The Dynamic response of Horonobe Underground Research Center during the 2018 June 20 earthquake

2018年6月20日に発生した地震による幌延深地層研究所における動的反応

佐藤 稔紀  ; 青柳 和平  ; 宮良 信勝; 藍壇 オメル*; 富山 潤*; 盛田 樹里*

Sato, Toshinori; Aoyagi, Kazuhei; Miyara, Nobukatsu; Aydan, mer*; Tomiyama, Jun*; Morita, Tatsuri*

2018年6月20日に宗谷地方を震源とする地震が発生し、幌延町では深度4が観測された。幌延深地層研究所に設置された地震計や、防災科技研が設置したKik-NetやK-Netにより地震動が観測された。この地震動について周波数特性や増幅特性について解析され、さらに地層処分の安全性について検討を行った。

An earthquake with a moment magnitude of 4 occurred in June 20, 2018, which is also named as the 2018 June 20 Soya Region earth-quake. The strong motions induced by this earthquake were recorded by the accelerometers installed in the Horonobe URL as well as the Kik-Net and K-Net strong motions networks operated by the National Research Institute for Earth Science and Disaster Prevention of Japan. The authors explain the results of the analyses carried out on the ground amplification and frequency characteristics of the acceleration records at the Horonobe URL and those of the Kik-net strong motion station and the structural effect of the URL on the ground amplification and frequency characteristics. Furthermore, the authors discuss the implications of the results obtained from this study in practice and the safety of the nuclear waste disposal at depth.