A METHOD OF ESTIMATING EARTHQUAKE GROUND MOTION USING MIROTREMOR H/V SPECTRAL RATIO

Abstract

A method of estimating earthquake ground motion using microtremor horizontal to vertical (H/V) Fourier spectral ratio is presented. In this method, 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 microtremor H/V spectral ratio of the both sites (the reference site and estimation site), the correction factor of the difference between the microtremor H/V spectral ratio and the earthquake ground motion H/V spectral ratio β, and the site factor of vertical ground motions γ. By using the observed microtremor records and earthquake ground motions in the Miyazaki and Fukuoka Prefectures, the presented estimation method is examined. And also the error of estimation of Fourier spectral amplitude of earthquake horizontal ground motion is discussed.