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Constraining mantle viscosity using dynamic topography, the geoid, and seismic heterogeneity from high-resolution mantle circulation models

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Randomized trial tests mantle viscosity against dynamic topography, geoid, and seismic structure, suggesting improved modeling methods.

The aim is to evaluate the effect of mantle viscosity on dynamic topography, the geoid, and seismic heterogeneity using high-resolution mantle circulation models.
Systematic testing of lower mantle viscosity profiles against observations of dynamic topography and the geoid.
Used high-resolution mantle circulation models that consider tectonic histories and stress transmission.
Analyzed the fit of models to seismic heterogeneity and made refinements to the tectonic reconstruction.
Lowering viscosity in the upper lower mantle reduces overestimated dynamic topography amplitudes but decreases fit to the geoid and seismic heterogeneity.
Preferred viscosity profile provides an excellent fit to observed geoid amplitudes and S40RTS seismic heterogeneity.
Alternate tectonic reconstruction improved correlation with observed geoid by approximately 20%.

Brown et al. (2026) studied this question.

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