地震動予測のための深層地盤P・S波速度の推定

NDLデジタルコレクション 被引用文献45件

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  • Estimation of P- and S- Wave Velocities in Deep Soil Deposits for Evaluating Ground Vibrations in Earthquake

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The following two kinds of empirical relations are derived : 1) relations between the P-wave velocities and geological factors (facies, time, and depth), based on oil well data in Akita prefecture; 2) relations between the S-wave velocities and the P-wave ones, based on published and new data from in situ velocities measurements in relatively deep boreholes in Japan. Combination of the above two relations provides means for estimating the S-wave velocities from geological factors. A VSP experiment was carried out in a well of 1.3 km depth in Akita prefecture to provide this study with S- and P-wave data of oil field area. To demonstrate the purpose of this study, calculations of ground vibrations due to the vertically incident SH-waves are conducted for a two-dimentional seismic structure model corresponding to a typical sedimentary basin in Akita prefecture.

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