Attenuation and velocities of P- and S-waves in dry and saturated crystalline and sedimentary rocks at ultrasonic frequencies

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doi: 10.1016/S0079-1946(97)00081-5
Authors:Liu, B.; Kern, H.; Popp, T.
Author Affiliations:Primary:
Mineralogisch-Petrographisches Institut, Kiel, Federal Republic of Germany
University of Science and Technology of China, China
Volume Title:Solid Earth
Volume Authors:Richter, A. K.
Source:Solid Earth, A. K. Richter. Physics and Chemistry of the Earth, 22(1-2), p.75-79. Publisher: Pergamon, Oxford-New York-Toronto, International. ISSN: 0079-1946
Publication Date:1997
Note:In English. 5 refs.Special issue; illus.
Summary:Velocities and Q-values for P- and S-waves and their directional dependence have been determined for several silicate rocks (dry and saturated) exhibiting different porosities. Measurements were made at confining P of 20-600 MPa. Velocities and Q-values exhibit a steep non-linear increase with increasing confining P, due to progressive closure of microcracks. Q increases steeply ^ foliation as P increases, and the values at high P are higher than those observed [vertical bar][vertical bar] foliation. The reverse is true for the velocities. Both increase of confining P and saturation of pore space reduce the anisotropy caused by oriented microcracks. Saturation affects Q and velocity more markedly in the high-porosity rocks. From the laboratory data, it can be concluded that changes in velocity and Q-values are, at least partly, different in origin. The simultaneous measurements of velocities and Q provide information on the mechanisms of attenuation, especially for an assessment of whether the predominant damping mechanism is in shear or in compression. [R.E.S.]
Subjects:Attenuation; Body waves; Crystalline rocks; Elastic waves; Experimental studies; Frequency; P-waves; Q; S-waves; Saturated materials; Sedimentary rocks; Seismic waves; Ultrasonic methods; Velocity
Abstract Numbers:98M/2159
Record ID:1998020911
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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