ESTIMATION OF SUBSURFACE STRUCTURE OF TOTTORI PLAIN USING MICROTREMORS

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  • 微動による鳥取平野の地盤構造推定
  • ビドウ ニ ヨル トットリ ヘイヤ ノ ジバン コウゾウ スイテイ

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To estimate the subsurface structures of Tottori plain, a microtremor observations were carried out. This area was severely damaged by the 1943 Tottori earthquake (M7.2), with damage concentrated in the alluvial plain. Microtremors were observed using seismic arrays (7 sites) and a 3-component single site observation (413 points). The observed data were analyzed using the spatial auto correlation (SPAC) method or the horizontal-to-vertical spectral ratio (H/V). S-wave velocity structures to the depth of about 1km were estimated by the analysis of array observational records. The distribution of the peak period of H/V was derived by the analysis of single site observational records.

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