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<p><b>New page</b></p><div>[[File:San_Andreas_Fault_San_Mateo.jpg|thumb|San_Andreas_Fault_San_Mateo]] [[file:Eq-prob.jpg|right|thumb|Eq-prob]] [[file:Kluft-photo-Carrizo-Plain-Nov-2007-Img_0327.jpg|right|thumb|Kluft-photo-Carrizo-Plain-Nov-2007-Img_0327]] [[file:SUNSET_ROCKS_San_Andreas_Fault.jpg|thumb|SUNSET_ROCKS_San_Andreas_Fault]] [[file:Mormon_Rocks_at_the_San_Andreas_Fault,_California,_USA_as_viewed_from_a_FPV_drone.webm|thumb|Mormon_Rocks_at_the_San_Andreas_Fault,_California,_USA_as_viewed_from_a_FPV_drone.webm]] [[file:San_Andreas_Fault_Sequential_Diagrams.jpg|thumb|San_Andreas_Fault_Sequential_Diagrams]] [[file:NASA_Radar_3-D_View_of_San_Andreas_Fault.jpg|thumb|NASA_Radar_3-D_View_of_San_Andreas_Fault]] {{Short description|Major geological fault in California}}<br />
{{Use mdy dates|date=October 2023}}<br />
{{Infobox fault<br />
| name = San Andreas Fault<br />
| photo = <br />
| photo_caption = <br />
| map = <br />
| map_caption = <br />
| location = [[California]], [[United States]]<br />
| country = [[United States]]<br />
| region = [[California]]<br />
| cities = [[San Francisco]], [[Los Angeles]], [[San Diego]]<br />
| length = 1,200 km (750 mi)<br />
| displacement = 20–35 mm/yr (0.79–1.38 in/yr)<br />
| plate = [[Pacific Plate]], [[North American Plate]]<br />
| status = Active<br />
| type = [[Transform fault]]<br />
| age = 30 million years<br />
| orogeny = <br />
| segments = <br />
| coordinates = <br />
}}<br />
<br />
The '''San Andreas Fault''' is a major geological fault in [[California]], [[United States]]. It forms the boundary between the [[Pacific Plate]] and the [[North American Plate]]. The fault extends roughly 1,200 kilometers (750 miles) through California. It is known for producing significant [[earthquakes]] and is a key feature in the study of [[plate tectonics]].<br />
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==Geological Characteristics==<br />
The San Andreas Fault is a [[transform fault]], which means it is a type of fault where two tectonic plates slide past one another. The fault is divided into three main segments: the Northern, Central, and Southern segments. Each segment has different characteristics and earthquake potential.<br />
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===Northern Segment===<br />
The Northern segment runs from the town of [[Hollister, California|Hollister]] to the [[San Francisco Peninsula]]. This segment was responsible for the [[1906 San Francisco earthquake]], one of the most devastating earthquakes in U.S. history.<br />
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===Central Segment===<br />
The Central segment extends from Hollister to [[Parkfield, California|Parkfield]]. This segment is known for its "creeping" behavior, where the plates move slowly and steadily, reducing the likelihood of large earthquakes.<br />
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===Southern Segment===<br />
The Southern segment runs from Parkfield to the [[Salton Sea]]. This segment is considered the most likely to produce a major earthquake in the near future.<br />
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==Historical Earthquakes==<br />
The San Andreas Fault has been the source of several significant earthquakes:<br />
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* [[1857 Fort Tejon earthquake]]<br />
* [[1906 San Francisco earthquake]]<br />
* [[1989 Loma Prieta earthquake]]<br />
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==Seismic Activity==<br />
The fault is monitored by various organizations, including the [[United States Geological Survey]] (USGS). The fault's movement is measured using [[GPS]] and other geophysical instruments. Scientists study the fault to better understand earthquake risks and to develop early warning systems.<br />
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==Impact on California==<br />
The San Andreas Fault has a significant impact on the geography and infrastructure of California. It influences the state's [[landscape]], [[water resources]], and [[urban planning]]. The fault is a major consideration in the construction of buildings, bridges, and other structures to ensure they can withstand potential earthquakes.<br />
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==See Also==<br />
* [[Earthquake]]<br />
* [[Plate tectonics]]<br />
* [[Pacific Plate]]<br />
* [[North American Plate]]<br />
* [[1906 San Francisco earthquake]]<br />
* [[1989 Loma Prieta earthquake]]<br />
* [[United States Geological Survey]]<br />
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==References==<br />
{{Reflist}}<br />
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==External Links==<br />
{{Commons category|San Andreas Fault}}<br />
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[[Category:Geology of California]]<br />
[[Category:Seismic faults of California]]<br />
[[Category:Transform faults]]<br />
[[Category:Plate tectonics]]<br />
[[Category:Natural history of California]]<br />
[[Category:Geological hazards]]<br />
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