The quake struck at 5:27 a.m. local time and was said to have not been felt by many of those driving to work in the pre-dawn hours.
But shaking did awaken residents and tourists alike. “I felt like the place was spinning and … thought I was going sick,” said Dennis Connell, a security supervisor at a local Barbados country club.
There were no reports of damage or injuries from the shaking, and the Caribbean Disaster Emergency Response Agency told islanders to “go about their business as usual.”
Three much weaker tremors rattled Barbados in December.
The Windward Islands were struck by a more powerful 7.4 magnitude quake in 2007 that caused severe damage to some buildings on Martinique.