SPATIAL VARIATION OF Q_S-VALUE ESTIMATED FROM DOUBLE SPECTRAL RATIO OF STRONG MOTION RECORDS

Abstract

Spatial variation of Q_S-value is estimated using double spectral ratio of strong motion records. Q_S-value in the central part of Aichi Prefecture is higher than that in the eastern and western parts of Aichi Prefecture. Median Tectonic Line passes through the eastern part and Yoro fault zone exists in the western part, which would be the cause of the low Q_S-value. The spatial variation of Q_S-value may reffect the heterogeneity of the crustal structure such as asperity distribution in the crust.