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Elasticity of water-saturated rocks as a function of temperature and pressure

1973; American Geophysical Union; Volume: 78; Issue: 17 Linguagem: Inglês

10.1029/jb078i017p03310

2156-2202

Shozaburo Takeuchi, Gene Simmons,

Seismic Imaging and Inversion Techniques

Journal of Geophysical Research (1896-1977)Volume 78, Issue 17 p. 3310-3320 Elasticity of water-saturated rocks as a function of temperature and pressure Shozaburo Takeuchi, Shozaburo TakeuchiSearch for more papers by this authorGene Simmons, Gene SimmonsSearch for more papers by this author Shozaburo Takeuchi, Shozaburo TakeuchiSearch for more papers by this authorGene Simmons, Gene SimmonsSearch for more papers by this author First published: 10 June 1973 https://doi.org/10.1029/JB078i017p03310Citations: 16AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Compressional and shear wave velocities of water-saturated rocks were measured as a function of both pressure and temperature near the melting point of ice to confining pressure of 2 kb. The pore pressure was kept at about 1 bar before the water froze. The presence of a liquid phase (rather than ice) in microcracks of about 0.3% porosity affected the compressional wave velocity by about 5% and the shear wave velocity by about 10%. The calculated effective bulk modulus of the rocks changes rapidly over a narrow range of temperature near the melting point of ice, but the effective shear modulus changes gradually over a wider range of temperature. This phenomenon, termed elastic anomaly, is attributed to the existence of liquid on the boundary between rock and ice due to local stresses and anomalous melting of ice under pressure. We predict that the elastic anomaly will exist in any polyphase system near the melting temperature of the inclusions (Tm) whenever dTm/dp < 0. Except for the elastic anomaly, the variation of elasticity of saturated rocks can be explained by Walsh's equations with an assumed porosity and an aspect ratio of the inclusions. The crack porosity of granite is 0.0022 ± 0.0003 at 1 bar, and it decreases to a value of less than 0.0004 ± 0.0003 at 1 kb. The aspect ratio is 0.0043 ± 0.0003 at 1 bar, and it decreases to 0.0017 ± 0.0003 at 1 kb. References Adams, L. H., E. D. Williamson, The compressibility of minerals and rocks at high pressure, J. Franklin Inst., 195, 475, 1923. Anderson, D. L., C. Sammis, Partial melting in the upper mantle, Phys. Earth Planet. Interiors, 3, 41, 1970. Bass, R., D. Rossberg, G. Ziegler, Die elastischen Konstanten des Eises, Z. Phys. Ed., 149, 199, 1957. Birch, F., The velocity of compressional waves in rocks to 10 kilobars, 1, J. Geophys. Res., 65, 1083, 1960. 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Wyllie, P. J., Role of water in magma generation and initiation of diapiric uprise in the mantle, J. Geophys. Res., 76, 1328, 1971. Zisman, W. F., Compressibility and anisotropy of rocks at and near the Earth's surface, Proc. Nat. Acad. Sci. USA, 19, 666, 1933. Citing Literature Volume78, Issue1710 June 1973Pages 3310-3320 ReferencesRelatedInformation