Physics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..369y&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 4, p. 369-377
Physics
3
Earth Mantle, Equations Of State, Free Convection, Seismic Waves, Thermodynamic Properties, Gruneisen Constant, Temperature Gradients, Thermal Expansion
Scientific paper
The complete travel time equation of state (CT-EOS) enables us to obtain all the thermodynamic parameters from travel or velocity measurements of elastic waves at simultaeously 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 (double prime) layer, the most likely results are approximately 2500 K for temperature, approximately 1.0 x 10(exp -5)/K for thermal expansivity and approximately 1.0 for the Gruneisen constant. We also discuss the geophysical implication of the small thermal expansivity suggested in the deep lower mantle.
Spetzler Hartmut
Yoneda Akira
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