KEY WEST, Fla. -

A 5.1 magnitude earthquake centered off the northern coast of Cuba was reportedly felt in the Florida Keys.

The earthquake occurred at 3:57 p.m. about 110 miles southeast of Key West.

"It is unusual here. I've been here for 28 years and never felt an earthquake here in the Keys," said Monroe County Sheriff's Office spokeswoman Becky Herrin.

National Weather Service alerts said that there was no tsunami warning being issued for Key West.

According to Earthquake-Report.com, the tremor was felt by someone in Marathon who said they felt a "very light rumbling for approx. 10-15 seconds." Others reported mild swaying of buildings with one Key West resident adding, "I was sitting at my desk at work on the second floor and the building did a slight wave movement to the right. It was kind of freaky."

The Boca Raton Police Department even sent out a tweet about the earthquake, saying it may have been felt it in its area.

A 5.1 magnitude earthquake is considered moderate and can cause damage of varying severity to poorly constructed buildings.