![]() ![]() San Francisco, Sacramento and the Sierra Nevada are on the North American Plate. San Diego, Los Angeles and Big Sur are on the Pacific Plate. It slices California in two from Cape Mendocino to the Mexican border. The San Andreas Fault is the sliding boundary between the Pacific Plate and the North American Plate. Map copyright by David Lynch ( click to enlarge). The arrows show the directions of relative motion along the fault. Areas to the west (left) of the fault are part of the Pacific tectonic plate. Areas to the east (right) of the fault are on the North American tectonic plate. If a developer wants to build a subdivision, say, they are usually required to build about 50 feet (15 meters) away from the fault to reduce their earthquake risk, Bryant said.īut just because structures are set back from a fault, they can still be damaged when the ground shakes or by landslides, Bryant said.San Andreas Map: The red line on this map follows the surface trace of the San Andreas Fault across California. This will help with the geological investigations that are required to obtain a building permit, Bryant said. By clicking the highlighted area, users can download an official PDF of the map. Just like searching for directions, someone can search an address and if it's in a fault zone it will be highlighted. "What really was a big help was the Google map," Bryant told OurAmazingPlanet. After 30 years as a geologist, reading a map has become second nature to him, Bryant said, but to someone looking at these maps for the first time they can seem like bunch of squiggly lines. "The ability to read a map varies greatly," Bryant said. ![]() These major faults in California could affect 36 counties and 104 cities, so geologists have tried to make the site as user-friendly as possible. The maps include the San Andreas, San Jacinto, Calaveras and Hayward faults.Ī fault is a fracture or group of closely associated fractures in the crust of the Earth along which rocks on one side have moved relative to those on the other side. ![]()
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