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COLLEGE OF OCEANOGRAPHY OREGON STATE UNIVERSITY, CORVALLIS, OREGON 97331
LAMONT-DOHERTY GEOLOGICAL OBSERVATORY AND DEPARTMENT OF GEOLOGICAL SCIENCES OF COLUMBIA UNIVERSITY, PALISADES, NEW YORK 10964
Abstract
We measure the apparent attenuation of P waves propagating through a three-dimensional scattering medium (a three-dimensional aluminum block containing a random assemblage of cylindrical voids). The observed apparent attenuation is compared to that predicted by a single scattering approximation. At low frequencies, both the amount of attenuation and its variation with frequency are well predicted. At intermediate and high frequencies, the agreement is poorer. Observed phase shifts are very different from those predicted by the Kramers-Krönig relations.
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