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Tectonics of the southeastern Philippine Sea using GPS

Research Project

Project/Area Number 09041096
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

KATO Teruyuki  University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (80134633)

Co-Investigator(Kenkyū-buntansha) MATSUSHIMA Takeshi  Kyushu University, Faculty of Science, Research Associate, 理学部, 助手 (40222301)
KOTAKE Yoshihiko  University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (60012944)
NAKAO Shigeru  University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (90237214)
VAMACHO Juan T.  Emergency Management Office, Commonwealth of the Northern Mariana Islands, Researcher, 研究員
CAMACHO Juan  サイパン緊急管理局, 研究員
KOSHIBA Frit  パラオ測地局, 主任研究員
BEAVAN John  ニュージーランド地質学原子核研究所, 上級研究員
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1997: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsGPS / Northern Mariana / Philippine Sea / plate / back-arc spreading / マリアナトラフ / テクトニクス / 宇宙技術 / 西太平洋 / フィルピン海プレート
Research Abstract

In order to investigate the instantaneous motion of the Mariana arc, we have conducted twice of the GPS obserbation in the Northern Mariana Islands in 1998 and 1999 following the first occupation in 1992 and 1994. We have conducted four day sessions in January-February of 1998 and February of 1999 using seven Trimble 4000SSE GPS receivers. The results were analyzed using the Bernese Ver. 0.0 baseline analysis software togeher with 1994 data. Results suggests that the islands are moving toward east relative to the main Philippine Aes plate. Estimated velocities at each islands are ; 10.4mm/yr with N113E for Agrihan, 20.0mm/yr with N70E for Pagan1 20.9mm/yr with N73E for Guguan, 40.0mm/yr with N75E for Anatahan, 40.3mm/yr with N83E for Saipan, and 50.8mm/yr with N93E for Guam, respectivery. Thus estimated velocities may represent the velocity of back-arc spreading at the Mariana trough. It would be worthy to note that the velocity is larger and move eastward when we go to southern islands. This may suggest how is the back-arc spreading at present time.
Although our research was successfully conducted, we may have to consider the followings. 1) we should conduct GPS surveys for the islands further north because these islands are not yet re-occupied, which is important to clarify how far the back-arc is reaching to north. 2) we should repeat surveys for all of these islands considering that many of islands are volcanic so that the monitoring of local deformation of these islands are important in terms of volcanic hazard reduction.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Kato, T., et al.: "Initial Results from WING, the continuous GPS network in the western Pacificarea"Geophysical Researh Letters. 25・3. 369-372 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 小竹美子,他: "西太平洋GPS連続観測網データの解析について(その1)"測地学会誌. 44. 1-19 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 小竹美子,他: "GPS観測に基づくフィリピン海プレートの相対運動と西南日本のテクトニクス"地震II. 51. 171-180 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 松島健・加藤照之: "北マリアナ諸島の火山について"火山. 44・3. 179-182 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, T. et al.: "Initial results from WING, the continuous GPS network in The western Pacific area"Geophys. Res. Lett.. 25-3. 369-372 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kotake, Y., T. Kato et al.: "On the data analysis of the Western Pacific Integrate Network of GPS (part 1)"J. Geod. Soc. Japan. 44-1. 1-19 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, T. et al.: "Crustal strains in the Japanese islands as deduced from dense GPS array"Geophys. Res., Lett.. 25-18. 3445-3448 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kotake, Y., T. Kato et al.: "Relative motion of the Philippine Sea plate derived From GPS observations and ttectonics of the south-western Japan"Zishin ii. 51-2. 171-180 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato,T.,et al.: "Initial results from WING,the continuous GPS network in the western Pacific area" Geophysical Research Letters. 25. 369-372 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 小竹美子・加藤照之他: "西太平洋GPS連続観測網データの解析について(その1)" 測地学会誌. 44. 1-19 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kato,T.et al.: "Crustal strains in the Japanese islands as deduced from dense GPS array" Geophysical Research Letters. 25. 3445-3448 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 小竹美子・加藤照之他: "GPS観測に基づくフィリピン海プレートの相対運動と西南日本のテクトニクス" 地震. 51. 171-180 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kato, T.他: "Initial vesults from WING,the continuous GPS network in the western Pacific aven" Geophys.Res.Lett.25. 369-372 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 加藤 照之・小竹 美子: "GPSから見たプレート運動のゆらぎ" 月刊「地球」. 223. 8-13 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 加藤 照之: "海半球GPSで見る地球" 月刊「地球」. 211. 29-33 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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