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Ocean Bottom Seismographic Survey of the Earthquake Swarm which occur beneath Mid Atlantic Ridge.

Research Project

Project/Area Number 06044005
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionHokkaido University

Principal Investigator

SHIMAMURA Hideki  Laboratory for Ocean Bottom Seismology, Faculty of Science, Hokkaido University, Professor, 理学部, 教授 (10011636)

Co-Investigator(Kenkyū-buntansha) レピン ジャンクロード  パリ第6大学, 地球物理学部, 助教授
アベディック フェリック  フランス海洋庁, 海洋研究所, 主任研究員
ヒルン アルフレッド  パリ第6大学, 地球物理学部, 教授
ミエルデ ロルフ  ベルゲン大学固体地球物理学研究所, 助教授
ホワイト ロバート  英国ケンブリッジ大学, 海洋研究所, 教授
ディグラネス パー  ベルゲン大学固体地球物理学研究所, 助教授
セレボール アークバード  ベルゲン大学固体地球物理学研究所, 教授
グンナールソン カール  アイスランド資源庁, 資源研究所, 主任研究員
アイナルソン ポール  アイスランド大学, 理学部, 教授
ブランズドッティル ブリ  アイスランド大学, 理学部, 助教授
ベルグソン ベルグール  アイスランド気象庁, 地震火山研究部, 主任研究員
グドムソン グンナール  アイスランド気象庁, 地震研究部, 主任
ステファンソン ラグナー  アイスランド気象庁, 地震火山部, 部長
金沢 敏彦  東京大学, 地震研究所, 教授 (30114698)
IWASAKI Takaya  Earthquake Research Institute, Tokyo University, Assistant Professor, 地震研究所, 助教授 (70151719)
KODAIRA Shuuichi  Faculty of Science, Hokkaido University, Research Associate, 主任研究員 (80250421)
SHIOBARA Hajime  Laboratory for Ocean Bottom Seismology, Faculty of Science, Hokkaido University, 理学部, 助手 (60211950)
DIGRANESS Per  Institute of Solid Earth Geophysics, University of Bergen, Norway, Research Asso
GUNNARSSON Karl  Icelandic Energy Authority, Iceland, Chief Geophysical Investigator
EINARSSON Pall  Science Institute, University of Iceland, Iceland, Professor
BRANDSDOTTIR Bryndis  Science Institute, University of Iceland, Iceland, Associate Professor
BERGSSON Bergur  Icelandic Meteorological Office, Iceland, Geophysical Investigator
GUDMUNDSSON Gunnar  Icelandic Meteorological Office, Iceland, Chief Geophysical Investigator
STEFANSSON Ragnar  Icelandic Meteorological office, Iceland, Director Geophysical Department
MJELDE Rolf  Institute of Solid Earth Geophysics, University of Bergen, Norway, Associate Pro
WHITE Robert  Bullard Laboratory, University of Cambridge, UK,Professor
AVEDIK Felix  IFREMER,France, Chief Investigator
HIRN Alfred  Institute of Physics of the Earth, University of Paris, France, Professor
SELLEVOLL Markvard  Institute of Solid Earth Geophysics, University of Bergen, Norway, Professor
セレボール マークハード  ベルゲン大学, 固体地球物理学研究所, 教授
ドッティル ブリンディス  アイスランド大学, 理学部, 助教授
グドムソン グシナール  アイスランド気象庁, 地震研究部, 主任
セレボール マークバード  ベルゲン大学, 固体地球物理学研究所, 教授
アバディック フェリック  フランス海洋庁, 海洋研究所, 主任研究員
ブランズトッティル ブリ  アイスランド大学, 理学部, 助教授
セレポール マークバード  ベルゲン大学, 固体地球物理学研究所, 教授
アィナルソン ポール  アイスランド大学, 理学部, 教授
トッティル ブリンディス  アイスランド大学, 理学部, 助教授
ベルグソン ベルグナール  アイスランド気象庁, 地震火山部, 主任研究員
クドムソン グンナール  アイスランド気象庁, 地震火山部, 主任
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥18,200,000)
Fiscal Year 1996: ¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1995: ¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1994: ¥5,900,000 (Direct Cost: ¥5,900,000)
KeywordsOcean Bottom Seismographic Observations / Earthquakes of Mid-Ocean Ridges / Ocean Bottom Seismograph / Reykjanes Ridge / Birth of a (lithospheric) plate / Mid-Atlantic Ridge / Plate tectonics / Passive plate margin / 単一パルスエアガン / 海底微小地震観測
Research Abstract

