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| USGS Warns San Andreas Swarm Could Put California at Risk of Big Earthquakes for Over a Week
An earthquake swarm on the San Andreas Fault may mean parts of California are at risk of a big earthquake for the next week. Swarms recorded over the last 20 years have lasted between one and 20 days, with an average of a week, the U.S. Geological Survey (USGS) said in a statement. The earthquake swarm hit on a southern section of the fault, beneath the Salton Sea. The largest quake recorded was a magnitude 4.6, which hit at 8.56 a.m. local time on August 10. This part of San Andreas is capable of producing earthquakes that are magnitude 7 and above. The USGS said the last time an earthquake of this size hit this section was over 300 years ago. "In a typical week, there is approximately a 1 in 10,000 chance of a magnitude 7+ earthquake on the southernmost San Andreas