A STUDY ON SITE AMPLIFICATION FACTOR AT ONIKOBE AREA

Abstract

 The site amplification factor was evaluated with temporary seismic observation datum at Onikobe area that has relatively small basin subsurface structure. Microtremor measurements were carried out in order to evaluate deep subsurface profile using dispersion curves and horizontal-to-vertical (H/V) spectral ratio. The site amplification factor was compared with the transfer function calculated by two-dimensional seismic response analyses with different incident angles of seismic motion.
 The site amplification factor was in between the average value and the average plus one standard deviation values of the transfer function calculated by two-dimensional analyses. It was regarded as comparatively good agreement considering the range of incident angles of seismic motions used in the calculations of the site amplification factor.