[M-IS02] Interdisciplinary studies on pre-earthquake processes

[MIS02-13] Multi-sensor monitoring network for earthquake precursors and preparation process near subduction zone at Boso, Japan

*Katsumi HATTORI¹, Peng Han¹, Toru MOGI², Tada-nori GOTO³, Tadashi TAKANO⁴, Jun IZUTSU⁵, Masashi KAMOGAWA⁶, Chihiro YAMANAKA⁷, Ichi TAJUMI⁸, Hiroshi YASUKAWA⁹, Yoshiaki ANDO¹⁰, Jun SONODA¹¹, Hideo SAKAI¹² (1.Graduate School of Science, Chiba University, 2.Hokkaido University, 3.Kyoto University, 4.Nihon University, 5.Chubu University, 6.Tokyo Gakugei Univeristy, 7.Osaka University, 8.Nagoya Institute of Technology, 9.Aichi Prefectural University, 10.The University of Electro-Communications, 11.Sendai National College of Technology, 12.Toyama University)

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, will be incorporated to help to understand the preparation process and evaluate the applicability of various pre-earthquake signals towards short term earthquake forecasting.