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Study on subsurface structure by using geoidal height from GPS/leveling and gravity in the southern part of central Japan

Research Project

Project/Area Number 06640543
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionShizuoka University

Principal Investigator

SATOMURA Mikio  Shizuoka University, Faculty of Science, Professor, 理学部, 教授 (50126778)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsGeoid / Gravity / GPS / Southern Parts of Central Japan / Subsurface Structure / Mt.Fuji / Isostasy / Akaishi Mountains / 岩石密度
Research Abstract

Determination of the geoid is one of the fundamental subjects of geodesy. Its study is necessary to combine traditional geodetic survey data and new geodetic data by applying space technique. Development of GPS technique makes precise determination of geoidal height possible by comparison between ellipsoidal height and orthometric height.
It is thought that the collision of the Pilippine Sea plate to the Eurasia plate produced volcanoes such as Mt.Fuji and tectonic mountains such as Akaishi mountains in the southern part of central Japan. The subsurface structures of this region have been investigated through gravity surveys and seismic explorations. In this study they are investigated by adding geoid data to gravity and seismic exploration data.
We performed precise determination of geoidal heights by GPS measurements near benchmarks, and the geoidal heights obtained at some stations in Akaishi mountains area have more than 1 m differences from those obtained from gravity data.
We analyzed gravity data in the area concerned, and made clear that there is no subducting slab with high density to the northwest direction from Izu Peninsula. We also pointed out that the Moho discontinuity is deeper than that estimated from seismic explorations under Akaishi mountains.
It was thought that Mt.Fuji has no isostatic root because the contour of Bouguer anomalies has no disturbances there. The gravity effects of the root, however, are so small that the root, if it exists, seldom affects to Bouguer anomalies. We made isostatic anomaly map and showed that gravity anomalies near Mt.Fuji can be explained in both cases that Mt.Fuji has an isostatic root and not.

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 鈴木洋・里村幹夫・益永雅博: "GPS/Leveling法による赤石山脈周辺のジオイド高の決定" 静岡大学地球科学研究報告. No.21. 29-36 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 里村幹夫: "東海地方の重力異常" 月刊地球. 号外No.11. 62-68 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tanaka,T and Satomura,M.: "Reconsideration on the isostasy of Mt,Fuji" Journal of the Geodetic Society of Japan. 41. 251-262 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Suzuki, M.Satomura and M.Masunaga: "Determination of geoidal heights by comparing orthometric heights with ellipsoidal heights obtained by GPS in the Akaishi mountains area, central Japan" Geoscience Reports, Shizuoka University. N0.21. 29-36 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Satomura: "Gravity anomalies in the Tokai District" The Earth Monthly, Special Issue. No.11. 62-68 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Tanaka and M.Satomura: "Reconsideration on the isostasy of Mt.Fuji" Journal of the Geodetic Society of Japan. Vol.41, No.3. 251-262 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 里村幹夫: "東海地方の重力異常" 月刊地球. 号外No11. 62-68 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Tanaka,T.and Satomura,M.: "Reconsideration on the isostasy of Mt.Fuji" Journal of the Geodetic Society of Japan. 41. 251-262 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 鈴木洋,里村幹夫,益永雅博: "GPS/Leveling法による赤石山脈周辺のジオイド高の決定" 静岡大学地球科学研究報告. 21. 29-36 (1994)

    • Related Report
      1994 Annual Research Report

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

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