A Method of Estimation of Earthquake Ground Motion Using Nearby Records and Microtremors H/V Spectral Ratio

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  • 強震観測点の記録と常時微動Ｈ／Ｖスペクトル比を利用した近傍の未観測点の強震動推定法
  • キョウシン カンソクテン ノ キロク ト ジョウジ ビドウ H Vスペクトルヒ オ リヨウシタ キンボウ ノ ミカンソクテン ノ キョウシンドウ スイテイホウ

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Abstract

A method of estimation of earthquake ground motion using nearby earthquake ground motion record and microtremors horizontal to vertical (H/V) Fourier spectral ratio is presented. In this formulation, an earthquake ground motion is estimated from the earthquake ground motion recorded in the nearby observation site by using the correction factors which consist of the difference correction factor between the H/V spectral ratios of the strong motion record and the microtremors at the strong motion observation site β, the normalized microtremors H/V spectral ratio of the both sites by their peak values, and the site factor of vertical ground motions γ. By using the observed microtremors and earthquake ground motions in the Miyazaki and Fukuoka Prefectures, the presented estimation method is examined. This examination demonstrates a potential capability of the presented method in the frequency range from 0.5Hz to 10Hz, especially around the predominant frequency of the site.

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