Results 211 to 220 of about 21,832 (251)

Lithosphere-Asthenosphere Interactions Below Rifts

1995
Quantitative model results of flow within a viscous lower lithosphere and asthenosphere are presented, which result from the thermal and mechanical consequences of extension within the solid upper lithosphere. The flow is calculated using a two-dimensional, time-dependent formulation of the Navier -Stokes equations for an incompressible viscous fluid ...
C. E. Keen, R. R. Boutilier
openaire   +1 more source

Electromagnetic excitation of asthenospheric conducting zones

Izvestiya, Physics of the Solid Earth, 2008
The relations between galvanic and inductive electromagnetic excitation of 3-D asthenospheric conducting zones are considered. Mathematical modeling with the application of integral equations shows that the rather intense magnetotelluric anomalies reflecting the topography of the conducting asthenosphere arise via the galvanic channel, which has two ...
M. N. Berdichevsky, R. F. Logunovich
openaire   +1 more source

Lithospheric Deformation and Asthenospheric Pressure

1990
We present here a model of lithospheric deformation caused by a radial pressure acting at the base of the lithosphere. Such a pressure may arise, for instance, as a result of convective motions occurring in the Earth’s mande. As a first approximation, we consider a rather simple Earth model consisting of a fluid interior, the mantle or asthenosphere ...
Martine Amalvict, Hilaire Legros
openaire   +1 more source

Asthenosphere readjustment and the earthquake cycle

Journal of Geophysical Research: Solid Earth, 1978
A 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
openaire   +1 more source

Electrical conductivity of the lithosphere-asthenosphere system

, 2021
S. Naif, K. Selway, B. Murphy, G. Egbert, A. Pommier   +4 more
semanticscholar   +1 more source

Stress and viscosity in the asthenosphere

Tectonophysics, 1979
Abstract 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).
openaire   +1 more source

The lithosphere-asthenosphere system in Fennoscandia

Tectonophysics, 1982
Abstract 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
openaire   +1 more source

Asthenospheric Source of Ugandan Ultrapotassic Magma?

The Journal of Geology, 1985
The 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.
openaire   +1 more source

On the origin of the asthenosphere

Earth and Planetary Science Letters, 2012
Abstract 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.
openaire   +1 more source

Lithosphere-asthenosphere boundary

Geology, 1976
Thomas H. Jordan, William S. Fyfe
openaire   +1 more source