強震ネットワーク(K-NET)データから推定した水平・上下最大加速度の距離減衰式

概要

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We inferred the attenuation relationships of peak ground accelerations for horizontal and vertical components with distances from the Kyosin network data. We first examined the effects of focal depths and fault types. For the horizontal component, we introduced focal depth as an argument into the regression formula of the attenuation relationships, but not for fault types. Then, we inferred the attenuation relationships of peak horizontal ground accelerations as a function of focal depth and site conditions in addition to distance and magnitude. For the vertical component, the ratios of peak vertical accelerations to peak horizontal accelerations were estimated as a function of the focal depth alone except for rock sites. Furthermore, numerical simulation indicated that an increase in the stress parameter with the focal depth and large damping in deep propagating media of the Earth (30km to 100km) account for the dependence of the attenuation relationship on the focal depth.
社団法人日本建築学会の論文
2003-09-30