The island is on red alert, which means an eruption is “imminent now,” NEMO said.
Evacuation orders are in place in a dozen districts of St. Vincent, affecting around 6,000 to 7,000 people, a spokesperson for the University of the West Indies Seismic Research Center, or UWI-SRC, told CNN.
Saint Vincent is the largest island in the Saint Vincent and the Grenadines chain of the Caribbean.
Scientists at the Belmont Observatory in Saint-Vincent observed a volcanic earthquake on the island around 3 a.m. local time, according to UWI-SRC.
The first band of tremors was followed by four more with the last at 1 p.m. This type of seismic signal is typically associated with movement of magma and fluids near the surface, according to the UWI-SRC.
Clouds of vapor could also be seen from the observatory during times of tremors.
Trinidad and Tobago Prime Minister Keith Rowley spoke to Gonsalves and offered his assistance, according to the Trinidad and Tobago Department of National Security.
Venezuela will send humanitarian supplies and risk experts, Venezuelan Foreign Minister Jorge Arreaza said on his Twitter account.