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The location of the San Andreas Fault is shown on this map. Its trace is marked by red dots connected by
thin red straight lines. The positions were measured from professional geological maps, primarily those of
the United States Geological Survey, California Geological Survey, Dibblee maps and geological literature.
The red dots are generally on the trace or within about 100 ft of it (true ground distance). Owing to
wiggles in the fault line, portions of the thin red lines can be more than 100 ft from the
fault.
By presenting the San Andreas Fault map as interactive web-based imagery, anyone can
pinpoint the fault anywhere along its trace. And by using a thin red line, the underlying landscape
features are minimally obscured.
The idea for this map came from Geology.com's publisher Dr.
Hobart King and Dr. David K. Lynch, author of Field
Guide to the San Andreas Fault. Cartographer Bradley Cole created the map. We are pleased to thank
Google for permission to publish the map, and the geologists listed here who
created the geological maps upon which our measurements are based.
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