Two swarms of earthquakes reaching up to 4.5 magnitude rattled the Salton Sea region of Southern California, the U.S. Geological Survey reports.
The first swarm began at 12:08 p.m. Saturday, April 29, in Heber near the U.S.-Mexico border, about 60 miles south of the Salton Sea, the USGS reported. It included nearly 50 tremors reaching up to 3.7-magnitude, felt by about 60 people.
The quakes continued overnight, with one hitting at 5:12 a.m. Sunday, April 30.
A second swarm began at 12:09 a.m. Sunday, April 30, near Niland on the southern shore of the Salton Sea, consisting of more than 25 tremors with one of the latest hitting at 5:28 a.m.
The largest, a 4.5-magnitude quake, was felt by about 30 people, according to the USGS. Other quakes in the swarm reached up to 4.1 magnitude.
A 3.2-magnitude quake hit near Ocotillo Wells 30 miles west of the Salton Sea at 10:55 p.m. Saturday, April 29, followed by smaller aftershocks, the USGS reported.
The Salton Sea is a shallow, landlocked body of highly saline water about 180 miles southeast of Los Angeles. It is about 45 miles long and 20 miles wide.
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