TY - JOUR
T1 - Probabilistic tomography maps chemical heterogeneities throughout the lower mantle
AU - Trampert, Jeannot
AU - Deschamps, Frédéric
AU - Resovsky, Joseph
AU - Yuen, Dave
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/10/29
Y1 - 2004/10/29
N2 - We obtained likelihoods in the lower mantle for long-wavelength models of bulk sound and shear wave speed, density, and boundary topography, compatible with gravity constraints, from normal mode splitting functions and surface wave data. Taking into account the large uncertainties in Earth's thermodynamic reference state and the published range of mineral physics data, we converted the tomographic likelihoods into probability density functions for temperature, perovskite, and iron variations. Temperature and composition can be separated, showing that chemical variations contribute to the overall buoyancy and are dominant in the lower 1000 kilometers of the mantle.
AB - We obtained likelihoods in the lower mantle for long-wavelength models of bulk sound and shear wave speed, density, and boundary topography, compatible with gravity constraints, from normal mode splitting functions and surface wave data. Taking into account the large uncertainties in Earth's thermodynamic reference state and the published range of mineral physics data, we converted the tomographic likelihoods into probability density functions for temperature, perovskite, and iron variations. Temperature and composition can be separated, showing that chemical variations contribute to the overall buoyancy and are dominant in the lower 1000 kilometers of the mantle.
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U2 - 10.1126/science.1101996
DO - 10.1126/science.1101996
M3 - Article
C2 - 15514153
AN - SCOPUS:7444248513
SN - 0036-8075
VL - 306
SP - 853
EP - 856
JO - Science
JF - Science
IS - 5697
ER -