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Estimating Radiated Seismic Energy over 17 Orders of Magnitude

Research Project

Project/Area Number 12640407
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MORI James Jiro  DPRI, Professor, 防災研究所, 教授 (50314282)

Co-Investigator(Kenkyū-buntansha) KUGE Keiko  Faculty of Science, Kyoto University, Associate Professor, 大学院・理学研究科, 助教授 (50234414)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsRadiated Energy / Apparent Stress / K-Net / Source Parameters / K-Net / Source Paramenters / Radiated Energy / Source Parameters
Research Abstract

This research investigated the scaling of radiated seismic energy as a function of earthquake size. Radiated energy has only recently been studied and previous reliable estimates are few. However, new instrumentation, such as K-Net in Japan allows more reliable estimates. So this research provides new results about the estimates of radiated energy of earthquakes.
There were 3 main studies.
1. Energy estimates for shallow (0-50 km) moderate (M4-6) earthquakes in Japan. We analyzed 115 earthquakes. To make reliable estimates of energy, station corrections for several hundred K-Net sites were determined. We found that the energy is approximately proportional to the moment. However, since the magnitude range is limited, it is difficult to see any trend from just these data. These results are similar to results for shallow earthquakes in California.
2. We compared of energy estimates of shallow and deep earthquakes. 32 shallow and 37 deep events from Hokkaido and Tohoku were analyzed. To make reliable energy estimates, site corrections and path attenuation were determined for this data set. When comparing energies of shallow and deep earthquakes, the shallow earthquakes show an increase of energy to moment ratio, as a function of earthquake size. While for deep earthquakes the energy to moment ratio is constant as a function of earthquake size.
3. We did some detailed work on aftershocks of the 1994 Northridge, California earthquake. This works confirms that for shallow earthquakes in California, the ratio of energy to moment increases as a function of earthquake size.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] H.Kobayashi, J.Mori, K.Sato: "Estimates of Radiated Energy for Moderate Shallow Earthquakes in Japan"Eos, Transactions, American Geophysical Union. 81. F843 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Kase, K.Kuge: "Selection of fault geometry using reconstruction of dynamic source parameters"Eos, Transactions, American Geophysical Union. 81. F886 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Mori, K-F, Ma: "Slip Velocity Estimates of the 1999 Chi-Chi, Taiwan, Earthquake New Observations of Fault Dynamics"Eos, Transactions, American Geophysical Union. 81. WP140 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Kobayashi, J. Mori, K. Sato: "Estimates of Radiated Energy for Moderate Shallow Earthquakes in Japan"Eos, Transactions, American Geophysical Union. 81. F843 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Kase, K. Kuge: "Selection of fault geometry using reconstruction of dynamic source parameters"Eos, Transactions, American Geophysical Union. 81. F886 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J. Mori, K-F, Ma: "Slip Velocity Estimates of the 1999 Chi-Chi, Taiwan, Earthquake: New Observations of Fault Dynamics"Eos, Transactions, American Geophysical Union. 81. WP140 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Kobayashi,J.Mori,K.Sato: "Estimates of Radiated Energy for Moderate Shallow Earthquakes in Japan"Eos,Transactions, American Geophysical Union. 81. F843 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Kase,K.Kuge: "Selection of fault geometry using reconstruction of dynamic source parameters"Eos, Transactions, American Geophysical Union. 81. F886 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.Mori,K-F,Ma: "Slip Velocity Estimates of the 1999 Chi-Chi, Taiwan, Earthquake : New Observations of Fault Dynamics"Eos, Transactions, American Geophysical Union. 81. WP140 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2021-04-07  

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