深層アレー観測記録のシミュレーション解析と基盤の不整形性の影響

概要

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Seismograms had been recorded in the deep vertical array installed at the reclaimed area of Higashi-Nada ward, Kobe city (KHG) including an observatory point in the deep seismic bedrock layer, which is suitable for investigation of ground-motion amplification due to deep irregular subsurface structure. First, the velocity structure beneath the KHG site is estimated using seismograms of 5 earthquakes based on the genetic algorithm. Next, the ground motion amplification at KHG site is analyzed using the 2D basin-edge structure. The 2D analyses well reproduce amplification from the bottom to the top point, which cannot be explained by only the horizontally layered model. The ground motions at the top of KHG as well as several neighboring surface points are successfully simulated using the records at the bottom of the KHG during the 2000 Tottori-ken Seibu earthquake. The basin-edge structure mostly affects the ground motion amplification in the period range of 1-2 s. at the KHG site.
社団法人日本建築学会の論文
2003-08-30