Active Fault and Paleoearthquake Researches No. 7 (2007)

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Cover figure

Bird view of the Ishikari and Yūfutsu sedimentary basin structure model.

(Top) Topography. (Middle) Top of the Neogene layer (Bottom) Top of the seismic bedrock. For the purpose of computation of long-period ground motion, we compiled existing geological maps, reflection/refraction seismic surveys, gravity and borehole logging data to construct three dimensional velocity structure data for the sedimentary basin. See reports by Yoshida et al. (pages 1-29).