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The transition between 2- and 3-dimensional waves in seismic models

PHYSICS DEPARTMENT UNIVERSITY OF ADELAIDE, ADELAIDE, SOUTH AUSTRALIA 5001

Abstract

Experimental determinations of the velocity of compressional waves in plates of varying thickness are presented. Measurements indicate that if the thickness of the plate is less than about 0.2 of the wavelength, the concept of propagation in a "thin" 2-dimensional plate is valid. For thicknesses greater than this and up to about 0.75 of the wavelength, the velocity steadily increases until the "3-dimensional" propagation velocity is reached.