Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Areas 【 display / non-display 】

Research Areas 【 display / non-display 】

Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Surface Geological Characteristics off the Southeastern Boso Peninsula Based on Seismic Facies Classification

  米山岬,古山精史朗,中東和夫,萩田隆一,田淵圭,五月女勇輝 , 2026.02

  Journal of the Tokyo University of Marine Science and Technology

• Spatiotemporal variation of aftershock activity in northern source region of the 2011 Tohoku-oki earthquake by long-term ocean bottom seismometers

  Masanao Shinohara, Ryota Hino, Kimihiro Mochizuki, Toshinori Sato, Kazuo Nakahigashi, Tomoaki Yamada, Yoshio Murai, Hiroshi Yakiwara, Yoshihiro Ito, Ryosuke Azuma, Toshihiko Kanazawa , 2025.05

  Progress in Earth and Planetary Science

• Precise aftershock activity in the marine source region of the 2024 Noto-Hanto earthquake by rapid response observation using ocean bottom seismometers

  Masanao Shinohara, Ryota Hino, Tsutomu Takahashi, Koichiro Obana, Shuichi Kodaira, Ryosuke Azuma, Tomoaki Yamada, Takeshi Akuhara, Yusuke Yamashita, Eiji Kurashimo, Yoshio Murai, Takehi lsse, Kazuo Nakahigashi, Hisatoshi Baba, Yusaku Ohta, Yoshihiro Ito, Hiroshi Yakiwara, Yukihiro Nakatani, Gou Fujie, Toshinori Sato, Hajime Shiobara, Kimihiro Mochizuki, Shin’ichi Sakai , 2025.04

  Earth Planets Space

  DOI

• Characteristics of bathymetry and subseafloor geological structure of shelf slope basin off the south-eastern Boso Peninsula

  伊奈 新起, 古山 精史朗, 中東 和夫, 宮崎 唯史, 上嶋 紘生, 加持 恵達 , 2025.02

  Journal of the Tokyo University of Marine Science and Technology

• Shallow structure and late quaternary slip rate of the Osaka Bay fault, western Japan

  Mari Hamahashi, Hironori Otsuka, Yoshiaki Suzuki, Jun Arimoto, Tetsuo Matsuno, Nobukazu Seama, Yuzuru Yamamoto, Hiroko Sugioka, Stephen A. Bowden, Satoshi Shimizu, Hikaru Iwamaru, Mamoru Sano, Keita Suzuki, Katsuya Kaneko, Kazuo Nakahigashi, Yoshiyuki Tatsumi , 2024.02

  Progress in Earth and Planetary Science

  DOI

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Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• 0

  Project Period (FY)： 2026/04  -  2029/03  Investigator(s): 中東 和夫

  Grant-in-Aid for Scientific Research(C)  Principal Investigator  26K08925 

• 男女海盆を波源域とする津波発生の可能性評価

  Project Period (FY)： 2022/04  -  2026/03  Investigator(s): 中東和夫

  Grant-in-Aid for Scientific Research(C)  Principal Investigator  22K03775 

• Development of acoustic data transmission for real-time tsunami observation

  Project Period (FY)： 2020/04  -  2023/03  Investigator(s): Takaahshi Narumi

  Grant-in-Aid for Scientific Research(B)  Co-Investigator  20H02104 

  In this study, we developed acoustic transmission for sea bottom pressure data in real-time. It is difficult for real-time tsunami observation around Japan without an infrastructure like ocean bottom cable as the background. Considering long term observation by super low electric consumption, the digital data is converted to a length between double pulses and sent by acoustic transmission adding improved noise resistance performance. Assuming that sea bottom pressure data is sent to buoy on sea surface and/or after relay among some equipment, it has a function to send some stations data. Here, we established underwater acoustic transmission technology by repeating experiments in Lake Tazawa and sea trials to evaluate data transmission accuracy using the adopted frequency and noises like reflected or scattered signals. Reliability of element used for acoustic transmission at deep ocean is to be resolved in the future.

• Relationship between the upper mantle structure of the Okinawa Trough, large earthquake in the back-arc basin, and expansion of the back-arc basin

  Project Period (FY)： 2018/04  -  2022/03  Investigator(s): nakahigashi kazuo

  Grant-in-Aid for Scientific Research(B)  Principal Investigator  18H01306 

  Five seafloor seismometers were deployed around the Danjyo Basin, located in the northern part of the Okinawa Trough. As a result of hypocenter relocation using the obtained seafloor seismic data and remote island observation data, it was found that the distribution of hypocenters around the Danjyo Basin tends to be linearly aligned and in the form of several clusters. The strike of these clusters is oriented in various directions, indicating that the fault zone forms a complex fault geometry. We also found that the distribution of earthquakes was continuous from the upper crust to the lower crust after the M6.2 earthquake that occurred during the observation period. This seismic activity in the lower crust may be related to the presence of fluid supplied by the uppermost mantle.

• 海底地震磁力計の実用化　-海底ハイブリッド観測に向けて-

  Project Period (FY)： 2014/04  -  2016/03 

  Grant-in-Aid for Young Scientists(B)  Principal Investigator  26800234 

Lesson Subject 【 display / non-display 】

Lesson Subject 【 display / non-display 】