The quake occurred at 4:53 p.m., and was centered 15 miles north northwest of Borrego Springs and 30 miles south of Palm Springs, according to the US Geological Survey. It was recorded at a depth of 7.3 miles.
The 5.4 quake was immediately followed by a 3.6-magnitude quake six miles northwest of Anza and 15 miles southwest of Palm Springs, with the survey reporting that dozens more smaller aftershocks followed, including five quakes measuring between 3.0 and 3.3.
Throughout the afternoon and early evening the US Geological Survey received thousands of shake reports from more than 500 zip codes around California, Nevada and Arizona, with reports also coming from Mexico.
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