Screenshot, USGS
A screenshot of where the first earthquake struck.

BLUFFDALE — Two small earthquakes shook residents in the south end of Salt Lake County early Friday.

But while many got a rude awakening out of bed, little damage was reported.

The quakes were centered about a mile south of Bluffdale. The first happened at 5:02 a.m. and was a magnitude 3.2 on the Richter scale, according to the University of Utah seismograph stations, which called that one the "foreshock." The second - the main shock - happened seven minutes later and had a magnitude of 3.7.

U. seismologists described it as an "earthquake sequence," but also noted that the probability of getting another one in that area stronger than 3.7 was small.

Many residents in Bluffdale and southwest portions of the valley reported feeling the shake.

"Just a big tremble. I knew what it was just because I’ve been through them before. My heart sank. I tried to calm myself and turn on the TV,” said Aubrey Cruz.

"I literally thought we were in the middle of a thunderstorm” was what went through Justin Scott's mind when he first heard the shaking.

Some residents reported shelves being knocked down and storage items being tossed around. But no major damage was reported.

U.S. Geological Survey geophysicist Robert Sanders said the rattling was widely felt by residents in the southwest portion of the valley down to the southern portion of Utah Lake.

Erin Worland felt it in Herriman.

"It was pretty loud. I actually experienced the one in St. George in ’92. And it was 5.8, I believe. I was 13 years old. And this was nothing compared to that,” she said.

The earthquakes were "typical shallow quakes," meaning they were felt with more intensity in a smaller area, Sanders said. The epicenters were about 8 miles deep and very close to each other.

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The Utah Department of Public Safety said the tremors are a good reminder that the Great Utah ShakeOut — a day Utah focuses on earthquake safety preparedness — is April 18.

Cruz said she thought about "the big one" during Friday's smaller earthquakes.

"I think we’ve heard it so often that we’re almost numb to it. And so that was definitely, definitely my first thought is I’ve got to get something pulled together that we are ready if something big happens,” she said.

Contributing: Felicia Martinez, Ladd Egan