Lecture 6C

Lecture 6C - The unusual topography of Nevada, western...

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Unformatted text preview: The unusual topography of Nevada, western Utah, eastern California, and southeastern Oregon is the direct result of stretching the earth’s crust. topography reflects tectonics OV SJV SN a satellite view to the south Across Nevada of the “basins” and ranges of this province Sierra Nevada brittlely thinned crust ductilely thinned crust mantle Borah Peak EQ, Idaho Vancouver Seattle Portland extension earthquakes Salt Lake City ˘ Reno Pacific plate motion with respect to N Am Major western cities at seismic risk — thrust, strike-slip faulting — strike-slip faulting — strike-slip faulting — subduction zone earthquakes — subduction eq’s, thrust faulting, deep normal fltng • Vancouver, BC, CN — subduction zone earthquakes — normal faulting • Reno, NV • Salt Lake City, UT — normal faulting • • • • • Los Angeles, CA San Diego, CA San Francisco, CA Portland, OR Seattle, WA Major western cities at much lower seismic risk: Las Vegas, Phoenix, Tucson HILTON CREEK NORMAL FAULT, E. SIERRA NEVADA Salt Lake City SLC A DISASTER WAITING TO HAPPEN Salt Lake City Wasatch normal fault Salt Lake City WASATCH FAULT AND LITTLE COTTONWOOD CANYON THE WASATCH FAULT EXPOSED ? Salt Lake City’s seismic gap ? Hammond, W. C., and Thatcher, Wayne, 2004, JGR, 109, B08403 Pacific-North American transform margin influence ...
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This note was uploaded on 01/11/2010 for the course GEOL 240Lxg at USC.

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Lecture 6C - The unusual topography of Nevada, western...

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