Living On The Deadly Fault

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Amplify’d from geology.about.com

All About the San Andreas Fault

The San Andreas fault is a crack in the Earth's crust in California, some 1100 kilometers long. Many earthquakes have occurred along it, including famous ones in 1857, 1906 and 1989. It is the boundary between the North American and Pacific lithospheric plates. Geologists divide it into several segments, each with distinct behavior. A research project has drilled a deep hole into the fault to study the rock there and listen for earthquake signals. This page gives information on all these topics.

de image from US Ge

Geology Guide image from US Geological Survey map

The San Andreas fault is the foremost of a large set of faults along the plate boundary between the Pacific plate on the west and the North American plate on the east. The west side moves north, causing earthquakes as it moves. Over millions of years, it has brought very different sets of rocks to face each other across the fault trace. The forces associated with the fault have pushed up mountains in some places and stretched apart large basins in others. The mountains include the Coast Ranges and the Transverse Ranges, both of which consist of many smaller ranges. The basins include the Coachella Valley, the Carrizo Plain, the San Francisco Bay, the Napa Valley and many others. The California geologic map will show you more about those. California Geologic Map Read more at geology.about.com

 

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