EOSC 114 Chapter Notes - Chapter 5: Downwelling, Upwelling, Subduction
27 Aug 2017
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Upwelling conduction current of the magma (in mantle) pushes the lithospheric plate. The plate boundaries reflect the subduction zones, zones of downwelling and upwelling. Hanging wall upper part of the fault. Footwall lower part of the fault e. g. rockies mountains large-scale reverse faulting system, called thrust faults expansion / lengthening the hanging wall slides down the footwall. Normal fault characterize what is caused by tension. Strike-slip fault: doesn"t have well defined footwall or hanging wall. The way that the magma is melting the plate creates new oceanic crust. Starts very thin and gradually grows thicker as a result of cooling of the plate. Rock is much weaker when exposed to tension than to compression (contributes to earthquakes tend to be smaller in mid-ocean ridges). Mega thrust: interface between two plates (poses the biggest hazard) The deepest earthquake is no deeper than ~650 km (too ductile).