Mid-Atlantic Ridge is the place where plate (lithosphere) is being born.. Because usual land-based seismographs are too far to study Ridges, we made use of 30-50 sensitive portable OBSs (Ocean Bottom Seismographs) to make detailed microearthquake observations and refraction studies to study detailed crustal/upper mantle structures. Also we studied Atlantic passive margins, which is a remnant of spreading of the Atlantic Ocean.
We brought about 30 OBSs to the Atlantic in 1994,1995 and 1996. In 1994 we made two experiments in the Atlantic : one on the Reykjanes Ridge and the other in the Bay of Biscay. In the former, we succeeded to obtain a detailed hypocentral distribution of microearthquakes, and the structure beneath the Ridge. In the latter, we succeeded to develop a powerful controlled source survey to study crustal/upper mantle structure, with a combination of the single-bubble pulse airgun and the sensitive OBS.
In 1995 we made an extensive OBS-airgun refraction survey in a region … More from Kolbeinsey Ridge, which is a part of Mid-Atlantic Ridge north of Iceland, to Jan Mayn Ridge, which is thought a remnant continent before the Atlantic was born. We have succeeded to obtain a continuous detailed structure for the whole transect from Kolbeinsey Ridge to Jan Mayn Ridge, which is quite important to study the history of opening of the Atlantic Ocean.
In 1996 we also made two experiments in the Atlantic : one on the Voring Basin off Norway and the other in the transition from Reykjanes Ridge to Iceland. The former was to illustrate a very detailed crustal structure off Norway, where a remnant initiation of the opening of the Atlantic is kept beneath the flow basalt. The flow basalt is very impenetrable rock for the usual seismic reflection method used in the sea, however our OBS refraction survey can penetrate beneath the layr. The latter was to study micro-earthquakes beneath the transition from Reykjanes Ridge to Iceland which is essential to study how Iceland and the Ridge was formed. We also made controlled source study in this area to elucidate detailed crustal structure of the transition. We used 30 OBS plus 47 temporary land seismographs for this study. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (53 results)

All Other

All Publications (53 results)

