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

Abstract

Spatial variation of Q_S-value can be estimated using double spectral ratio of strong motion records. Q_S-value estimated at the central Aichi Prefecture is high relatively to that in the eastern and western parts of Aichi Prefecture. Median Tectonic Line passes through the eastern part and an active fault zone exists in the western part, which is supposed to be the cause of the low Q_S. The spatial variation of Q_S-value may be closely related to the heterogeneity of the crustal structure such as asperity distribution in the crust.