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. Faults may range in length from a few millimeters to thousands of kilometers. The Elsinore Fault Zone is a large right-lateral strike-slip geological fault structure in Southern California.
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* 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). Now you can find out the answer to these questions online through a user-friendly interface developed by the USGS.In a first of its kind study U.S. Geological Survey (USGS) and Duke University seismologists have used tiny "microearthquakes" along a section of California’s notorious San Andreas Fault to create unique images of the contorted geology scientists will face as they continue drilling deeper into the fault zone to construct a major earthquake "observatory.Sunday’s magnitude 7.9 earthquake in central Alaska created a scar across the landscape for more than 145 miles, according to surveys conducted the past two days by geologists from the U.S. Geological Survey and the Alaska Division of Geological and Geophysical Survey.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).