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Study of mountain uplifting mechanism of Peruvian Andes

Research Project

Project/Area Number 09041097
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

FUKAO Yoshio  Earthquake Research Institute, University of Tokyo, Professor, 地震研究所, 教授 (10022708)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Akihiko  Faculty of Science, Hokkaido University, Research associate, 大学院・理学研究科, 助手 (80191386)
TAIRA Asahiko  Ocean Research Institute, University of Tokyo, Professor, 海洋研究所, 教授 (50112272)
KOHNO Masaru  Graduate Schlock of Science, University of Tokyo, Professor, 大学院・理学系研究科, 教授 (20011596)
ISHITUKA Mutsumi  Ancon Observatory, Instituto Geofisico del Peru, Observatory Director, アンコン観測所, 所長
WOODMAN Ronald  Instituto Geofisico del Peru, Director, 所長
ISHITUKA Mut  ペルー国立地球物理研究所, アンコン観測所, 所長
WOODMAN RONA  ペルー国立地球物理研究所, 所長
MONTES Herma  ペルー国立地球物理研究所, 副所長
WOODMAN Rona  ペルー国立地球物理研究所, 所長
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 1998: ¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1997: ¥5,900,000 (Direct Cost: ¥5,900,000)
KeywordsAndes / gravity / Peru / Bouguer correstion / gravimeter / 火山岩層 / 地質 / IGP / 枕状溶岩 / 堆積層 / 断層
Research Abstract

We collected all the data of gravity measurements carried out over the last 40 years by Instituto Geofisico del Peru (IGP). Because of long time since the data collection, some of the important information needed for data reduction were lost in the mean time. For instance, it is not quite certain which constant table among several were applied to a particular to a particular survey conducted with a certain gravimeter. There were also other difficulties caused by the nature of the IGP dataset which became apparent to us in the course of conversion of the original data to gravity values. An example of this kind is that the measurement usually started at some point on the survey route and ended at another, so that it is difficult to find gravity stations correlatable to known references. Because of these problems, it was impossible to determine the gravity values unambiguously from the IGP data alone. Accordingly, there was a need for independently determined gravity stations to which the measurements done by IGP may be compared. In order to provide reference gravity values, we recalibrated the Japanese survey data obtained in 1980 and 1984, and conducted more surveys in various parts of Peru during the period from 1995 to 1998. These gravity stations number more than 800, and provide three or more reference points for each of the IGP survey routes. Using these references, the gravity values were calculated for the IGP dataset and Bouguer corrections were applied. Finally we established more than 10,000 gravity values in all survey routes and a Bouguer anomaly map of whole Peru was successfully produced based on these data.

Report

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

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Yamamoto, A.: "Estimating the optimum reduction density forgravity anomaly : A theoretical overview"J. Fac. Sci., Hokkaido Univ.. 11. 577-599 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kono, M., Y. Fukao, A. Yamamoto, M. Saito, L. Ocola, R. Woodman et al.: "Gravity Measurements, Data Reduction, and Bouguer Anomaly Map of Peru"Bull. Earthq. Res. Inst.. (in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Nawa, K, Y. Fukao, R. Shichi and Y. Murata: "Inversion of gravity data for the terrain density distribution in southwest Japan"J. Geophys. Res.. 102. 27703-27719 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Suda, N., N. Nawa and Y. Fukao: "Earth's background free oscillations"Science. 279. 2089-2091 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Fukao, Y., E. Fujita, S. Hori and K. Kanjo: "Response of volcanic conduit to step-like change in magma pressure"Geophys. Res. Lett.. 25. 105-108 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tajima, F., F. Fukao, M. Obayashi and T. Sakurai: "Evaluation of slab images in the northeastern Pacific, Earth Planets Space"OHP special issue. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamamoto, A.: "Estimation the optimum reduction density forgravity anomaly: A theoretical overview"Ja. Fac. Sci., HokkaidoUniv.. 11. 577-599 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kono, M. Y. Fukao, A. Yamamoti, M. Saito, L.Ocola, R. Woodman et al.: "Gravity Meauremements, Data Reduction, and Bouguer Anomaly Map of Peru"Bull. Earthq. Res. Inst.. (submitted). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Nawa, K., Y. Fukao, R. Shichi and Y. Murata: "Inversion of gravity data for the terrain density distribution in southwest Japan"J. Geophys. Res.. 102. 27703-27719 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Suda, N., N. Nawa and Y. Fukao: "Earth' background free oscilations"Sciene. 279. 2089-2091 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Fukao Y., E. Fujita, S. Hori and K. Kanjo: "Response of volcanic conduit to step-like change in magma pressure"Geophys. Res. Lett.. 25. 105-108 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamamoto.A.: "Estimating the optimum reduction density forgravity anomaly:A theoretical overview" J.Fac.Sci.,Hokkaido Univ.11. 577-599 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kono.M.,Y.Fukao.A.Yamamoto.M.Saito.L.Ocola,R.Woodman et a;.: "Gravity Measurements,Data Reduction,and Bouguer Anomaly Map of Peru(in press)" Bull.Earthq.Res.Inst.(1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Nawa,K,Y.Fukao,R.Shichi and Y.Murata: "Inversion of gravity data for the terrain density distribution in southwest Japan" J.Geophys.Res.102. 27703-27719 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Suda,N.,N.Nawa and Y.Fukao: "Earth's background free oscillations" Science. 279. 2089-2091 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Fukao,Y.,E.Fujita,S.Hori and K.Kanjo: "Response of volcanic conduit to step-like change in magma pressure" Geophys.Res.Lett.25. 105-108 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Tajima,F.,F.Fukao,M.Obayashi and T.Sakurai: "Evaluation of slab images in the northeastern Pacific,Earth Planets Space(in press)" OHP special issue. (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Suda, N., Nawa and Y.Fukao: "Incessant excitation of the Earath's free oscillations" Earth Planet and Space. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nawa, K., Suda, Y.Fukao, T.Sato, Y.Aoyama and K.shibuya: "Earth's background free oscillations" Science. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kono, M.: "Paleosecular variation in field directions dur to randomly varying Gauss coefficients" J.Geomag.Geoelectr.49. 615-631 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kono.M.: "Distribution of paleomagnetic directions and poles" Phys.Earth Planet.Inter.103. 313-327 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yamamoto, A., Saito, Y.Fukao et al.: "Construction of Gravity Anomaly Map of Whole Peru" Bull.Earthq.Res.Inst.(in press). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2021-08-25  

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