The Seismic Research Unit of the University of the West Indies in Trinidad removed the orange alert at 10 a.m. yesterday after calm had returned to the volcano. A lower level, yellow alert, which applies to mariners to stay 1.5 kilometres away from the area is now in place.

Barbados, Grenada, Trinidad, and St Vincent had been on a heightened alert since 6:30 p.m. Tuesday, after increased activity by the underwater volcano. A major eruption could have triggered tsunamis (giant waves) which could have affected one or more of the neighbouring islands.