GEOL 106 Lecture Notes - Mass, San Andreas Fault

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Scenario: the government of ontario proposes to build a nuclear reactor on the shore of lake ontario near kingston, our task: carry out a risk analysis and risk management study, for the government , focused on seismic risk. Elastic rebound theory: rigid part of earth can store elastic energy, (hockey stick) applying stress then eventually breaking or returning to original shape, original position, buildup of strain, slippage, strain released. Therefore earthquakes are associated with faults: earthquakes happen when either, a fault forms, there is an episode of movement on a pre-existing fault. In both cases, stored energy is released! For a big earthquake fault motion needs to be only a metre or so. Strike-slip : horizontal motion, not up and down , only side to side (stress is horizontal , flat: 2. Dip-slip : generates a fault scarp: the san andreas fault, two types. A) normal dip slip : down a ramp think of a ramp (stress is pulled out)

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