John noted the tremor after 5 a.m. He later noticed that his spring driven mechanical clock had stopped at 5:28 a.m. He checked his email and found a notice from the National Earthquake Information Center U.S. Geological Survey stating that there had been an earthquake.
A resident of St. George, Barbados, said that he felt substantial tremors at the same time.
Here is a little map modified from Wiki Commons. The black dot is the approximate location of the epicenter.
The earthquake was originally reported as being off of Martinique, but here is the data:
Time: 18 Feb 2014, 5:27 a.m.
Location: 14.694N, 59.015W
Distances from land:
106 miles North North East of Bathsheba, Barbados
125 miles East of Le Francois, Matinique
Above: Bathsheba, Barbados