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Acoustic double refraction in low-porosity rocks

Todd, Terry and Simmons, Gene and Baldridge, W. Scott (1973) Acoustic double refraction in low-porosity rocks. Bulletin of the Seismological Society of America, 63 (6). pp. 2007-2020. ISSN 0037-1106.

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Anisotropy in physical properties of rocks can arise from preferred mineral orientation, mineral layering, nonhydrostatic stress, and anisotropic crack distribution. For instance, all of the following cause acoustic double refraction: preferential orientation of olivine grains in dunites, alternating layers in laboratory-sized samples of such mineral pairs as olivine-feldspar, wollastonite-diopside, and garnet-pyroxene, alternating layers of basalt flows and lunar breccias, anisotropy in crack distribution of most granites, and anistropy in crack distribution induced by uniaxial stress. We discuss, both experimentally and theoretically, shear-wave propagation in these rock types and indicate how the laboratory data may be applied to the interpretation of the anisotropy observed in the Earth's crust and upper mantle. We discuss the possibility of elastic anisotropy in the Moon.

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Additional Information:© 1973 Seismological Society of America. Manuscript received April 27, 1973. We wish to thank Dorothy Richter for her analysis of our rock samples, Herbert Wang for his valuable advice throughout the course of this work, and NASA Contract NGR-22-009-540 for support of this work. We are especially grateful to Andrew Fletcher, H. E. Fletcher Co., North Chelmsford, Massachusetts, for supplying the Chelmsford granite samples.
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Issue or Number:6
Record Number:CaltechAUTHORS:20140904-154711165
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49258
Deposited By: Tony Diaz
Deposited On:05 Sep 2014 23:18
Last Modified:03 Oct 2019 07:12

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