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

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

*服部 克巳¹、吉野 千恵¹、謝 蔚云²、齊藤 央²、小島 春奈²、宋 鋭²、韓 鵬³、茂木 透⁴、後藤 忠徳⁵、内匠 逸⁶、安川 博⁷、毛利 元昭⁸、井筒 潤⁹、高野 忠¹⁰、山中 千博¹¹、鴨川 仁¹²、安藤 芳晃¹³、劉 正彦¹⁴、Ouzounov Dimitar¹⁵、Tramutoli Valery¹⁶ (1.千葉大学大学院理学研究院、2.千葉大学大学院融合理工学府、3.中国南方科技大学、4.北海道大学、5.京都大学、6.名古屋工業大学、7.愛知県立大学、8.愛知大学、9.中部大学、10.日本大学、11.大阪大学、12.東京学芸大学、13.電気通信大学、14.台湾国立中央大学、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).