Multi-scale types of slow earthquakes based on ocean-bottom geodetic and seismological observations

2012 Fiscal Year Final Research Report

• Project/Area Number: 20244070
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Tohoku University
• Principal Investigator: FUJIMOTO Hiromi 東北大学, 災害科学国際研究所, 教授 (50107455)
• Co-Investigator(Kenkyū-buntansha): ITO Yoshihiro 東北大学, 大学院・理学研究科, 助教 (30435581) ; ITO Yoshihiro 東北大学, 災害科学国際研究所, 准教授 (10400235) ; HINO Ryota 東北大学, 大学院・理学研究科, 准教授 (00241521)
• Project Period (FY): 2008 – 2012
• Keywords: 地殻変動 / 海底変動

Research Abstract

We have observed two slow slip events in the Japan subduction zone. The slow slip events was observed in 2008 and 2011 by ocean-bottom geodetic network that had been newly established on the present work. Moderate and large Interpate earthquakes in 2008 and 2011 were preceded by the slow slip events respectively. The slow slip event in 2011 preceded the largest foreshock of the 2011 Tohoku-Oki earthquake. These suggest that slow slip plays an leading role in stress buildup to earthquake generation.

Research Products

• [Journal Article] Geodetic constraints on afterslip characteristics following the March 9, 2011, Sanriku-oki earthquake (2012)
  • Author(s): Ohta, Y., R. Hino, D. Inazu, M. Ohzono, Y.Ito, M. Mishina, T. Iinuma, J. Nakajima, Y. Osada, K. Suzuki, H. Fujimoto, K. Tachibana, T. Demachi, and S. Miura
  • Journal Title: Japan, Geophys. Res. Lett Volume: 39
  • DOI: doi:10.1029/2012GL052430.
  • Peer Reviewed
• [Journal Article] Coseismic slip distribution of the 2011 off the Pacific Coast of Tohoku Earthquake (M9.0) refined by means of seafloor geodetic data (2012)
  • Author(s): Iinuma, T., R. Hino, M. Kido, D. Inazu , Y.Osada , Y. Ito, M. Ohzono, H. Tsushima, S. Suzuki, H. Fujimoto, and S. Miura
  • Journal Title: J. Geophys. Res Volume: 117
  • DOI: doi:10.1029/2012JB009186.
  • Peer Reviewed
• [Journal Article] Trench-normal variation in observed seafloor displacements associatedwith the 2011 Tohoku-Oki earthquake (2011)
  • Author(s): Kido,M., Y. Osada, H. Fujimoto, R. Hino and Y. Ito
  • Journal Title: Geophys. Res. Lett Volume: 38
  • DOI: doi:10.1029/2011GL050057.
  • Peer Reviewed
• [Journal Article] 海底地殻変動 (2009)
  • Author(s): 藤本博己
  • Journal Title: 地震2 Volume: 61S Pages: S69-S74
  • Peer Reviewed
• [Journal Article] GPS音響技術を用いた測地観測手法の開発 (2008)
  • Author(s): 藤本博己
  • Volume: 20
  • Pages: 17-21
• [Journal Article] Development of a seafloor acoustic ranging system toward the seafloor cable network system (2008)
  • Author(s): Osada, Y., M. Kido, H. Fujimoto and Y.Kaneda
  • Journal Title: Ocean Engineering Volume: 35
  • DOI: doi:10.1016/j.oceaneng.208.07.007.
  • Peer Reviewed
• [Journal Article] Temporal variation of sound speed in ocean: a comparison between GPS/acoustic and in situ measurements (2008)
  • Author(s): Kido, M., Y. Osada and H. Fujimoto
  • Journal Title: Earth Planets Space Volume: 60 Pages: 229-234
  • Peer Reviewed
• [Journal Article] 10HzGPS受信機導入による海底地殻変動観測高度化の試み (2008)
  • Author(s): 長田幸仁・水上知子・木戸元之・太田雄策・対馬弘晃・三浦哲・藤本博己
  • Journal Title: 測地学会誌 Volume: 54 Pages: 141-151
  • Peer Reviewed
• [Journal Article] 過去の海底地殻変動観測における動揺センサーデータの有効利用について (2008)
  • Author(s): 木戸元之・藤本博己・長田幸仁
