Results 221 to 230 of about 14,706 (253)
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Lithosphere–asthenosphere viscosity contrast and decoupling
Physics of the Earth and Planetary Interiors, 2011The coupling/decoupling between the lithosphere and asthenosphere has significant implications for understanding many important aspects of plate tectonics and geodynamics. To drive plate motion, man- tle convection requires coupling at the lithosphere–asthenosphere (LA) interface.
DOGLIONI, Carlo +3 more
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Is the asthenosphere electrically anisotropic?
Earth and Planetary Science Letters, 2000Abstract Two techniques for resolving the conductance of an electrically conductive asthenosphere are presented. The first technique combines observatory electromagnetic data in the period range of the daily variation and longer, which provides penetration depths of 400 km and deeper, with laboratory data of the conductivity of upper mantle materials.
Karsten Bahr, Al Duba
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Nature Physical Science, 1972
Solubility considerations lead to a model of the asthenosphere which contains a CO2-rich liquid phase. The model explains variations in the asthenosphere between ocean and shield areas.
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Solubility considerations lead to a model of the asthenosphere which contains a CO2-rich liquid phase. The model explains variations in the asthenosphere between ocean and shield areas.
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Melt squirt in the asthenosphere
Journal of Geophysical Research, 1975The interpretation of the seismic low-velocity zone as a region of partially molten rock is extended to explain the transient displacements following the 1946 Nankaido earthquake. Three partial melt models are considered to account for the observed time constant of 3–5 years: large-scale diffusion of melt through a porous matrix can decay over ...
Gerald Mavko, Amos Nur
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Geological Society of America Bulletin, 1946
From the geophysical and physical laboratories at Harvard University have recently come data bearing on the effect of rising temperature on the compressibility of liquids, glasses, and crystalline solids. These new data have compelled the author of the following article to revise an earth-model which, in 1942, he derived from some general assumptions ...
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From the geophysical and physical laboratories at Harvard University have recently come data bearing on the effect of rising temperature on the compressibility of liquids, glasses, and crystalline solids. These new data have compelled the author of the following article to revise an earth-model which, in 1942, he derived from some general assumptions ...
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A Global View of the Lithosphere-Asthenosphere Boundary
Science, 2009Seismic imaging reveals a global velocity anomaly at depths of 70 to 100 kilometers that may be from some melt or a strong fabric in Earth’s mantle.
Rychert, C.A., Shearer, P.M.
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Enriched Asthenosphere and Depleted Plumes
International Geology Review, 1996“Lithosphere” and “asthenosphere” are mechanical concepts; “depleted mantle” (DM), “enriched mantle” (EM), and “primitive mantle” (PM) are chemical concepts. Upper mantle, lower mantle, and D″ are seismological subdivisions. Geochemistry provides few constraints on the locations of mantle reservoirs, but it is generally assumed that the MORB reservoir (
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Lithosphere-Asthenosphere Interactions Below Rifts
1995Quantitative 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
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Electromagnetic excitation of asthenospheric conducting zones
Izvestiya, Physics of the Solid Earth, 2008The 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
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Lithospheric Deformation and Asthenospheric Pressure
1990We 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
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