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San Andreas: San Andreas Fault
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The San Andreas Fault is the sliding boundary between the Pacific Plate and the North American Plate. It slices California in two from Cape Mendocino to the Mexican border. San Diego, Los Angeles and Big Sur are on the Pacific Plate. San Francisco, Sacramento and the Sierra Nevada are on the North American Plate. And despite San Francisco’s legendary 1906 earthquake, the San Andreas Fault does not go through the city. But communities like Desert Hot Springs, San Bernardino, Wrightwood, Palmdale, Gorman, Frazier Park, Daly City.
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The San Andreas Fault is a geological fault that runs a length of roughly 800 miles (1,300 km) through western and southern California in the United States. The fault, a right-lateral strike-slip fault, marks a transform (or sliding) boundary between the Pacific Plate and the North American Plate.
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Many features of the San Andreas Fault are visible along Elizabeth Lake Road (County Road N2). Fault Slice Ridges are visible on the north side of the road between Bouquet Canyon Road and Johnson Pass Road. More evidence of the fault is the narrow, linear valley that the highway goes through. Sag ponds ... exist here. Elizabeth Lake, Munz Lakes, and Lake Hughes are sag ponds. Some of them may have been enlarged by man but look much the same.
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The central segment of the San Andreas fault runs in a northwestern direction from Parkfield to Hollister. While the southern section of the fault and the parts through Parkfield experience earthquakes, the rest of the central section of the fault exhibits a phenomenon called aseismic creep. This term describes the fault being able to move without causing earthquakes.
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The Pacific Plate (on the west side of the San Andreas fault) encompasses virtually the entire Pacific Ocean. The North American Plate (on the east side of the San Andreas fault) encompasses all of North America and Greenland. No wonder a bit of pressure builds up where the two come together.
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This satellite view shows the approximate trace of the San Andreas Fault across California. A fault trace is a line on a map where the fault is believed to intersect Earth's surface. Use the buttons in the upper left corner of the map window to zoom in and out and follow the fault across California. You can switch between map, satellite, and hybrid views by clicking the buttons in the upper right corner of the map window. Details about this map, how it was made and how accurate it might be are given below.
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San Andreas Fault