19 - California It separates the Juan de Fuca and North...

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21:44 Coast of British Columbia –right lateral strike slip San Andreas Fault-Transform Fault, right lateral strike slip Between the spreading center of the north west and south west Juan de Fuca Plate—(subduction zone) Inside of the Pacific Plate Hazard-ground motion, what kind of earthquakes + people in the environment =  risk Major Western Cities at Seismic Risk: Los Angeles, CA—thrust, strike-slip faulting San Diego,  CA –strike-slip faulting San Francisco, CA—strike slip faulting Portland, OR –subduction zone earthquakes Seattle, WA—subduction eq’s, thrust faulting Vancouver, BC, CN –subduction zone earthquakes Reno, NV –normal faulting Salt Lake City, UT –normal faulting  Major cities at much lower seismic risk: Las Vegas, Phoenix, Tucson The Cascadia Subduction Zone
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Very long sloping fault that stretches from mid-Vancouver Island to Northern 
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Unformatted text preview: California. It separates the Juan de Fuca and North America plates. New ocean floor is being created offshore of Washington and Oregon. As more material wells up along the ocean ridge, the ocean floor is pushed toward and beneath the continent. The Cascadia Subduction Zone is where the two plates meet. Juan de Fuca Plate, under Columbia, OR, WA Relative to other plates, it is tiny Subduction mega thrusts—biggest earthquakes occur on these Oldest oceanic lithosphere – 2 million years The boundary between the Juan de Fuca and North American plates Linear mountain chains, but Mt. St Helens is a little to the left LAST KNOWN MEGATHRUST EARTHQUAKE – January 27, 1700 21:44 21:44...
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  • Fall '07
  • 12:30-01:50pm
  • Cascadia subduction zone, faulting San Diego, faulting San Francisco, faulting  Major cities, –normal faulting Salt

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19 - California It separates the Juan de Fuca and North...

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