The San Andreas Fault runs along the coast of California from Humboldt County in the north down to Imperial County near the Mexico border. More than 4.5 million living in San Bernardino-Ontario and 10 million people in Los Angeles County are living near active or passive faults.įind out about your home’s earthquake risk with CEA’s earthquake fault map by county. This includes blind thrust faults, like the quake along the Raymond fault that destroyed homes in Northridge in 1994. In the metropolitan Los Angeles area, every type of fault is present. Los Angeles Earthquake Risk Map with Fault Lines Long after the life-threatening phase of a quake is over, you might suffer far greater long term economic disaster as you repair or rebuild your home, experience power outages, and the central business districts are shut down. Northridge at a 6.7 magnitude earthquake killed 58 people, injured more than 9,000 and caused more than $49 billion in economic loss. The Ridgecrest earthquakes followed a 25-year "quiet period" after Northridge.
The second quake with a magnitude 7.1 lasted 12 seconds and was felt by about 30 million people from Sacramento to San Diego. The Ridgecrest earthquakes that hit on July 4 and July 5, 2019 with a magnitude 6.4 and 7.1, respectively, were the most recent major earthquakes in Southern California. In this computer simulation constructed through a collaborative effort between the United States Geological Survey and the Southern California Earthquake Center, the magnitude 7.8 scenario earthquake ruptures 186 miles from Bombay Beach at the edge of the Salton Sea in the south to Lake Hughes northwest of Palmdale in the north. This portion of the San Andreas fault has been identified as the most likely source of a very large earthquake in California. It is possible that when the next Los Angeles earthquake strikes, 270,000 people could be displaced.Īccording to a USGS ShakeOut scenario, a major earthquake could cause: Effects & damage of a major Los Angeles earthquake Electricity in Southern California could be out for days.ĬoreLogic estimates with Southern San Andreas Fault rupture will cause 3.5 million homes to be at risk with $289 billion in reconstruction value.įollow this computer simulation " San Andreas Earthquake Scenario" to view a 186-mile rupture from Bombay Beach to Lake Hughes. The region has faults that run through areas with thousands of buildings and millions of people.Įarthquake damage would include destroyed freeways because Interstate 10 crosses the San Andreas in a dozen places fires from broken gas lines damage to the water supply and disruption to interstate high-voltage power lines through the Cajon Pass. Seismologist Lucy Jones says the outcome will be worse if it happens on faults in metropolitan areas, such as Hollywood. USGS has estimated that there is a Los Angeles earthquake probability of a 75% likelihood of one or more magnitude 7.5 or greater quakes striking in the next thirty years, as of 2014. No one can predict when a big earthquake will happen. But on average, a quake of magnitude 6.0 or larger is likely to hit somewhere in Southern California every few years. Many people in LA County feel shaking from earthquakes a couple times a year, most mild or moderate with little damage. Find out more about recent Southern California earthquakes. The Jmagnitude 7.1 earthquake that ruptured the earth in the Mojave Desert unleashed the power of 45 nuclear bombs. Multiple aftershocks followed, and on Friday, July 5th, another earthquake struck with a magnitude of 7.1. PST a magnitude 6.4 earthquake struck about 12 kilometers (10.5 miles) southwest of Searles Valley. The 2019 Ridgecrest earthquakes were California's biggest in more than 20 years. Los Angeles earthquakes also happen on quiet faults. There is 75% probability of one or more magnitude 7.0 or greater earthquakes striking Southern California, based on a 30-year period, beginning in 2014. It can cause powerful earthquakes-as big as magnitude 8. The Southern San Andreas fault is the longest fault in California, slicing through Los Angeles County along the north side of the San Gabriel Mountains. Ever since, the North American plate has ground against the Pacific plate at a boundary called a strike-slip fault. The San Andreas formed about 30 million years ago as the North American plate swallowed nearly all of the Farallon plate. When most of us on the West Coast think about Los Angeles earthquakes, we think of the Southern San Andreas fault.
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How to mitigate earthquake damage in LA.What faults are in the Los Angeles area?.Effects & damage of a major Los Angeles earthquake.What is the probability of a large earthquake striking Southern California?.
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