Results 231 to 240 of about 14,706 (253)
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Asthenosphere readjustment and the earthquake cycle
Journal of Geophysical Research: Solid Earth, 1978A simple two‐dimensional model of the earthquake cycle (preearthquake strain accumulation, coseismic strain release, and postseismic readjustment) has been constructed from the Nur‐Mavko solution for a screw dislocation in an elastic plate (lithosphere) overlying a viscoelastic substrate (asthenosphere).
J. C. Savage, W. H. Prescott
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Stress and viscosity in the asthenosphere
Tectonophysics, 1979Abstract Stresses and effective viscosities in the asthenosphere to a depth of 400 km are calculated on the basis of Weertmans “temperature method” i.e., on relating viscosity to the ratio of the temperature to the melting point (=homologous temperature).
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The lithosphere-asthenosphere system in Fennoscandia
Tectonophysics, 1982Abstract We present a summary of the available information on Rayleigh-wave dispersion data for the Fennoscandian region. The observations have been combined to produce regional dispersion relations which have then been subjected to the “hedgehog” inversion procedure. The results are presented on a map outlining the thickness of the lid and the shear
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Asthenospheric Source of Ugandan Ultrapotassic Magma?
The Journal of Geology, 1985The mafic ultrapotassic lavas of the Virunga igneous province of SW Uganda and adjacent regions are chemically much more similar to the unquestionably oceanic mafic magmas of Tristan da Cunha than has hitherto been recognized, which raises the possibility that both may arise from similar asthenospheric mantle sources.
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On the origin of the asthenosphere
Earth and Planetary Science Letters, 2012Abstract Various models of the origin of the asthenosphere are reviewed based on the latest observations on mineral physics of mechanical properties, melting relationships and the thermal models of the upper mantle. Partial melting likely occurs throughout the upper mantle except for the lithosphere.
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Lithosphere-asthenosphere boundary
Geology, 1976Thomas H. Jordan, William S. Fyfe
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Geodynamics of melting in the Asthenosphere
2016At geological time-scales, the mantle behaves as a high Rayleigh number fluid, i.e., thermal convection takes place and produces cells circulating at variable sizes and speeds. A lot of effort has been made to understand the upwelling part of these cells occurring underneath ridges and hotspots where they give birth to volcanoes.
Gaillard, Fabrice +5 more
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