Results 201 to 210 of about 19,495 (236)
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The Earth's Mantle: Evidence of Non-Newtonian Flow
Science, 1973Recent information from experimentally deformed dunite coupled with a reanalysis of data on the Fennoscandian postglacial rebound suggest that the rheological behavior of the upper mantle is distinctly non-Newtonian, and that the shear strain rate is proportional to the shear stress raised to about the third power.
R L, Post, D T, Griggs
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Visualizing Strain Anisotropy in Mantle Flow Fields
Computer Graphics Forum, 2011AbstractThe evolution of strain and development of material anisotropy in models of the Earth’s mantle flow convey important information about how to interpret the geometric relationship between observation of seismic anisotropy and the actual mantle flow field.
Harald Obermaier +4 more
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Visualization of Flow Behavior in Earth Mantle Convection
IEEE Transactions on Visualization and Computer Graphics, 2012A fundamental characteristic of fluid flow is that it causes mixing: introduce a dye into a flow, and it will disperse. Mixing can be used as a method to visualize and characterize flow. Because mixing is a process that occurs over time, it is a 4D problem that presents a challenge for computation, visualization, and analysis.
Simon Schröder +5 more
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A Complex Pattern of Mantle Flow in the Lau Backarc
Science, 2001Shear-wave splitting analysis of local events recorded on land and on the ocean floor in the Tonga arc and Lau backarc indicate a complex pattern of azimuthal anisotropy that cannot be explained by mantle flow coupled to the downgoing plate. These observations suggest that the direction of mantle flow rotates from convergence-parallel in the Fiji ...
G P, Smith +5 more
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Seismic Determination of Elastic Anisotropy and Mantle Flow
Science, 1993When deformed, many rocks develop anisotropic elastic properties. On many seismic records, a long-period (100 to 250 seconds), "quasi-Love" wave with elliptical polarization arrives slightly after the Love wave but before the Rayleigh wave. Mantle anisotropy is sufficient to explain these observations qualitatively as long as the "fast" axis of ...
J, Park, Y, Yu
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What the mantle sees: The Effects of continents on mantle heat flow
2000The effects of continents on mantle heat flow are explored through a synthesis of heat flow data analysis and theoretical modeling. The data employed are from the Canadian Shield and the Canadian Appalachians and consist of both surface heat flow measurements and measurements of crustal heat production. The combined data sets, together with gravity and
A. Lenardic +5 more
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Seismic anisotropy and mantle flow
Journal of Geophysical Research: Solid Earth, 1989Seismic anisotropy in the mantle is primarily due to deformation‐induced lattice preferred orientation (LPO) of olivine crystals. The aim of this paper is to better understand how such LPO is produced by flow, and to learn whether observations of seismic anisotropy can be used to infer the local direction of flow within the mantle.
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Chaotic topography, mantle flow and mantle migration in the Australian–Antarctic discordance
Nature, 1998Oceanic crust formed over the past 30 million years at the Australian–Antarctic discordance (AAD) is characterized by chaotic sea-floor topography, reflecting a weak magma supply from an unusually cold underlying mantle. During the past 3–4 million years, however, a source of increased magma supply, coinciding with the known Indian–Pacific mantle ...
David M. Christie +3 more
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Isotopic portrayal of the Earth’s upper mantle flow field
Nature, 2007It is now well established that oceanic plates sink into the lower mantle at subduction zones, but the reverse process of replacing lost upper-mantle material is not well constrained. Even whether the return flow is strongly localized as narrow upwellings or more broadly distributed remains uncertain.
Meyzen, Christine +5 more
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Upper mantle flow in the western Mediterranean
Earth and Planetary Science Letters, 2007Two cross-sections of the western Mediterranean Neogene-to-present back-arc basin are presented, in which geological and geophysical data of the TRANSMED Project are tied to a new shear-wave tomography. Major results are i) the presence of a well stratified upper mantle beneath the older African continent, with a marked low-velocity layer between 130 ...
Giuliano F. Panza +3 more
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