著者

笠原 敬司 酒井 慎一 森田 裕一 平田 直 鶴岡 弘 中川 茂樹 楠城 一嘉 小原 一成

出版者

東京大学

雑誌

東京大學地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.84, no.2, pp.71-88, 2010-01-28

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To better assess the seismic hazards produced by a magnitude 7 or greater (M 7+) earthquake in the Tokyo metropolitan area, we have launched the Special Project for Earthquake Disaster Mitigation in Tokyo Metropolitan area (2007−2011). This requires establishing a highly dense seismic-array observation network in and around Tokyo to monitor ongoing micro-earthquakes with relatively high precision even if noise levels are generally high. We have started developing the Metropolitan Seismic Observation network (MeSO-net). Deployment of MeSO-net seismic stations is currently underway. The number of observatories at project termination will be 400 with a 2−5km interval in space. In this paper, we summarize how we solved technically difficult and practical problems involved in MeSO-net construction. We start with a review of related work to better understand the technical difficulties involved in deploying stations in metropolitan areas such as Tokyo. Next, we explain our approach to verifying a meaningful design of an observatory and its deployment at local sites. We further describe our decision-making process in practice for implementing station deployment. We hope that establishing the MeSO-net will support a new assessment of the seismic hazards produced by M 7+ earthquakes in the Tokyo metropolitan area.