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Download Rock Faulting 10/12/09
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Put your Worksheet on the box 7-4c pgs. 183-184 IN: List and describe the 3 types of rock folding. http://ees.as.uky.edu/sites/default/files/elearning/module10swf.swf Fault – a break in the Earth’s crust along which blocks of the crust slide relative to one another due to tectonic forces. NAMING FAULTS When the ground breaks, sections are moving with respect to each other. The ground above the fault = Hanging Wall. The ground below the fault = Footwall. Normal Faults Reverse Faults Strike-Slip Faults Tensional (pulling) stress Allows the hanging wall to slide down Compressional (pushing) Stress Causes the hanging wall to move up Stress Shearing (sliding) stress causes one block to slide past the other horizontally. Two types – right and left lateral Stress is still compressional (pushing), but the fault lies at a low angle. Now the hanging wall gets pushed up and over the footwall http://www.iris.edu/gifs/animations/faults.h tm Elasticity of the rock material Ductile material – limestones and clays Brittle material – sandstones and granites Amount of stress Speed that the stress is applied OUT: If a fault occurs in an area where rock layers have been folded, which type of fault is it likely to be? Why?
