IL SEMINARIO SARA' TRASMESSO IN TELECONFERENZA.
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The combination of the secular cooling of a heterogeneous and stratified mantle, and the astronomical tuning are inferred as the main controlling factors of plate tectonics. The Earth's rotation and the tidal despinning generate a torque acting on the lithosphere, producing a net westerly directed rotation of the lithosphere with respect to the underlying mantle. During the interseismic stage, a dilatational band forms in the brittle upper crust. The stretching is recovered during the coseismic stage when the fault hangingwall falls releasing its gravitational energy on a normal fault. On the contrary, for a thrust fault, during the interseismic stage an over compressed band forms above the brittle–ductile transition, which is opposingly dilated during the earthquake, delivering elastic energy.
Giovanni Gallavotti