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A feasibility test of CMT inversion using regional network of broad-band strong-motion seismographs for near-distance large earthquakes

Earth, Planets and Space volume 51, pages 247–254 (1999)Cite this article

Abstract

When a large earthquake occurs in and around the Japanese Islands, we should immediately determine the size and the fault geometry of the earthquake to mitigate earthquake disasters. Broad-band, strong-motion data of near-distance large earthquakes are used to investigate the possibility of CMT inversion. We perform a moment tensor inversion using the data sets of the 1993 Hokkaido Nansei-oki earthquake (MJMA 7.8), the 1994 Hokkaido Toho-oki earthquake (MJMA 8.1) and the 1994 Sanriku Haruka-oki earthquake (MJMA 7.5). The accuracy of the solutions is examined by comparison with the solutions derived from global data sets, which reveals that the mechanism and moment magnitude are quite adequate for the purpose. Numerical experiments are made to analyze the influence of the source finiteness on the solutions. The numerical experiments suggest that the influence of the source finiteness on the mechanism retrieval is smaller than that on the moment retrieval. We suggest the installation of a network system of broad-band, strong-motion seismographs in the Japanese Islands.

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Author notes

  1. Ikuo Cho

    Present address: Department of Geophysics, Kyoto University, Kyoto, Japan

Authors and Affiliations

  1. Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan

    Ikuo Cho

  2. Department of Geophysics, Kyoto University, Kyoto, Japan

    Ichiro Nakanishi

  3. Department of Earth and Environmental Sciences, Hirosaki University, Hirosaki, Japan

    Tamao Sato

Authors
  1. Ikuo Cho
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  2. Ichiro Nakanishi
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  3. Tamao Sato
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Correspondence to Ikuo Cho.

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Cho, I., Nakanishi, I. & Sato, T. A feasibility test of CMT inversion using regional network of broad-band strong-motion seismographs for near-distance large earthquakes. Earth Planet Sp 51, 247–254 (1999). https://doi.org/10.1186/BF03352228

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  • DOI: https://doi.org/10.1186/BF03352228

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