Consequences of experimental transient rheology

Roberto Sabadini, Brad K. Smith, David A. Yuen

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Recent analyses of transient creep data for lower crustal and upper mantle substances show that the parameters of the Burgers’ body rheological model, used up to now by geodynamicists, have much lower ratios of the short‐term to long‐term viscosities than the laboratory values. We have used these data to constrain the viscosity contrast across the 670 km discontinuity. Our results show that the previously inferred viscosity variations are now reduced by about a factor of ten in the new transient models. This finding is in agreement with the revised viscosity estimate based on long‐wavelength geoid anomalies and seismic tomography. We find that time‐dependent perturbations to the gravity field from recent ice movements are not at all small.

Original languageEnglish (US)
Pages (from-to)816-819
Number of pages4
JournalGeophysical Research Letters
Volume14
Issue number8
DOIs
StatePublished - Aug 1987

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