A geodynamic and mineral physics model of a solid-state ultralow-velocity zone

Details A geodynamic and mineral physics model of a solid-state ultralow-velocity zone A geodynamic and mineral physics model of a solid-state ultralow-velocity zone

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.303..193b&link_type=abstract

Earth and Planetary Science Letters, Volume 303, Issue 3-4, p. 193-202.

Computer Science

1

Scientific paper

Recent results (Wicks et al., 2010) suggest that a mixture of iron-enriched (Mg,Fe)O and ambient mantle is consistent with wavespeed reductions and density increases inferred for ultralow-velocity zones (ULVZs). We explore this hypothesis by simulating convection to deduce the stability and morphology of such chemically-distinct structures. The buoyancy number, or chemical density anomaly, largely dictates ULVZ shape, and the prescribed initial thickness (proxy for volume) of the chemically-distinct layer controls its size. We synthesize our dynamic results with a Voigt-Reuss-Hill mixing model to provide insight into the inherent seismic tradeoff between ULVZ thickness and wavespeed reduction. Seismic data are compatible with a solid-state origin for ULVZs, and a suite of these structures may scatter seismic energy to produce broadband PKP precursors.

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