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Elasticity of water-saturated rocks as a function of temperature and pressure.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.
Document ID
19730050469
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Takeuchi, S.
Simmons, G.
(MIT Cambridge, Mass., United States)
Date Acquired
August 7, 2013
Publication Date
June 10, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Geophysics
Accession Number
73A35271
Funding Number(s)
CONTRACT_GRANT: NGR-22-009-540
Distribution Limits
Public
Copyright
Other

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