  • [Publications] 望月將志,小平秀一,塩原肇,島村秀紀,Bryndis Brandsdottir,Erik Sturkell,Ragnar Stefansson: "海底地震観測によるTjornes Fracture Zoneの地震活動" 『地震』,第2輯. 48. 257-270 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 島村英紀: "地震列島との共生" 岩波書店,科学ライブラリー, 128 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 島村英紀: "地球がわかる50話" 岩波書店,ジュニア新書, 224 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shimamura, H., Stefansson, R., Mochizuki, M., Watanabe, T., Shiobara, H., Gudmundsson, G., Einarsson, P.: "Northern Reykjanes Ridge microseismicity revealed by dense OBS arrays" in Seismology in Europe, edited and published by European Seismological Commission, 701pp.491-497 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kodaira, S,Mjelde, R., Gunnarson, K., Shiobara, H., and Shimamura, H.: "Crustal structure of the Kolbeinsey Ridge, N.Atlantic, obtained by use of Ocean-Bottom Seismographs" Journal of Geophysical Researches. 102 (B2). 3131-3151 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mjelde, R., Fjellanger, J.P., Digranes, P., Kodaira, S., Shimamura, H., and Shiobara, H.: "Application of the single bubble air-gun technique for OBS-data acquisition across the Jan Mayn Ridge, North Atlantic" Marine Geophysical Researches. 19. 81-96 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mjelde, R., Kodaira, S., Hassan, R.K., Goldschmidt-Rokita, Tomita, N., Sellevoll, M.A., Hirschleber, H.B., Shimamura, H., Iwasaki, T., and Kanazawa: "The continent/ocean transition of the Lofoten volcanic margin, N.Norway" Journal of Geodynamics. 22 (3/4). 189-206 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mjelde, R., Myhre, B., Sellevoll, M.A., Shimamura, H., Iwasaki, T., and Kanazawa, T.: "Modeling of S-waves from an area covered with flood-basalt offLofoten, N.Norway" Geophysical Transactions. 40 (1). 95-117 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kodaira, S., Iwasaki, T., Urabe, T., Kanazawa, T., Egloff, F., Makris, J.and Shimamura, H.: "Crustal structure across the middle Ryukyu trench obtained from ocean bottom seismographic data" Tectonophysic. 263. 39-60 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mjelde, R., Berg, E.W., Strom, A., Riise, O., Shimamura, H., Kanazawa, T., Shiobara, H., Kodaira, S., and Fjellanger, J.P.: "An extensive Ocean Bottom Seismograph survey in the Voring basin, N.Norway" First Break (EAGE). 14 (6). 247-256 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kodaira, S., Bellenberg, M., Iwasaki, T., Kanazawa, T., hirschleber, H.B., and Shimamura, H.: "Vp/Vs ratio structure of the Lofoten continental margin, N.Norway, and itsgeological implications" Geophysical Journal International. 124. 724-740 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kodaira, S., Mjelde, R., Sellevoll, M.A., Hirschleber, H.B., Iwasaki, T., Kanazawa, T., and Shimamura, H.: "Crustal transect across the Lofoten volcanic passive continental margin, N.Norway, obtained by use of ocean bottom seismographs, and implications for its evolution" Journal of Physics of the Earth. 43. 729-745 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kodaira, S., Goldschmidt-Rokita, A., Hartmann, J.M., Hirschleber, H.B., Iwasaki, T., Kanazawa, T., Krahn, H., Tomita, S., and Shimamura, H.: "Crustal Structure of the Lofoten continental margin, off northern Norway, from ocean-bottom seismographic studies" Geophysical Journal International. 121. 907-924 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Mjelde, R., Sellevoll, M.A., Shimamura, H., Iwasaki, T., and Kanazawa, T.: "S-wave anisotropy off Lofoten, Norway, indicative of fluids in the lower continental crust?" Geophysical Journal International. 120. 