor the underground resistivity structure which is sensitive to the dynamics of fluid. Other geophysical monitoring such as ULF geomagnetic and geoelectrical observations, radon measurements, and inland GPS movements, TIR, and OLR will be incorporated to help to understand the preparation process and evaluate the applicability of various pre-earthquake signals towards short term earthquake forecasting. We call this idea “sensor WEB”. We will show the state of the art and some results in our presentation.
This study is supported by Grand-in-Aids for Scientific Research of Japan Society for Promotion of Science (26249060).