Abstract
Seismic fragility is influenced not only by subsurface profiles above engineering bedrock but also by deep subsurface profiles below engineering bedrock. We aim at presenting the method of seismic zoning in view of deep subsurface profile by use of both microtremor and strong motion record. The method employs the horizontal-to-vertical spectral ratios of microtremor to classify the deep subsurface structures and site amplification factor by the spectral inversion of strong motion. We showed an example of seisimic zoning for Mikawa port by the proposed method. It was also shown that frequency characteristic of site amplification factors and horizontal-to-vertical spectral ratios were in good agreement.
