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By Shane Croucher and John Feng
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A magnitude 4.7 earthquake struck near the border between Utah and Wyoming on Thursday morning, shaking residents of Salt Lake City, the U.S. Geological Survey (USGS) said.
The epicenter was around 25 miles south of Evanston, Wyoming. It had a depth of 8.4 miles.
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At the time of writing, nearly 1,600 people had reported feeling the tremor. Salt Lake City has a population of more than 217,000.
The USGS had a green alert for the quake, meaning a low likelihood of shaking-related casualties or economic losses.
The area falls within the intermountain seismic belt. The largest historical earthquake in the area was a magnitude 6.6 temblor in Hansel Valley, north of the Great Salt Lake, in 1934, the USGS says.
Earthquakes of magnitude 5 or greater occur there once every 10 years on average, and magnitude 6 or larger once every half century.
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Illinois Earthquake Felt in Missouri
In the early hours of Tuesday morning, the USGS recorded a magnitude 3.5 earthquake in southern Illinois, a tremor felt in neighboring St. Louis, Missouri.
The epicenter was located around 2.5 miles east of Ohlman, Illinois, and the quake had a depth of around 5.5 miles, the USGS said. More than 1,000 people reported feeling the tremor to the USGS.
As well as St. Louis, both sides of the Illinois-Missouri border, the quake was felt strongly in Springfield, Decatur, Effingham, and Greenville.
"This large region borders the much more seismically active New Madrid seismic zone on the seismic zone's north and west," says the USGS.
"The Illinois basin-Ozark dome region covers parts of Indiana, Kentucky, Illinois, Missouri, and Arkansas and stretches from Indianapolis and St. Louis to Memphis.
"Moderately frequent earthquakes occur at irregular intervals throughout the region."
California Earthquake Sparks Emergency Alerts
A magnitude 4.9 earthquake had also struck Southern California on Monday evening, centered about 12 miles north-northeast of Indio, according to the USGS.
The quake occurred just before 6 p.m. local time and was felt across parts of the Coachella Valley and surrounding areas.
The temblor was felt widely across Southern California, prompting concern among millions of residents.
At least four aftershocks measuring magnitude 3 or higher had been recorded in the Indio area, with the largest reaching a 3.5 magnitude, USGS data showed.
The USGS initially reported the largest earthquake as 5.1 magnitude, then revised it down to 4.6 before settling on the final measurement of 4.9.
Millions across the region received emergency alerts on their phones seconds before the earthquake struck, according to Patch.
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