Incredibly, two earthquakes hit one second and about 60 miles apart over the weekend, according to the US Geological Survey
The first quake, which was a magnitude 3.4, struck about 5 miles west-southwest of Tecate, in Baja California, at 38 seconds after 5:13 p.m. on Sunday. That's about 85 miles from downtown San Diego, and just a few miles from the U.S.-Mexico border. The quake's epicenter was in an unoccupied area, but nearly 14 miles down.
Then, almost immediately after, a quake shook the Mexican desert about 18 miles southwest of the town of Ocotillo, in California. This quake had a magnitude of 3.6 and was very shallow — just over half a mile down — and could possibly have been felt by residents of the Mexican city of Mexicali, to the east.
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The most recent earthquake felt in San Diego County before Sunday's pair of temblors was on March 31, 2023, when a 4.5 magnitude event shook up the area around Palomar Mountain during the afternoon.