EVSC 2800 Study Guide - Final Guide: Subduction, Convergent Boundary, Seismic Wave
12 May 2016
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Document Summary
A fault is a fracture in earth"s crust where the rocks have moved on either side. Some faults have offsets of hundreds of miles, but some are much smaller. Extension of earth"s crust leads to normal faulting. A block of crust flanked by normal faults drops down and forms a rift valley at a divergent plate boundary. Within the basin and range province (western u. s. down into texas), earth"s lithosphere has been stretched up to 100%. This region was subjected to extension that thinned and cracked the crust as it pulled apart. {episodes of deposition, deformation, erosion, volcanism, and further structural deformation combined to yield the present landscape. } Roughly circular basins are sometimes the result of the weight of sediments accumulating in a shallow sea depressing the crust. A dome is likely due to an igneous intrusion at depth. Earthquakes happen when rock being deformed suddenly breaks along a fault.
