A STUDY ON CONSTRUCTING 3-D BASIN STRUCTURE MODELCORRESPONDING TO INFORMATIONAVAILABLE IN THE TARGET AREA

摘要

Practical procedure for constructing 3-D basin structure model is proposed for strong motion simulation.We produced smoothed 3-D boundary structure model using spline functions from information as muchas it is available in target area. The model can be used for long period 3-D basin response of strongground motion. The proposed modeling procedure was applied to the Osaka Basin, Japan. Wemodeled layered velocity structure of the Osaka Basin with 3 sedimentary layers and bedrock. DerivedOsaka 3-D sedimentary basin model with velocity structure was verified through long period (T > 1sec.)waveform simulation using 3-D finite difference method. The results of the verification were fairlygood. The proposed modeling procedure can be a useful tool to construct basin structure models forlong period strong motion calculation at target sites with any accuracy that corresponds to quality andquantity of available information at the site.