ASA 126th Meeting Denver 1993 October 4-8

2aUW9. Reflections and diffractions from facet-wedge constructions: Acoustic experiments and theory.

Saimu Li

Dept. of Geol. and Geophys., Weeks Hall, Univ. of Wisconsin, Madison, WI 53706

DeZhang Chu

Woods Hole Oceanogr. Inst., Woods Hole, MA 02543

C. S. Clay

University of Wisconsin, Madison, WI 53706

The higher-order diffractions of transient pressure signal from a combination of hard finite facet wedge of 45 deg and an infinite plane have been studied experimentally and theoretically. Experiments used a spark point source with a separated receiver at the same side of the wedge. The reflected pressure signals were well separated in time domain. Higher-order diffractions from the apex and troughs of the wedge were observed. The studies were concentrated on the reflections from the facets and the diffractions. The experimental geometry is different from Medwin et al. [J. Acoust. Soc. Am. 83, 1794--1803 (1988)]. Biot and Tolstoy's exact wedge solution [J. Acoust. Soc. Am. 29, 381 (1957)] and extensions were used to compare experimental data and theory.