Publication Date:
1986-01-01
Description:
Wave propagation in a cut-ground is determined by using the Equivalent Mass-System Model, a type of finite difference method with some modification. A point-concentrated force is applied on a lower surface. Waves observed are concerned with the resultant diffractions at lower and upper corners, and with fraction of step-height H to wavelength λ. Wave characteristics are determined from the inclination of the time-distance curves, and are justified by the orbital motions. The leading part of waves is a direct Rayleigh pulse on a lower surface; a Rayleigh pulse across the lower corner and a Rayleigh pulse reflected from the upper corner on the cliff-face; and an SV pulse diffracted at the lower corner from the direct Rayleigh wave and a Rayleigh pulse travelling through the whole surface on the upper surface. The maximum amplitude of Rayleigh pulse across the step to the step-height is exponentially decaying: Exp(— 0.1 H/λ). Some comments on diffraction at the corner are given. © 1986, The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan. All rights reserved.
Print ISSN:
0022-3743
Electronic ISSN:
1884-2305
Topics:
Geosciences
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