![]() Maps of recent earthquakes, ShakeMaps for larger earthquakes, email notification, and moreĮarthquake Shaking Potential Map of California (Dec. Southern California Earthquake Center, USGS, and CGS Use this website to discover the hazards that exist in your area and learn how to reduce YOUR risk!įault maps, historic earthquakes, how the ground is expected to shake, and much more The following links provide local and statewide earthquake hazard information:Ĭalifornia Governors Office of Emergency Services The underlying fact is that residents of the Central Valley South area are not immune to damaging earthquakes and, therefore, should take preventative measures to prevent injuries to themselves and loved ones, as well as to minimize damage to their homes, businesses, and communities. However, we do know that the shaking can be significantly damaging as indicated by the 1983 Coalinga earthquake and the Vacaville-Winters earthquake that struck in western Sacramento Valley in 1892. Included in this group is the Nunez Fault that in 1983 produced a strong (about M6.5) earthquake centered near Coalinga and causing significant damage.īecause we cannot yet define their actual geometries and continuity, it is impossible to calculate what ground motions are likely to be produced by ruptures along these faults. The probabilityis based on a 30-year period, beginning in 2014. These faults are generally not well defined because they are deeply buried by valley sediments. Known faults in California (and scientists continue to discover new ones) Select your county from the dropdown menu above to learn more about California earthquake risk and faults near you. ![]() Here, numerous faults make up what is referred to as the San Joaquin fault zone. However, few know that there are actually damaging earthquake-producing faults underlying the valley itself, particularly along its western margin. Long-time residents of the Central Valley (South) ShakeOut Area are undoubtedly familiar with the occasional “roll” of a distant earthquake centered somewhere along on the San Andreas Fault to the west. Good news: Preparing now will give you confidence that you and your family will stay safe where the earth shakes. Government assistance may not be available or not enough to replace your damaged belongings or repair your home. Fire and police departments will be dealing with the most serious situations and may be unable to respond quickly to issues in your community. These earthquakes will disrupt services like electricity, water and sewer, and may limit access in and out of the region. There are over 500 active faults in California, according to the California Earthquake Authority, Most residents live within 30 miles of an active fault. But an earthquake near you can be more damaging to your house than magnitude 8 farther away. The San Andreas fault will create the biggest earthquakes – as big as magnitude 8 – that will disrupt the whole region. The Central Valley is ringed by faults – the San Andreas fault, California’s largest, on the west, the Garlock fault to the south, and the faults of the Sierra Nevada to the east. Understanding the risks and preparing to survive and recover can help keep your family safe. Shaking can begin suddenly but have lasting impacts. While the San Andreas is the most commonly known fault in California, did you know another large fault is even closer to Riverside The San Jacinto Fault. But like all of California, the southern Central Valley is earthquake country. But the new findings are helping geologists better understand what forces can trigger rumbles under our feet.With stunning landscapes as its backdrop and agriculture at the core of its economy, those who live in the southern Central Valley know how timeless the area can be. “We’re not yet at the point where we could start applying this knowledge to the hazard forecast,” Johnson says. But the San Andreas Fault system to the west sees more quakes in late summer and early fall, when water levels have dropped and the land is rebounding. For instance, faults along the Sierra Nevada’s eastern edge have more tremors in late winter and early spring. So different faults exhibit more small earthquakes at different times of year. Some faults experience more significant stress increases when the land is compressed, others when the land rebounds, depending on the fault orientation. ![]() “It’s not like there’s an earthquake season,” Johnson says. Johnson/Berkeley Seismological Laboratory Faults east of the Sierra Nevada experience more small earthquakes after wet winter months.Ĭ. The San Andreas Fault system reaches peak stress after dry summer ends, making earthquake conditions most favorable around September (red indicates a strong increase in stress along a fault blue marks a strong decrease). Faults in California react to seasonal water-induced stress in different ways.
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