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Development of a seismic network in the Western Pacific

Research Project

Project/Area Number 07041092
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionUniversity of Tokyo

Principal Investigator

TAKEO Minoru  Earthquake Research Institute, University of Tokyo, 地震研究所, 助教授 (00197279)

Co-Investigator(Kenkyū-buntansha) TSUBOI Seiji  National Defense Academy, 地球科学科, 助教授 (90183871)
TAKANO Kiyoshi  Earthquake Research Institute, Univ.of Tokyo, 地震研究所, 助教授 (80134659)
YAMADA Isao  Faculty of Science, Nagoya Univ., 理学部, 助教授 (60022670)
MORITA Yuichi  Earthquake Research Institute, Univ.of Tokyo, 地震研究所, 助教授 (30220073)
FUKAO Yoshio  Earthquake Research Institute, Univ.of Tokyo, 地震研究所, 教授 (10022708)
笠原 順三  東京大学, 地震研究所, 教授 (70012953)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1996: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1995: ¥4,800,000 (Direct Cost: ¥4,800,000)
KeywordsBroad-band Seismic Network / Western Pacific
Research Abstract

The main purpose of this project is to install a broad-band seismic station in the Palau Islands and we have completed it successfully. The station lies at the middle part of Koror Island. We repaired an old air-raid shelter whose length is longer than 40 m, and made a seismometer table in a back room of the shelter. The seismometer room is divided from the other part of the shelter by three doors, and lies about 1 m deep from the land surface. Therefore, the temperature change is quite small in the seismometer room The recording system can be accessed using telephone line and has magnetic tape drives for data backup. We also setup a computer in PCC for retrieving the data by telephone line and storing on MO disk drive.
We analyzed source processes of large earthquakes occurred in the Western Pacific region. The details of rupture history of the 1994 Sanriku-Haruka-Oki earthquake and the 1995 Kobe earthquake are revealed by waveform inversion analyzes. The rupture process of the 1994 Sanriku-Haruka-Oki earthquake shows that the heterogeneity of the plate interface between the oceanic and the continental lithospheres affect rupture velocity, slip distribution, and the characteristics of earthquake sequences. We review our study for the P-wave velocity structure of the whole mantle, that are obtained by inverting first arrival times with better resolution under the Western Pacific. It reveals the fate of subducting slabs of lithosphere. The P-wave and PcP-wave arrival time data are also analyzed to get a velocity structure of the core-mantle boundary. These results are already published or will be published soon in the international journals.
The data obtained in this research project are supplied by the Data Center of the Ocean Hemisphere Center, Earthquake Research Institute, University of Tokyo.

Report

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

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Nakayama,W.,M.Takeo: "Slip History of the 1994 Sanriku-Haruka-Oki,Japan,Earthquake" Bull.Seismo.Soc.Am.87. (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Obayashi,M.,Y.Fukao: "P and PcP travel time tomography for the core-mantle boundary" J.Geophys.Res.102. (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ide,S.,M.Takeo,Y.Yoshida: "Source Process of the 1995 Kobe Earthquake" Bull.Seismo.Soc.Am.86. 547-566 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Nakayama, W., & M.Takeo: "Slip History of the 1994 Sanriku-Haruka-Oki, Japan, Earthquake" Bull.Seismo.Soc.Am.87. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Obayashi, M., & Y.Fukao: "P and PcP travel time tomography for the core-mantle boundary" J.Geophys.Res.102. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ide, S., M.Takeo, & Y.Yoshida: "Source Process of the 1995 Kobe Earthquake" Bull.Seismo.Soc.Am.86. 547-566 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Obayashi, M., T.Sakurai, & Y.Fukao: "The 3D Structure of the Mantle from Travel Time Inversion" J.Geography. 104. 934-940 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Nakayama,W.,M.Takeo: "Slip History of the 1994 Sanriku-Haruka-Oki,Japan,Earthquake" Bull.Seismo.Soc.Am.87. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Obayashi.M.,Y.Fukao: "P and PcP travel time tomography for the core-mantle boundary" J.Geophys.Res.102. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Ide,S.,M.Takeo,Y.Yoshida: "Source Process of the 1995 Kobe Earthquake" Bull.Seismo.Soc.Am.86. 547-566 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Ide, S., M. Takeo, Y. Yoshida: "Source Process of the 1995 Kobe Earthguake" Bull. Seismo. Soc. Am.86. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大林政行・桜井太郎 深尾良夫: "走時インバージョンによるマントル3次元構造" 地学雑誌. 104. 934-940 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2017-10-10  

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