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Sonic and ultrasonic velocities: Theory Versus experiment
Author(s) -
Murphy William F.
Publication year - 1985
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl012i002p00085
Subject(s) - poromechanics , ultrasonic sensor , saturation (graph theory) , mechanics , shear waves , pore water pressure , low frequency , shear (geology) , scattering , materials science , physics , porous medium , geology , porosity , acoustics , optics , geotechnical engineering , composite material , mathematics , combinatorics , astronomy
Longitudinal and shear wave velocities have been measured at 2 kHz and 200 kHz. The measurements were made in a granite as a continuous function of partial water saturation and effective pressure. The pore space of the granite consists of micro‐cracks. The low frequency results compare favorably to the low frequency limit of poroelastic theory. Poroelastic theory assumes that the pore space is connected. On the other hand, the ultrasonic results are better described by effective medium scattering theories: the self‐consistent and the average T‐matrix approximations. Each of these theories assume that the microcracks are not connected.