La Soufrière Volcano Continues to Erupt on Caribbean Island of St. Vincent

Ash from the eruption of La Soufrière volcano on the island of St. Vincent covers vehicles on the outskirts of Bridgetown, Barbados, on Sunday. (Chris Brandis/AP)

Conditions on the Caribbean island of St. Vincent have worsened as La Soufrière volcano continues to push ash and debris into the atmosphere. Dozens of individuals have been rescued from the northern part of the island after refusing to evacuate last week. Officials are warning anyone still in the red and orange zones to flee as the mountain presents a new danger to anyone still in the area.

In the areas around the volcano, there is evidence of pyroclastic flows — avalanches of superheated gas and debris traveling as fast as more than 120 miles per hour along the mountainside — the University of the West Indies Seismic Research Centre’s lead scientist, Richard Robertson, said in a Sunday news conference. These flows are the most dangerous trait of the volcano, he said, as opposed to a slow-moving river of lava.

As La Soufrière continues to explosively erupt, ash and debris are launched into the air. Sometimes there isn’t enough force behind the materials to continue upward and the ash plume collapses on itself and it shoots back down, Robertson said. These clouds of gas can reach scalding-hot temperatures and carry car-size boulders as the flows make their way through valleys along the mountain. Once the pyroclastic flows hit the coast, the seawater begins to boil and the clouds pick up speed, racing across the surface of the water and away from land until they run out of energy.

“These flows are really moving masses of destruction,” Robertson said. “They just destroy everything in its path. Even if you have the strongest house in the world, they will just bulldoze it off the ground.”

These flows can happen as the volcano goes through periods of explosive activity and venting. Every hour and a half to three hours, Robertson explained, La Soufrière rumbles and produces tremors as the mountain vents more ash. This activity can create pyroclastic flows anywhere on the volcano, threatening anyone who didn’t evacuate last week.

During the news conference, the prime minister of St. Vincent and the Grenadines, Ralph Gonsalves, said the coast guard has rescued dozens of people from the northern part of the island since the volcano started to erupt Friday morning. The areas closest to the volcano were ordered to be evacuated last week, but some people decided to stay, putting rescuers at risk.

“I’m pleading with persons: Please, it’s past the hour to get out,” Gonsalves said. “And we will still have to try and get you out.”

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SOURCE: NPR, