表層の地盤特性を拘束条件にしたS波スペクトルのインバージョンによるサイト特性の評価

DOI Web Site Web Site 被引用文献13件 参考文献23件
  • 山中 浩明
    東京工業大学大学院総合理工学研究科
  • 中丸 明子
    東京工業大学大学院総合理工学研究科 現所属: 平塚市立神田中学校
  • 栗田 勝実
    東京工業大学大学院総合理工学研究科
  • 瀬尾 和大
    東京工業大学大学院総合理工学研究科

書誌事項

タイトル別名
  • Evaluation of Site Effects by an Inversion of S-wave Spectra with a Constraint Condition Considering Effects of Shallow Weathered Layers
  • ヒョウソウ ノ ジバン トクセイ オ コウソク ジョウケン ニ シタ Sハ ス

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抄録

An inversion method to separate effects of source, propagation path, and local site from S-wave spectra is applied to earthquake observation data obtained in the southwestern Kanto plain, Japan. First, effects of building in which seismometer is installed are evaluated from spectral ratio of microtremor records that were simultaneously obtained in the building and at the free surface in its vicinity for correcting the S-wave spectra. Theoretically calculated amplification factor due to shallow weathered layers and the spectral ratio of microtremors at a rock site are used as a constraint condition in our inversion. Estimated source spectra show a ω-2 decay with increasing frequency. Qs-value along the propagation path in the Earth's crust is in an agreement with results of previous studies. Strong site-dependency was found in the separated site amplification factors. In particular, soft soil site has an amplitude decrease in frequencies higher than 2Hz. The amplification factors were well explained by theoretical amplifications of reverberating S-waves in subsurface structural models from geophysical surveys. These results suggest the appropriateness of the constraint condition used in our inversion.

収録刊行物

  • 地震　第２輯

    地震　第２輯 51 (2), 193-202, 1998

    公益社団法人 日本地震学会

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