Select your county from the dropdown menu above, or click on your county on the California map to the left to learn more about California earthquake risk and faults near you.Select your county from the dropdown menu above to learn more about California earthquake risk and faults near you.Prepare yourself and your family by knowing what to do before, during, and after an earthquake.Chance of 1 or more M6.7 or greater earthquakes striking CAMost Californians live within 30 miles of an active faultChance of 1 or more M6.7 or greater earthquakes striking CA*Most Californians live within 30 miles of an active faultKnown faults in California (and scientists continue to discover new ones)Chance of 1 or more M6.7 or greater earthquakes striking CA*Most Californians live within 30 miles of an active faultKnown faults in California (and scientists continue to discover new ones)Likelihood of one or more M7.0+ Quakes striking Northern CA*Cascadia Subduction Zone & Mendocino Triple JunctionLikelihood of one or more M7.0+ Quakes striking Northern CA*Likelihood of one or more M7.0+ Quakes striking Northern CA*Likelihood of one or more M7.0+ Quakes striking Northern CA*Cleveland Hills and Sierra Nevada faults & San Joaquin fault zoneLikelihood of one or more M7.0+ Quakes striking Southern CA*Likelihood of one or more M7.0+ Quakes striking Southern CA*San Andreas and Garlock faults & San Joaquin fault zoneLikelihood of one or more M7.0+ Quakes striking Southern CA*Likelihood of one or more M7.0+ Quakes striking Southern CA*Likelihood of one or more M7.0+ Quakes striking Southern CA*Likelihood of one or more M7.0+ Quakes striking Southern CA*
Since its formation, the Great Valley has continued to be low in elevation. ; Dart, R. L.
Fault lines directly below LA have the potential to cause more damage than an earthquake on the San Andreas. Shaded relief image of the Santa Rosa area showing active faults (black lines) and the detailed rupture pattern of the Rodgers Creek Fault where it crosses central Santa Rosa (in red). A study by the U.S. Geological Survey indicates that a portion of the San Andreas fault near Tejon Pass could be overdue for a major earthquake. Starting about 20 million years...This region of the United States has been tectonically active since the supercontinent Pangea broke up roughly 200 million years ago, and in large part because it is close to the western boundary of the North American plate. The Elsinore Fault Zone is a large right-lateral strike-slip geological fault structure in Southern California. USGS seismic hazard maps, data and tools for California and other parts of the United States can be found in the...A fault is a fracture or zone of fractures between two blocks of rock. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Earthquakes occur about every hundred years on average, along this section of the fault, with the last major earthquake occurring in … Quaternary fault map of the Basin and Range and Rio Grande Rift provinces, Western United States; 1982; OFR; 82-579; Nakata, John K.; Wentworth, C. M.; Machette, Michael N. Choose the Interactive Fault Map, or download KML files and GIS shapefiles from the links on the page. Quaternary fault and fold database of the United States; 2003; OFR; 2003-417; Machette, Michael N.; Haller, Kathleen M.; Dart, R. L.; Rhea, S. B. 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 mapped traces represent the integration of the following three different types of data: (1) geomorphic expression, (2) creep (aseismic fault slip),and (3) trench exposures. The orange, bean-shaped area represents the dense, magnetic body of rock on the east side of the fault beneath Santa Rosa.

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