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Equations of state of the Earth

Ahrens, Thomas J. (1975) Equations of state of the Earth. Reviews of Geophysics, 13 (3). pp. 335-339. ISSN 8755-1209.

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The major results of research in the United States for 1971–1974 in the areas of static, high-pressure X ray, ultrasonic and shock wave measurements, and progress in theoretical equations of state are summarized. This 4-year period has seen the massive accumulation of new data pertinent to describing the properties, and to some extent geodynamic processes, of the upper mantle as well as exposing the gauntlet of scientific challenge with regard to our lack of detailed understanding of the major changes in crustal seismic velocities, which seem to offer so much promise for earthquake prediction. In the area of very high pressure geophysics, another challenging problem uncovered is the question of explaining the low adiabatic gradient in the outer core, which seems to be required to retain liquid iron alloy material at the melting point. Important advances in what until recently has been quite empirical elastic moduli ‘systematics’ have demonstrated how ionic radii and ionic packing densities may be quantitatively employed to predict unmeasured equations of state as well as tie together an ever increasing body of data for the elasticity of compounds which are crystal-chemical analogs of mantle minerals.

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Additional Information:Copyright © 1975 by the American Geophysical Union. Preparation of this review was supported by NSF grant GA-39042X. I appreciate the assistance offered by D. H. Chung, S. Bless, and B. Sloan. Contribution 2583, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.
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Caltech Division of Geological and Planetary Sciences2583
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Official Citation:Ahrens, T. J. (1975), Equations of state of the Earth, Rev. Geophys., 13(3), 335–339, doi:10.1029/RG013i003p00335.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51284
Deposited By: George Porter
Deposited On:05 Nov 2014 18:30
Last Modified:03 Oct 2019 07:31

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