87-96 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Iwasaki, T., Sellevoll, M.A,Kanazawa, T., Veggeland, T.and Shimamura.H.: "Seismic refraction study along the Sogne-fjord, south-west Norway, employing ocean-bottom seismometers" Geophysical Journal International. 119. 791-808 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Goldschmidt-Rokita, A., Hansch, K.J.F., Hirschleber, Iwasaki, T., Kanazawa, T., Shimamura, H., and Sellevoll, M.A.: "The ocean/continent transition along a profile through the Lofoten Basin, Northern Norway" Marine Geophysical Researches. 16. 201-224 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Shimamura: Iwanami-shoten, Tokyo, Japan. The Earth・・・to help understanding the Earth's Interior, 220 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Shimamura: Iwanami-shoten, Tokyo, Japan. Japan-the Earthquake Country, 120 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shimamura,H.,Stefansson,R.,Mochizuki,M.,Watanabe,T.,Shiobara,H.,Gudmundsson,G.,and Einarsson,P: "Northern Reykjanes Ridge microseismicity revealed by dense OBS arrays" in Seismology in Europe,edited and published by European Seismological Commission,701pp.491-497 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S,Mjelde,R.,Gunnarson,K.,Shiobara,H.,and Shimamura,H.: "Crustal structure of the Kolbeinsey Ridge,N.Atlantic,obtained by use of Ocean-Bottom Seismorgraphs" Journal of Geophysical Researches. 102(B2). 3131-51 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Fjellanger,J.P.,Digranes,P.,Kodaira,S.,Shimamura,H.,and Shiobara,H.: "Application of the single bubble airgun technique for OBS-data acquisition across the Jan Mayen Ridge,N Atlantic" Marine Geophysical Researches. 19. 81-96 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Kodaira,S.,Shimamura,H.,et al.: "The continent/ocean transition of the Lofoten volcanic margin,Northern Norway" Journal of Geodynamics. 22(3/4). 189-206 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Myhre,B.,Sellevoll,M.A.,Shimamura,H.,Iwasaki,T.,and Kanazawa T.: "Modeling of S-waves from an area covered with flood-basalt off Lofoten,Northern Norway" Geophysical Transactions. 40(1). 95-117 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S.,Iwasaki,T.,Urabe,T.,Kanazawa,T.,Egloff,F.,Makris,J.and Shimamura,H.: "Crustal structure across the middle Ryukyu trench obtained from ocean bottom seismographic data" Tectonophysics. 263. 39-60 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Berg,E.W.,Shimamura,H.,et al.: "An extensive Ocean Bottom Seismograph survey in the Voring basin,N.Norway" First Break (EAGE). 14(6). 247-256 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S.,Bellenberg,M.,Iwasaki,T.,Kanazawa,T.,Hirschleber,H.B.,and Shimamura,H.: "Vp/Vs ratio structure of the Lofoten continental margin,N.Norway,and its geological implications" Geophysical Journal International. 124. 724-740 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S.,Mjelde,R.,Sellevoll,M.A.,Hirschleber,H.B.,Iwasaki,T.,Kanazawa,T.,and Shimamura,H.: "Crustal transect across the Lofoten volcanic passive continental margin,Northern Norway" Journal of Physics of the Earth. 43. 729-745 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S.,Shimamura,H.,etc.: "Crustal Structure of the Lofoten continental margin,off northern Norway,from ocean-bottom seismographic studies" Geophysical Journal International. 121. 907-924 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Shimamura,H.et al.: "S-wave anisotropy off Lofoten,Norway,indicative of fluids in the lower continental crust?" Geophysical Journal International. 120. 87-96 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Iwasaki,T.,Shimamura,H.et al.: "Seismic refraction study along the Sognefjord,south-west Norway,employing ocean-bottom seismometers" Geophysical Journal International. 119. 791-808 (1994)

