TY - JOUR
T1 - Temperature fluctuation and thermodynamic properties in Earth's lower mantle
T2 - An application of the complete travel time equation of state
AU - Yoneda, Akira
AU - Spetzler, Hartmut
N1 - Funding Information:
We thank Prof. O.L. Anderson at UCLA for helpful commentsa nd Dr. G. Chen at CIRES, Universityo f Colorado for critically readingt he manuscriptT.h is work was supportedb y the NSF throughg rantE AR-8916327a nda matchingg rant from the Universityo f Colorado. A.Y. received additional support from the Yamada Science Foundation and the SeismologicalS ociety of Japan while visiting CIRES, Universityo f Colorado.
PY - 1994/9
Y1 - 1994/9
N2 - 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.
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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U2 - 10.1016/0012-821X(94)90118-X
DO - 10.1016/0012-821X(94)90118-X
M3 - Article
AN - SCOPUS:0028558054
VL - 126
SP - 369
EP - 377
JO - Earth and Planetary Sciences Letters
JF - Earth and Planetary Sciences Letters
SN - 0012-821X
IS - 4
ER -