Pattern Maker In India | Ahmedabad

Continental displacements of thousands of kilometres point to flow patterns in the mantle of similar dimensions. As creep depends exponentially on temperature and as it is known that the temperature of the crust increases rapidly with depth, we can in this context suppose the mantle to have a sharp transition between a rigid crust and a fluid mantle at 50 to 100 km depth. Pattern Maker in India, Pattern Maker in Ahmedabad .Recently the coefficients of the tesseral harmonics of the geopotential from satellite observations have been determined. These departures from hydrostatic equilibrium seem to be caused by flow in the mantle, for from these coefficients can be computed the tractions exerted by the flow on the crust, assuming Navier-Stokes's equations, and the resulting pattern accords well with the world-wide tectonic features. Rising flow is associated with the East Pacific Ocean Rise, the Mid-Atlantic Ridge and the Mid-Indian Ocean Rise. Pattern Maker in India, Pattern Maker in Ahmedabad.Descending currents coincide with the Andes, the Alps and the Japan trench. The strong fifth harmonic in the satellite gravity data suggests that a flow pattern of this degree is at present establishing itself. On the other hand, continental reconstructions prior to Wegenerian drift suggest the presence of a strong fourth harmonic in the flow pattern.

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