  • Journal Title: 測地学会誌 Volume: 54 Pages: 163-179
  • Peer Reviewed
• [Journal Article] GPS/A方式地殻変動観測に向けた観測システムの開発 (2008)
  • Author(s): 藤本博己・木戸元之・長田幸仁・金田義行
  • Journal Title: 測地学会誌 Volume: 54 Pages: 181-187
  • Peer Reviewed
• [Journal Article] Ashi, Episodic slow slip eventsin the Japan subduction zone before the 2011 Tohoku-Oki earthquake
  • Author(s): Y. Ito, R. Hino, M. Kido, H. Fujimoto, Y.Osada, D. Inazu, Y. Ohta, T. Iinuma, M. Ohzono, S. Miura, M. Mishina, K. Suzuki, T. Tsuji, J
  • Journal Title: Tectonophysics Volume: (in press)
  • DOI: doi:10.1016/j.tecto.2012.08.022
  • Peer Reviewed
• [Journal Article] 東北地方太平洋沖地震の前震・本震・余 震の分布ー海底地震観測による
  • Author(s): 日野亮太 、鈴木健介、 伊藤喜宏 、金田義行
  • Journal Title: 科学 Volume: 81, 2011 Pages: 1036-1043
• [Journal Article] Frontal wedge deformation near the source region of the2011 Tohoku-Oki earthquake
  • Author(s): Ito, Y., T. Tsuji, Y. Osada, M. Kido, D.Inazu, Y. Hayashi, H. Tsushima, R. Hino, and H. Fujimoto
  • Journal Title: Geophys. Res. Lett Volume: 3 8
  • DOI: doi:10.1029/2011GL048355.
  • Peer Reviewed
• [Presentation] Extended GPS/Acoustic geodetic observation near the Japan Trench axis for the study of the giant 2011 Tohoku-oki earthquake (2013)
  • Author(s): Fujimoto, H., M. Kido, T. Iinuma, Y. Osada, J. Yamamoto, K. Tadokoro, and M. Sato
  • Organizer: Underwater of Technology2013
  • Place of Presentation: Tokyo
  • Year and Date: 2013-03-05
• [Presentation] Development of GPS/A seafloor geodetic network along Japan Trench and Onset of its operation (2012)
  • Author(s): Kido, M., H. Fujimoto, Y. Osada, Y. Ohta, J.Yamamoto, K. Tadokoro, T. Okuda, T. Watanabe, S. Nagai, and K. Yasuda
  • Organizer: AGU 2012 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2012-12-03
• [Presentation] Development of precision acoustic transonders for GPS/Acoustic observation on the deep seafloor near the Japan Trench axis (2012)
  • Author(s): Fujimoto, H., and M. Kido
  • Organizer: AGU2012 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2012-12-03
• [Presentation] Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake (2012)
  • Author(s): Ito, Y., R. Hino, M. Kido, H. Fujimoto, Y.Osada, D. Inazu, Y. Ohta, T. Iinuma, M. Ohzono, M. Mishina, S. Miura, K. Suzuki, T. Tuji, and J. Ashi
  • Organizer: AGU2012 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2012-12-03
• [Presentation] Continuous offshore seismological and geodetic monitoring in a rupture zone of the M9 off Tohoku Earthquake (2012)
  • Author(s): Hino R., Y. Ito, K. Suzuki, S. Suzuki, D.Inazu, T. Iinuma, S. Ii, H. Fujimoto, T. Yamada, M. Shinohara, T. Kanazawa, M. Abe, Y. Kawaharada, Y. Hasegawa, Y. Yamamoto, S. Kodaira, and Y. Kaneda
  • Organizer: AOGS-AGU(WPGM) Joint Assembly
  • Place of Presentation: Singapore, Singapore
  • Year and Date: 2012-08-13
• [Presentation] Trench-normal variation in coseismic displacement of the 2011Tohoku-oki earthquake detected trough GPS/acoustic surveys (2011)
  • Author(s): Kido, M., Y. Osada, H. Fujimoto, R. Hino, and Y. Ito
  • Organizer: AGU 2011 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] Improvement of the GPS/A system for extensive observation along subduction zones around Japan (2011)
  • Author(s): Fujimoto, H., M. Kido, K. Tadokoro, M.Sato, T. Ishikawa, A. Asada, M. Mochizuki
