Abstract

In a southeastern part of Kyoto basin, we observed the reflected waves from the basement some hundred meter deep by using air gun as a source and signal-enhancement technique by stacking. Both the velocity up to and the depth of the basement were greater than those previously given by KITSUNEZAKI et al. (1971). It is useful to use reflected waves for exploring sharp boundary, such as a basement, because it is relatively easy to observe them at far distances where surface waves are not disturbing. Synthetic seismograms also support the prospect to detect reflected phases from a sharp boundary.

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