S-wave velocity structures and ground motion characteristics of loam terraces: The case of the Utsunomiya area, Tochigi Prefecture, central Japan

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  • ローム台地のS波速度構造と地盤震動特性：栃木県宇都宮地域を例に
  • ローム ダイチ ノ Sハ ソクド コウゾウ ト ジバン シンドウ トクセイ : トチギケン ウツノミヤ チイキ オ レイ ニ

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<p>We examined the influence of volcanic ash soil (loam beds) overlying fluvial terraces on ground motion characteristics in the Utsunomiya area, Tochigi Prefecture, central Japan. Microtremor surveys reveal that the loam beds exhibit relatively low S-wave velocities (130-150 m/s) and that the average S-wave velocities to the depth of 30 m (AVS30) and the peak frequencies of horizontal-to-vertical (H/V) spectral ratios become lower in higher terraces, due to the influence of thick loam beds overlying the gravelly terrace deposits. In addition, high AVS30 values and high peak frequencies of H/V spectra are observed in the lowlands along rivers, because these areas are underlain mainly by fluvial gravelly deposits without loam beds. Ground motions in a relatively low frequency range (e.g., 1.5-2.0 Hz) are more amplified on higher terraces and hills than on lower terraces or lowlands.</p>

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