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Higa, Nonoka*; Ito, Takashi; Yogi, Mamoru*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; Guguchia, Z.*; Higemoto, Wataru; Nakashima, Miho*; Homma, Yoshiya*; et al.
Physical Review B, 104(4), p.045145_1 - 045145_7, 2021/07
Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)Sato, Toshinori; Aoyagi, Kazuhei; Miyara, Nobukatsu; Aydan, mer*; Tomiyama, Jun*; Morita, Tatsuri*
Proceedings of 2019 Rock Dynamics Summit in Okinawa (USB Flash Drive), p.640 - 645, 2019/05
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.
Kakihana, Masashi*; Nishimura, Kengo*; Takeuchi, Tetsuya*; Haga, Yoshinori; Harima, Hisatomo*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*
Journal of the Physical Society of Japan, 88(4), p.044712_1 - 044712_11, 2019/04
Times Cited Count:4 Percentile:36.25(Physics, Multidisciplinary)Otsuka, Yasunori*; Ishikawa, Takanori*; Tajima, Katsuhiro*; Wada, Tetsu*; Aydan, mer*; Tokashiki, Naohiko*; Sato, Toshinori; Aoyagi, Kazuhei
Journal of Nepal Geological Society, 55(Special Issue), p.1 - 6, 2018/00
Ultrasonic wave reflection intensity of the wall of borehole drilled from bottom of the East Access Shaft in the Horonobe Underground Research Laboratory, Hokkaido, Japan, was obtained using an ultrasonic scanner (USS). In this paper, we compared results of USS observation with core logging data including core observation, optical digital scanner (ODS) observation, and result of Needle Penetration Index (NPI) tests. The results indicated that ultrasonic wave reflection intensity had a good correlation with other observation results. USS observation and NPI tests are useful techniques for determination of detailed rock mass classification.
Kawakita, Yukinobu; Tahara, Shuta*; Nakamura, Mitsutaka; Kikuchi, Tatsuya; Inamura, Yasuhiro; Maruyama, Kenji*; Nakajima, Kenji; Kawamura, Seiko; Yamauchi, Yasuhiro; Kambara, Wataru; et al.
no journal, ,
no abstracts in English
Ozeki, Ryutaro*; Sekino, Kodai*; Suzuki, Tsuyoshi*; Sawai, Kei*; Takemura, Fumiaki*; Kawabata, Kuniaki; Yamashiro, Hideyuki*
no journal, ,
This paper proposed the browsing system and functions for underwater environmental data gathered by wireless sensor network. The discussions were done for the design approaches and implementation examples with gathered data.
Kawakita, Yukinobu; Tahara, Shuta*
no journal, ,
Ikeda, Kohei*; Suzuki, Tsuyoshi*; Yamashiro, Hideyuki*; Takemura, Fumiaki*; Kawabata, Kuniaki
no journal, ,
We develop a wiper device for underwater monitoring sensor nodes. Coral images are gathered by the sensor nodes, but a camera view of the sensor node is interfered by attached algae. Therefore, attached algae are removed by the wiper device. In this paper, we conducted an experiment to confirm the wiper function in the long term operation.