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Slab
About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.
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TL;DR: In this paper, the force on a rectangular current-carrying coil moving above and parallel to a conducting plate of arbitrary thickness is investigated, and expressions for the lift and drag forces on the coil as a function of speed are developed.
Abstract: The force on a rectangular current‐carrying coil moving above and parallel to a conducting plate of arbitrary thickness is investigated. Expressions are developed for the lift and drag forces on the coil as a function of speed. Numerical calculations are made for a very thick plate and for plates with thickness of the order of the skin depth. Thick‐plate results are compared with experimental measurements of lift and drag on a superconducting coil suspended above a rotating aluminum wheel.
107 citations
TL;DR: In the mantle wedge of subduction zones, electromagnetic profiles reveal high electrical-conductivity bodies as mentioned in this paper and water released by dehydration of the slab induces melting of the mantle under volcanic arcs that can explain the observed high conductivities.
107 citations
TL;DR: In this paper, an alternative vector derivation of the expression for the rates of plate creation and consumption is given, from which it can be seen that the rates are proportional to the scalar product of the edges of the geohedron and plate polyhedron corresponding to the same boundary.
Abstract: Summary. An alternative vector derivation of the expression for the rates of plate creation and consumption is given, from which it can be seen that the rates are proportional to the scalar product of the edges of the geohedron and plate polyhedron corresponding to the same boundary. The plate polyhedron is defined by the set of triple junction vectors. This is used, together with a recent determination of the angular velocity vectors and a number of auxiliary plate boundary vectors, to revise the rates of plate creation and consumption along sections of plate boundaries. All plates which have a substantial proportion of their boundary connected to a downgoing slab are found to be decreasing in area. The total rate of plate generation is used in estimates of the area of the ocean floor and the total heat loss from the oceans. The rate of consumption within a relatively small area around New Guinea implies a large mass flux away from this region. Knowledge of the rates of plate creation and consumption is used in a number of different areas: calculating the contribution of plate creation to the total heat loss of the Earth; calculating geochemical fluxes out of the mantle, such as for the rare gases and other volatiles, and return fluxes back into the mantle resulting from reactions between sea-water and the ocean crust during hydrothermal circulation; calculating the area of the ocean floor as a function of age. Mass fluxes related to the distribution of the rates of creation and destruction along the plate boundaries are important boundary conditions on the flow pattern in the mantle. Previous estimates of these rates (Deffeyes 1970; Chase 1972; Garfunkel 1975) have applied a simple expression derived for spreading ridges (Deffeyes 1970), using angular distances from the poles of rotation measured graphically on a globe. An alternative derivation of the expression for rates of plate creation and consumption, which is independent of assumptions about the nature of the boundary, is given below in terms of the framework used to describe plate motions by McKenzie & Parker (1967, 1974). This derivation emphasizes that the rates depend on two sets of vectors - one the instantaneous rotation vectors defining the relative plate motions, the other a set of triple junction and auxiliary vectors defining the plate boundaries.
107 citations
TL;DR: In this paper, the authors used P- and S-wave arrival time data with similar path coverage to reveal an oceanic lithospheric slab deflected in the mantle transition zone beneath the Izu Bonin region in good agreement with the results of earlier tomographic and other seismic studies.
107 citations
TL;DR: In this paper, a synthesis of the microearthquake seismicity, the depths of thrust events, the depth of S to P conversions, and deep reflection seismic studies leads to a coherent picture of the subducting slab.
107 citations