地震波散乱構造の推定

DOI Web Site 被引用文献1件 参考文献60件
  • 松本 聡
    九州大学大学院理学研究院・地震火山観測研究センター

書誌事項

タイトル別名
  • A Review on Structure of the Earth Using Scattered Seismic Waves by Heterogeneity
  • ジシンハ サンラン コウゾウ ノ スイテイ

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抄録

Recent observational studies about structure of the earth by using scattered waves provided us with knowledge that elastic parameters like a velocity in the earth’s crust and upper mantle are heterogeneous in the range from few tens meter to kilometer scale. In addition, the heterogeneity varies from region to region with 3-4 orders in mean free path. Especially, in volcanic area, the scattering strength becomes extremely strong. In this review, we introduce researches for small scale heterogeneities. There are two major approaches to estimate it. One is analysis of envelope around direct wave arrival. Most of the studies are based on Markov approximation. The method can solve relatively longer scale length than wavelength of seismic waves. Another is in coda part using backward scattered waves. For this analysis, there are models depending on strength of heterogeneity (i.e., single-, multiple-scattering, and diffusion models). Based on the models, many studies have estimated relative scattering strength by using data in regional seismic network and/or seismic array. Spectral structure of heterogeneous property in short wavelength is useful to get character of a medium. Various approaches for scattered wave provide the spectral structure in wide wave number range. This may help us to understand mechanism of earthquake occurrence and volcanic eruption.

収録刊行物

  • 地震　第２輯

    地震　第２輯 61 (Supplement), 209-216, 2009

    公益社団法人 日本地震学会

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