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Investigation of low-frequency earthquake/tremor in shallow portion of subduction zone: Marine earthquake observation in the Cascadia subuction zone

Research Project

Project/Area Number 23253005
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Solid earth and planetary physics
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

KODAIRA Shuichi  独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, 研究開発センター長 (80250421)

Co-Investigator(Renkei-kenkyūsha) OBANA Koichiro  独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, 主任研究員 (10359200)
TAKAHASHI Narumi  独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, 研究開発センター長代理 (70359131)
MIURA Seiichi  独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, グループリーダー (00371724)
TAKAHASHI Tsutomu  独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, 主任研究員 (90435842)
YAMAMOTO Yojiro  独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, 研究員 (10540859)
SUETSUGU Daisuke  独立行政法人海洋研究開発機構, 地球内部ダイナミクス研究分野, 分野長 (20359178)
Project Period (FY) 2011-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥50,700,000 (Direct Cost: ¥39,000,000、Indirect Cost: ¥11,700,000)
Fiscal Year 2014: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2013: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Fiscal Year 2012: ¥29,900,000 (Direct Cost: ¥23,000,000、Indirect Cost: ¥6,900,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords地震 / 津波 / カスカディア地震発生帯 / 低周波地震 / 沈み込み帯 / スローな地震 / 海洋地殻 / 地震観測
Outline of Final Research Achievements

Cascadia margin is a seismogenic subduction zone with a history of the repeated occurrence of megathrust earthquakes. The Cascadia subduction zone has many similarities with the Nankai subduction zone. We conducted earthquake observation using ocean bottom seismographs as a comparable study between Cascadia and Nankai subduction seismogenic zones. Our results show that during the observation period most of the offshore seismicity occurred in the subducting plate along the Nootka fault zone. Otherwise seismicity was extremely low, with no earthquakes located along the shallow, seismogenic part of the Cascadia megathrust. The lack of interplate seismicity may indicate complete healing and locking of the megathrust over three centuries after the great earthquake of 1700 and a somewhat lower degree of structure heterogeneity.

Report

(5 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (10 results)

All 2015 2014 2013 2011 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 1 results) Presentation (8 results)

  • [Journal Article] Earthquake Activity in Northern Cascadia Subduction Zone Off Vancouver Island Revealed by Ocean‐Bottom Seismograph Observations2015

    • Author(s)
      Obana, K., Scherwath, M., Yamamoto, Y., Kodaira, S., Wang, K., Spence, G., Riedel, M., and Kao, H.
    • Journal Title

      Bull. Seismol. Soc. Am

      Volume: 105 Issue: 1 Pages: 489-495

    • DOI

      10.1785/0120140095

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Seafloor seismometers monitor northern Cascadia earthquakes2011

    • Author(s)
      Scherwath
    • Journal Title

      EOS, Transactions American Geophysical Union

      Volume: 92 Issue: 47 Pages: 421-440

    • DOI

      10.1029/2011eo470001

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] SeaJade:カナダ・カスカディア地震発生帯における海底地震観測2015

    • Author(s)
      尾鼻浩一郎・小平秀一・山本揚二朗・高橋努・利根川貴志,Kelin Wang, Michael Riedel, Honn Kao, Martin Scherwath, George Spence, Jesse Hutchinson, Ayodeji Paul Kuponiyi, 寺田育正・西條暁里
    • Organizer
      Blue Earth’15
    • Place of Presentation
      東京海洋大学品川キャンパス、東京都港区
    • Year and Date
      2015-03-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] Ps変換波を用いたカスカディア沈み込み帯における海底堆積物の異方性構造の推定2014

    • Author(s)
      利根川 貴志, 尾鼻 浩一郎, 山本 揚二朗, 小 平 秀一
    • Organizer
      日本地震学会2014年秋季大会
    • Place of Presentation
      新潟市朱鷺メッセ, 新潟県新潟市
    • Year and Date
      2014-11-26
    • Related Report
      2014 Annual Research Report
  • [Presentation] SeaJade Earthquake Observations in Cascadia Subduction Zone off Vancouver Island2014

    • Author(s)
      Koichiro Obana, Shuichi Kodaira, Yojiro Yamamoto, Tsutomu Takahashi, Kelin Wang, Michael Riedel, Honn Kao, Martin Scherwath, George Spence, Jesse Hutchinson, Ayodeji Paul Kuponiyi, Michael Bostock
    • Organizer
      IRIS Amphibious Array Facility Workshop
    • Place of Presentation
      Snowbird, UT, United States
    • Year and Date
      2014-10-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] Shear wave anisotropy within marine sediments in the Cascadia subduction zone derived from Ps converted waves2014

    • Author(s)
      Takashi Tonegawa, Koichiro Obana, Yojiro Yamamoto, Shuichi Kodaira, Kelin Wang, Michael Riedel, Honn Kao, George Spence
    • Organizer
      IRIS Amphibious Array Facility Workshop
    • Place of Presentation
      Snowbird, UT, United States
    • Year and Date
      2014-10-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] Northern Cascadia Seismicity From Ocean Floor Observations - Campaign and Permanent Seismic Experiments2013

    • Author(s)
      Heesemann, M, Scherwath, M, Kodaira, S, Obana, K, Yamamoto, Y, Spence, G, Riedel, M, Rogers, G C,Wang, K, McGuire, J J
    • Organizer
      Fall Meeting, AGU
    • Place of Presentation
      San Francisco, CA, USA
    • Year and Date
      2013-12-10
    • Related Report
      2013 Annual Research Report
  • [Presentation] Seismic Structures Beneath the Deformation Front of the Northern Cascadia Subduction Zone: Preliminary Results from the SeaJade Project2013

    • Author(s)
      Hutchinson, J A, Kao, H, Obana, K, Spence, G
    • Organizer
      Fall Meeting, AGU
    • Place of Presentation
      San Francisco, CA, USA
    • Year and Date
      2013-12-10
    • Related Report
      2013 Annual Research Report
  • [Presentation] Northern Cascadia Seismicity From Ocean Floor Observations ― Campaign and Permanent Seismic Experiments

    • Author(s)
      Heesemann, M, Scherwath, M, Kodaira, S, Obana, K, Yamamoto, Y, Spence, G D, Riedel, M, Rogers, G C, Wang, K, McGuire, J J
    • Organizer
      2013 Fall Meeting, AGU
    • Place of Presentation
      Moscone Center,San Francisco,USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] Seismic Structures Beneath the Deformation Front of the Northern Cascadia Subduction Zone: Preliminary Results from the SeaJade Project

    • Author(s)
      Hutchinson, J A*, Kao, H, Obana, K, Spence, G D
    • Organizer
      2013 Fall Meeting, AGU
    • Place of Presentation
      Moscone Center,San Francisco,USA
    • Related Report
      2012 Annual Research Report

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Published: 2011-04-06   Modified: 2019-07-29  

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