A swarm of earthquakes, including one with a preliminary magnitude of 4.3, shook the Inland San Bernardino County on Thursday morning.
According to the U.S. Geological Survey, the quake struck at 9:32 a.m. The epicenter was roughly 4 miles northwest of Rialto, at a depth of about 3 miles.
The temblor followed a pair of smaller earthquakes earlier in the morning. A 3.0 was registered at 8:34 a.m. and a 2.8 magnitude quake hit about 10 minutes later.
The USGS also detected a series of four smaller quakes, including a 3.1, that were recorded in the first hour following the larger earthquake.
“Yes Southern California, that was an earthquake you just felt. Today’s reminder that California is earthquake country,” USGS Earthquakes posted on X.
The shaking was felt as far as Ridgecrest to the north, San Diego to the south, Oxnard to the west and Twentynine Palms to the east.
There were no immediate reports of damage or injuries.
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Thousands of earthquakes are recorded in California each year, but the vast majority are extremely minor. Several hundred reach a magnitude of 3.0, and only about 15 to 20 reach a magnitude of 4.0 or greater, according to the USGS.
In North America, only Alaska records more quakes per year than California.
What to do in an earthquake
During an earthquake, knowing the proper steps to protect yourself and minimize injury is crucial. The California Department of Public Health (CDPH) provides detailed guidelines on what to do during such events. Here are the key points:
Drop: Immediately drop down onto your hands and knees. This position prevents you from being knocked over and allows you to stay low and crawl to safety if necessary.
Cover: Use one arm to protect your head and neck, and if possible, take shelter under a sturdy table or desk. If no shelter is available, get down next to an interior wall away from windows. Stay on your knees and bend over to protect vital organs.
Hold On: Hold on to your shelter until the shaking stops. Be prepared to move with your shelter if it shifts.
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