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Lecture 6A - ES 240 G Davis San Andreas fault The mountains...

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ES 240 9/15/09 G. Davis
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The mountains of western North America are called the Cordillera and they are the still evolving product of ~780 million years of construction. However, their appearance today is largely the result of earth movements during only the past 20 to 30 million years. Much of those movements continue today and are responsible for earthquakes throughout the Cordillera. Today’s 240 lecture emphasizes areas other than California and on Cordilleran tectonics quite different than those of our famous San Andreas fault. San Andreas fault
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San Andreas Map subduction zone transform fault subduction zone transform fault spreading ridges
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Paci fi c plate North American plate Cascadia subduction zone Paci fi c Northwest crustal contraction by folding and thrust faulting Basin and Range province crustal extension by normal faulting Paci fi c- North American transform plate tectonics
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Vancouver Portland Salt Lake City Reno earthquakes ˘ Paci fi c plate motion with respect to N Am extension Seattle
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