  • Organizer: AGU 2011 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] Frontal wedge deformation near the source region of the2011 Tohoku-Oki earthquake (2011)
  • Author(s): Ito. Y., T. Tsuji, Y. Osada, M. Kido, D.Inazu, Y. Hayashi, H. Tsushima, R. Hino, and H. Fujimoto
  • Organizer: AGU 2011Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] Ocean-bottom seismic and geodetic observations of transient slow slip events in the Japan Trench (2011)
  • Author(s): Ito, Y., Y. Osaa, M. Kido, D. Inazu, N.Uchida, R. Hino, H. Fujimoto, S. Suzuki, H. Tsushima, R. Azuma, K. Suzuki, S. Koga, S. Ii, T. Tsuji, N. Nakayama, and J. Ashi
  • Organizer: WPGM2010
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 2011-06-22
• [Presentation] Ocean-bottom seismic and geodetic observations of transient slow slip events in the Japan Trench (2010)
  • Author(s): Ito, Y., Y. Osada, M. Kido, D. Inazu, N.Uchida, R. Hino, H. Fujimoto, S. Suzuki, T. Tsushima, R. Azuma, K. Suzuki, S. Koga, S. Ii., T. Tsuji, N. Nakayama, J. Ashi
  • Organizer: WPGM2010
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 2010-06-22
• [Presentation] Seafloor geodesy using the GPS/acoustic technique: towards next generation approach (2009)
  • Author(s): Kido, M., Y. Osada, H. Fujimoto, and Y.Kaneda
  • Organizer: 第21回海洋工学シ ンポジウム
  • Place of Presentation: 東京
  • Year and Date: 2009-08-06
• [Presentation] Shallow very-low-frequency earthquakes around Japan; Recent studies and observation (2008)
  • Author(s): Ito, Y., K. Obara, Y. Asano, H. Fujimoto, R.Hino, J. Ashi, T. Tsuji
  • Organizer: AGU 2008 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2008-12-16
• [Presentation] Development of new tubular buoy for seafloor geodetic observation with cabled system (2008)
  • Author(s): Kido, M., Y. Osada, H. Fujimoto, Y. Kaneda
  • Organizer: AGU 2008 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2008-12-16
• [Presentation] Tracking buoy motion/attitude using incomplete rate-gyro data in the GPS/acoustic measurement (2008)
  • Author(s): Kido, M., H. Fujimoto, Y. Osada
  • Organizer: The 7^<th> General Assembly of Asian Seismological Commission
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-11-25
• [Presentation] geodetical and cold-seepage observations for detection of slow earthquakes along Japan Trench (2008)
  • Author(s): Ito, Y., H. Fujimoto, R. Hino, M. Kido, Y.Osada, Y. Yamamoto, S. Suzuki, R. Azuma, H. Tsushima, K. Suzuki, T. Tsuji, N. Nakayama, J. Ashi and T. Gamo, Seismological
  • Organizer: The 7^<th> General Assembly of Asian Seismological Commission
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-11-25
• [Presentation] Development of GPS/A seafloor positioning system for future application to continuous observation with a moored buoy (2008)
  • Author(s): Fujimoto, H., M. Kido, Y. Osada, Y. Kaneda
  • Organizer: The 7^<th> General Assembly of Asian Seismological Commission
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-11-25
• [Book] 現代地球科学入門シリーズ第8巻測地・津波 (2013)
  • Author(s): 藤本博己・三浦哲・今村文彦
  • Total Pages: 228
  • Publisher: 共立出版
• [Book] 東日本大震災を解き明かす (2011)
  • Author(s): NHK「サイエンスZERO」取材班・古村孝志・伊藤喜宏・辻健
  • Total Pages: 126
  • Publisher: NHK出版