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3-D modelling of Crustal movements and tectonic loading in and around Japan

Research Project

Project/Area Number 07454103
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

MATSU-URA Mitsuhiro  The University of Tokyo, Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (00114645)

Co-Investigator(Kenkyū-buntansha) SATO Toshinori  The University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (70222015)
HAMAMOTO Yozo  The University of Tokyo, Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (90011709)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥5,500,000 (Direct Cost: ¥5,500,000)
Keywordsearthquake cycle / crustal movement / tectonic stress accumulation / viscoelasticity / fault constitutive law / 3-D modelling / retative plate motion / 地殻運動 / テクトニック応力 / 三次元モデリング
Research Abstract

In the period of 1995-1996 we have conducted a research for constructing 3-D model of crustal movements and tectonic loading in and around Japan and obtained the following results.
(1)Taking the area of 3000km*3000km including Japanese Islands as a modelling region, we collected the basic geophysical data, such as surface topography, gravity anomalies, crustal structure, and hypocenter distributions of earthquakes.
(2)Applying a new inversion technique based on Akaike's Baysian Information Criterion(ABIC) to the hypocenter data of earthquakes, we determined the three-dimensional geometry of interfaces between the Pacific, North American, Philippine Sea, and Eurasian plates.
(3)We developed an efficient algorithm for computing three-dimensional viscoelastic reponse to a unit step-slip on a plate boundary. Using this algorithm, we numerically simulated the accumulation process of tectonic stress due to relative plate motion. Through the numerical simulation we demonstrated that the mechanisms of tectonic loading are essentially different between the plate interior and the plate interface. The stress accumulation at a locked portion on the plate interface is partly due to viscous drag at the base of the lithosphere(base loading) and partly due to dislocation pile-ups at horizontal edges of the locked portion(edge loading).
(4)With an inversion technique based on ABIC we analyzed levelling date for 1893-1983 on Shikiku, southwest Japan. Through the inversion analysis we reconstructed the pattern of crustal movements over the last 120 years including the occurrence of the 1946 Nankaido earthquake. The result clearly shows that the crustal movements on Shikoku include significant secular vertical motion in addition to cyclic motion related to the periodic occurrence of large interplate earthquakes at the Nankai trough.

Report

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

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Y.Fukahata: "Crustal movements in Shikoku,southwest Japan,inferved from inversion analysis of levelling data using ABIC" Tectonophysics. 257. 239-252 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 松浦 充宏: "地震発生予測と地殻活動モデリング" 月刊地球. 18. 824-828 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Matsu'ura: "Loading mechanism and scaling relations of large interplate earthquakes" Tectonophysics. Special Issue (発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Fukahata, Y., C.Honsho, and M.Matsu'ura: "Crustal movements in Shikoku, southwest Japan, inferred from inversion analysis of levelling data using ABIC" Tectonophysics. 257. 239-252 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Matsu'ura, M.: "Forecast of earthquake generation and crustal activity modelling" Chikyu Monthly. 18, (in Japanese).824-828 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Matsu'ura, M.and T.Sato: "Loading mechanism and scaling relations of large interplate earthquakes" Tectonophysics. Special Issue, (accepted).(1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Fukahata et al.: "Crustal movements in Shikoku,south west Japan,inferred from inversion analysis of levelling data using ABIC" Tectonophysics. 257. 239-252 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 松浦充宏: "地震発生予測と地殻活動モデリング" 月刊地球. 18. 824-828 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Matsu′ura: "Loading mechanism and scaling relations of large interplate earthquakes" Tectonophysics. Special Issue(発表予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] B. Shibazaki: "Foreshocks and pre-events associated with the nulceation of large earthquakes" Geophysical Reaerch Letters. 22. 1305-1308 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Fukahata: "Crustal movements in shikoku,southwest Japan,inferred from inversion analysis of levelling data using ABIC.21GC01:Tectonophysics" (in press). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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