EARTHSC 1G03 Study Guide - Midterm Guide: Continental Drift, Convergent Boundary, Oceanic Crust
4 May 2016
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Document Summary
Direction of earth quakes are consistent with slabs and how deep they are. Epicenters of 99% of earth quakes confined to seismic belts. At mor quake are shallow = tensile stress. 2 continents colliding you go back to shallow earthquakes. Transform boundaries quakes are shallow = shear stress. Liquefaction- transformation of saturated sediment or soil to liquid when ground shaking causes particles to lose contact. Before earthquake, water saturated soil = there is pore space, near surface filled with air, rainy days its rain, but usually a mix. When earth happens the sediments shake and it loses contact with each other and water moves around, and behaves like liquid. Liquefaction of soil in niigata, japan caused earthquake-resistant buildings to fall over. (when something that seems solid acts liquid when earthquake happens). Uniformitarianism: present is the key to the past. Evidence of continental drift: wegner"s theory.
