There were no immediate reports of casualties from the eruption that occurred four days short of the 42nd anniversary of the last sizable eruption.
In the coastal town of Barrouallie, about 14 kilometers (9 miles) from the volcano, evacuees trudged toward shelters carrying backpacks, duffel bags and shopping bags stuffed with personal belongings after the explosion. Some prepared to stay there, while others were expected to board cruise ships or go to nearby islands that have offered help.
Others still waited for transportation to a shelter, including one family who stood for at least an hour by the side of a road under the sun with their children and suitcases as they awaited a ride from someone.