Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; February 1968; v. 58; no. 1; p. 171-178
© 1968 Seismological Society of America
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A two-dimensional ultrasonic model study of compressional and shear-wave diffraction patterns produced by a circular cavity

T. L. TENG1 and F. T. WU

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIADIVISION OF GEOLOGICAL SCIENCES

Abstract

Diffraction patterns of compressional (P) and shear (SV) waves produced by a circular hole were experimentally obtained on a two-dimensional ultrasonic model. The shapes of the Fresnel patterns were found to depend on, 1) {alpha}/{lambda}, the ratio of the radius of the cylinder to the wavelength; and, 2) the wave type. The transitional zone between the illuminated and the shadow regions broadens, and the half-amplitude point shifts away from the geometrical shadow as {alpha}/{lambda} decreases. For comparable {alpha}/{lambda}, the shadow boundary of the SV wave appears to start much earlier than that of the P wave.

Footnotes

1 Now at Department of Geological Sciences, University of Southern California.






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