Maritime communities across the Alabama and Florida Gulf coasts reported no tremors Monday after a strong magnitude 6.1 earthquake struck in the Gulf just northwest of Cuba.

The rare Gulf quake hit over 250 miles from the nearest active plate boundary. Scientists said it occurred within the North American Plate, making it an “intraplate” earthquake, a less common type that happens inside of a tectonic plate instead of along its edges.

The earthquake, which occurred at around 1 p.m. CDT, was one of the strongest recorded in the Gulf over the last 100 years. While the event established a new record for seismic magnitude within the Gulf, the National Tsunami Warning Center confirmed there is no tsunami threat to the United States.

The quake is the largest recorded in the Gulf since 1950 and only the sixth event of magnitude 5.0 or greater documented there in the past 75 years, according to records from the U.S. Geological Survey.

Out of 11 local boat and charter captains GCM reached out to along the shores of the Alabama coast, Pensacola and Key West, none of the mariners felt shaking or observed any unusual water activity. This lack of local impact was echoed by the National Weather Service in Mobile, which reported receiving no calls regarding the earthquake as of Monday afternoon.

While the energy did not reach the northern Gulf, residents in other parts of the Sunshine State and Mexico described light shaking and tremors.

Jochen Braunmiller, a seismologist at the University of South Florida, said that while earthquakes occur often along fault lines in places like California, they are relatively rare in the Gulf because the region is located inside a tectonic plate, according to a report in The New York Times. Experts warned that subsequent aftershocks are possible in the coming days as the fault makes minor adjustments.

There is a 97% chance of at least one magnitude 3 or greater aftershock over the next week. The possibility of at least one magnitude 4 or greater aftershock is 58%, while the possibility of at least one magnitude 5 or greater aftershock is 11%, according to the latest updates from the USGS aftershock forecast.