[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

*服部 克巳¹、Peng Han¹、茂木 透²、後藤 忠徳³、高野 忠⁴、井筒 潤⁵、鴨川 仁⁶、山中 千博⁷、内匠 逸⁸、安川 博⁹、安藤 芳晃¹⁰、園田 潤¹¹、酒井 英男¹² (1.Graduate School of Science, Chiba University、2.北海道大学大学院理学研究院付属地震火山研究観測センター、3.京都大学大学院工学研究科、4.日本大学、5.中部大学、6.東京学芸大学、7.大阪大学、8.名古屋工業大学、9.愛知県立大学、10.電気通信大学、11.仙台高等専門学校、12.富山大学)

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.