    • Related Report
      1996 Annual Research Report
  • [Publications] Goldschmidt-Rokita,A.,Shimamura,H.et al.: "The ocean/continent transition along a profile through the Lofoten Basin,Northern Norway" Marine Geophysical Researches. 16. 201-224 (1994)

    • Related Report
      1996 Annual Research Report
  • [Publications] 望月將志,小平秀一,塩原肇,島村英紀,Bryndis Brandsdottir,Erik Sturkell,Ragnar Stefansson: "海底地震観測によるTjornes Fracture Zoneの地震活動" 『地震』,第2輯. 48. 257-270 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Digranes,P.,Mjelde,R.,Kodaira,S.,Shimamura,H.,Kanazawa,T.Shiobara,H.,and Berg,E.W.: "A regional shear-wave velocity model in the central Voring Basin,N.Norway,using three-component OBS" Marine Geophysical Researches. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S,Mjelde,R.,Sellevoll,M.A.,Hirschleber,H.B.,Iwasaki,T.,Kanazawa,T.,and Shimamura,H.: "Crustal transects across the Lofoten volcanic passive continental margin,N.Norway,obtained by use of OBS" Journal of Physics of the Earth. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Berg,E.W.,Strom,A.,Riise,O.,Shimamura,H.,Shiobara,H.,Kodaira,S.,and Fjellanger,J.P: "An extensive Ocean Bottom Seismorgraph survey in the Voring basin,N.Norway" Geophysical Journal International. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S,Mjelde,R.,Shiobara,H.,Kanazawa,T.,Shimamura,H.,and Berg,E.W.: "Crustal Structure along the northern Voring continental margin,off N.Norway,from OBS data" Tectonophysics. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Kodaira,S.,Digranes,P.,Shimamura,Kanazawa,T.,Shiobara,H.,and Berg,E.W.: "Semi-regional crustal structure from densely spaced OBSs in the Voring Basin,N.Norway" Geophysical Journal International. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Kodaira,S.,Shimamura,Kanazawa,T.,Shiobara,H.,Berg,E.W.,and Riise,O.: "Crustal structure of the central part of the Voring Basin,N.Norway,from three-component OBS" Geophysical Journal International. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Kodaira,S.,Hassan,R.K.,Goldschmidt-Rokita,Sellevoll,M.A.,Hirschleber,H.B.,Shimamura,H.: "The continent/ocean transition of the Lofoten volcanic margin,N.Norway" Journal of Geodynamics. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Mjelde,R.,Myhre,B.,Sellevoll,M.A.,Shimamura,H.,Iwasaki,T.,and Kanazawa,T.: "Modeling of S-waves from an area covered with flood-basalt off Lofoten,N.Norway" Biophysical Transactions. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Shiobara,H.,Nakanishi,A.,Mjelde,R.,Kanazawa,T.,Berg,E.W.,and Shimamura,H.: "Precise determination of OBS positions by using acoustic transponders and CTD" Marine Geophysical Researches. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Brandsdottir,B.,Shiobara,H.,White,R.,and Shimamura,H.: "RISE-96 OBS-land experiment to elucidate transitional structure from Reykjanse Ridge to Iceland" Geophysical Journal International. (投稿中).

    • Related Report
      1996 Annual Research Report
  • [Publications] Mochizuki,M.,Brandsdottir,B.,Shiobara,H.,White,R.,Einarsson,P.,and Shimamura,H.: "Microseismicity study on the Northern tip of Reykjanes Ridge to Iceland revealed by dense OBS array." Journal of Geodynamics. (準備中).

    • Related Report
      1996 Annual Research Report
  • [Publications] 島村英紀: "地震列島との共生" 岩波書店,科学ライブラリー, 128 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 島村英紀: "地球がわかる50話" 岩波書店,ジュニア新書, 224 (1994)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kodaira,S.,Bellenberg,M.,Iwasaki,T.,Kanazawa,T.,Hirschleber,H.B.,and Shimamura,H.: "Vp/Vs ratio structure of the Lofoten continental margin, N. Norway, and its geological implications" Geophysical Journal International. 124. 724-740 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kodaira,S.,Shimamura,H.et al.: "Crustal Structure of the Lofoten continental margin, off northern Norway, from ocean-bottom seismographic studies" Geophysical Journal International. 121. 907-924 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Mjelde,R.,Shimamura,H. et al.: "S-wave anisotropy off Lofoten, Norway, indicative of fluids in the lower continental crust?" Geophysical Journal International. 120. 87-96 (1955)

    • Related Report
      1995 Annual Research Report
  • [Publications] 望月將志,小平秀一,塩原肇,島村英紀,Bryndis Brandsdottir,Erik Sturkell,Ragnar Stefansson: "海底地震観測によるTjornes Francture Zoneの地震活動" 『地震』,第2輯. 48. 257-270 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shiobara, H., Avedik, F., and Shimamura, H.: "An OBS refraction survey by a combination with a single bubble pulse airgun system." Geophysical Journal International. (予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] Shimamura, H., Stefansson, R., Shiobara, H., Mochizuki, M.: "A detailed Ocean Bottom Seismographic survey on the Reykjanes Ridge" Geophysical Journal International. (予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] Avedik, F., Shimamura, H., Hirn, A., Shiobara, H., Kodaira, S., Lepine, J-C.: "The evolution of French Atlantic passive margin revealed by a detailed controlled source exp@eriment by OBSs." Geophysical Journal International. ((予定))

    • Related Report
      1994 Annual Research Report
  • [Publications] 島村 英紀: "地球がわかる50話" 岩波書店(岩波ジュニア新書), 219 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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