Can we resolve 3D density heterogeneity in the lower mantle?

Details Can we resolve 3D density heterogeneity in the lower mantle? Can we resolve 3D density heterogeneity in the lower mantle?

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1107r&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 6, p. 1107-1110

Physics

35

Seismology: Core And Mantle, Seismology: Surface Waves And Free Oscillations, Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

We reexamine the possibility of resolving 3D density structure in the mantle, by performing test inversions using a dataset of well constrained degree 2 splitting coefficients. We show that degree 2 in Vs and Vp can be resolved, and confirm that dlnVs/dlnVp>2.5 at depths >2000km, indicating a chemical component to large scale heterogeneity. Models with ρ positively correlated with Vs in the deepest mantle fit the data at least as well as those in which density and velocities are anti-correlated. However, some rough bounds on dlnρ/dlnVs can be inferred. Models obtained from geodynamic considerations are acceptable, in contrast to models with large negative (< -0.3) or positive (>0.6)dlnρ/dlnVs throughout the lower mantle. The most robust feature is a marked increase in dlnρ/dlnVs at the top of the lower mantle reaching a maximum around 1500 km.

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