Temperature fluctuation and thermodynamic properties in Earth's lower mantle: An application of the complete travel time equation of state

Akira Yoneda; Hartmut Spetzler

doi:10.1016/0012-821X(94)90118-X

Temperature fluctuation and thermodynamic properties in Earth's lower mantle: An application of the complete travel time equation of state

Akira Yoneda, Hartmut Spetzler

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The complete travel time equation of state (CT-EOS) enables us to obtain all the thermodynamic parameters from travel time or velocity measurements of elastic waves at simultaneously high pressure and temperature. Here we formulate the adiabatic CT-EOS and apply it to the lateral heterogeneity of seismic wave velocity in the lower mantle. We obtained internally consistent results for temperature, thermal expansivity and the Gruneisen constant in the lower mantle; at the depth (2741 km) just above the D″ layer, the most likely results are ∼ 2500 K for temperature, ∼ 1.0 × 10^-5 K^-1 for thermal expansivity and ∼ 1.0 for the Gruneisen constant. We also discuss the geophysical implication of the small thermal expansivity suggested in the deep lower mantle.

Original language	English
Pages (from-to)	369-377
Number of pages	9
Journal	Earth and Planetary Science Letters
Volume	126
Issue number	4
DOIs	https://doi.org/10.1016/0012-821X(94)90118-X
Publication status	Published - Sep 1994

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1016/0012-821X(94)90118-X

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title = "Temperature fluctuation and thermodynamic properties in Earth's lower mantle: An application of the complete travel time equation of state",

abstract = "The complete travel time equation of state (CT-EOS) enables us to obtain all the thermodynamic parameters from travel time or velocity measurements of elastic waves at simultaneously high pressure and temperature. Here we formulate the adiabatic CT-EOS and apply it to the lateral heterogeneity of seismic wave velocity in the lower mantle. We obtained internally consistent results for temperature, thermal expansivity and the Gruneisen constant in the lower mantle; at the depth (2741 km) just above the D″ layer, the most likely results are ∼ 2500 K for temperature, ∼ 1.0 × 10-5 K-1 for thermal expansivity and ∼ 1.0 for the Gruneisen constant. We also discuss the geophysical implication of the small thermal expansivity suggested in the deep lower mantle.",

author = "Akira Yoneda and Hartmut Spetzler",

year = "1994",

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T2 - An application of the complete travel time equation of state

AU - Yoneda, Akira

AU - Spetzler, Hartmut

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AB - The complete travel time equation of state (CT-EOS) enables us to obtain all the thermodynamic parameters from travel time or velocity measurements of elastic waves at simultaneously high pressure and temperature. Here we formulate the adiabatic CT-EOS and apply it to the lateral heterogeneity of seismic wave velocity in the lower mantle. We obtained internally consistent results for temperature, thermal expansivity and the Gruneisen constant in the lower mantle; at the depth (2741 km) just above the D″ layer, the most likely results are ∼ 2500 K for temperature, ∼ 1.0 × 10-5 K-1 for thermal expansivity and ∼ 1.0 for the Gruneisen constant. We also discuss the geophysical implication of the small thermal expansivity suggested in the deep lower mantle.

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