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Research on the tectonics of the southeastern Philippine Sea based on GPS observations

Research Project

Project/Area Number 14403003
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) MATSUSHIMA Takeshi  Kyushu University, Graduate School of Science, Associate Professor, 大学院・理学研究院, 助教授 (40222301)
TABEI Takao  Kochi University, Faculty of Science, Professor, 理学部, 教授 (40207220)
NAKADA Setsuya  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (60128056)
小竹 美子  東京大学, 地震研究所, 助手 (60012944)
宮崎 真一  東京大学, 地震研究所, 助手 (00334285)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2003: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2002: ¥7,000,000 (Direct Cost: ¥7,000,000)
KeywordsGPS / The Northern Marian Islands / back-arc / back-arc spreading / plate motion / Philippine Sea / Anatahan Island / eruption / フィリピン海プレート
Research Abstract

We have repeated GPS observations for darifying tectonic motion in the Northern Mariana Islands, Commonwealth of the Northern Mariana Islands. Moreover, we investigated the volcanic activity of Anatahan Island that began eruption in May 2003 for the first time in the human history. GPS observations were conducted in January 2003, July 2003 and May-Jun 2004. The obtained data were analyzed taking earlier data into consideration. Considering that the northernmost three islands were not been observed more than once, we extensively made observations in those three islands, namely, Asencion, Maug and Uracus. Results show that the effect of back-arc spreading in the Mariana Trough is eminent in the region. However, at the northern three islands, residual vectors that indicate effects of back-arc spreading show somewhat diverging vectors. The effect of back-arc spreading is not very eminent. This is probably due to short observation time of only one year. We should make more detailed analysis … More of the data. In addition, we may have to repeat GPS observations in the future to obtain more reliable results.
Anatahan volcano began erupting in May-Jun 2003. A series of subplinian explosive eruptions of andesite magma began at the Eastern Crater in the eastern part of the summit caldera on the evening of 10 May. Brown tephra was sent mainly westward by strong winds. Small-scale pyroclastic surges were discharged eastward outside the caldera in late May. An andesite lava dome that had once filled the inner crater was fragmented by phreatomagmatic explosions in the middle of June. The phreatomagmatic explosions probably occurred due to interaction of the magma lead with ground water around the crater, and abundant very fine ash ("gray tephra") was discharged within the caldera and over most of the island. The volume of eruption products of the May-June eruption was estimated to be 1.4x10^7 m^3 dense-rock-equivalent. Erupted pumices and lava are aphyric andesite and are variously colored depending on their vesicularity. The SiO2 contents of erupted materials decreased slightly with time. The fine gray ash is depleted in alkalies, probably due to leaching by acid hydrothermal fluids during explosions. Seismic activity resumed in late March 2004, and small strombolian-like explosions were repeated in May and June 2004. About hard of the inner crater was filled with new scoria and lava. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (17 results)

All 2005 2003 Other

All Journal Article (11 results) Publications (6 results)

  • [Journal Article] Geologic aspects of the 2003-2004 eruption of Anatahan Volcano, Northern Mariana Islands2005

    • Author(s)
      Nakada, S., M.Matsushima, M.Yoshimoto, 5 other authors
    • Journal Title

      J.Volcanol.Geotherm.Res. (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geodetic constraints for the mechanism of Anatahan eruption of May 20032005

    • Author(s)
      Watanabe, T., T.Tabei, T.Matsushima, 5 other authors
    • Journal Title

      J.Volcanol.Geotherm.Res. (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geologic aspects of the 2003-2004 eruption of Anatahan Volcano, Northern Mariana Islands2005

    • Author(s)
      Nakada, S., M.Matsushima, M.Yoshimoto, five other authors
    • Journal Title

      J.Volcanol.Geotherm.Res. (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geodetic constraints for the mechanism of Anatahan eruption of May 20032005

    • Author(s)
      Watanabe, T., T.Tabei, T.Matsushima, five other authors
    • Journal Title

      J.Volcanol.Geotherm.Res. (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geodetic constrains for the mechanism of Anatahan eruption of May 20032005

    • Author(s)
      Watanabe, T., T.Tabai, T.Kato他5名
    • Journal Title

      Journal of Volcanology and Geothermal Research

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Geological aspects of the 2003-04 eruption of Anatahan Volcano, Northern Mariana Islands2005

    • Author(s)
      Nakada, S., T.Matsushima他6名
    • Journal Title

      Journal of Volcanology and Geothermal Research

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Geodetic evidence of back-arc spreading in the Mariana Trough2003

    • Author(s)
      Kato, T., J.Beavan, T.Matsushima, Y.Kotake, 2 other authors
    • Journal Title

      Geophys.Res.Lett. 30

      Pages: 1625-1625

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Tectonics of the eastern Asia and the western Pacific as seen by GPS observations2003

    • Author(s)
      Kato, T.
    • Journal Title

      Geosci.J. 7

      Pages: 1-7

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 西太平洋地域の地殻変動-プレート運動と背弧拡大-2003

    • Author(s)
      加藤照之, 小竹美子
    • Journal Title

      月刊「地球」 25

      Pages: 31-35

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Geodetic evidence of back-arc spreading in the Mariana Trough2003

    • Author(s)
      Kato, T., J.Beavan, T.Matsushima, Y.Kotake, two other authors
    • Journal Title

      Geophys.Res.Lett. 30(7)

      Pages: 1625-1625

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Crustal motion in the western Pacific-Plate motion and hack-arc spreading2003

    • Author(s)
      Kato T, Y.Kotake
    • Journal Title

      Gekkan "Chikyu" 25

      Pages: 31-35

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Kato, T., other 5 authors: "Geodetic evidence of back-arc spreading in the Mariana Trough"Geophysical Research Letters. 30. 27-1-27-4 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kato, T.: "Tectonics of the eastern Asia and the western Pacific as seen by GPS observations"Geosciences Journal. 7. 1-8 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 高橋浩晃, 加藤照之, 他9名: "2周波GPS受信機による2000年有珠山噴火前後の地殻変動観測"火山. 47・3. 161-166 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 加藤照之: "GPS津波計-宇宙技術を用いた津波防災システム-"検査技術. 7・7. 52-57 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 加藤照之: "地震予知"非破壊検査. 51・10. 678-679 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 菊地正幸編(加藤照之他11名): "地球科学の新展開(7)「地殻ダイナミクスと地震発生」第三章地殻は変動する"朝倉書店. 222 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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