It's just a coincidence both are active at the same time, a volcanologist said.
Scientists are keeping a close watch on two volcanoes in the eastern Caribbean that have been quiet for decades.
Lava began oozing out of La Soufrière volcano in St. Vincent and the Grenadines on Dec. 29.
Scientists with the Seismic Research Center at the University of the West Indies said there was no explosive eruption. Instead, the magma reaching the surface is forming a growing dome in La Soufrière's crater. The volcano is also releasing gas and steam.
The alert level on the northern end of the island of St. Vincent, where La Soufrière sits, has been raised to orange, which means an eruption could occur with less than 24 hours' notice.
However, no evacuations have been ordered, according to the country's National Emergency Management Organization.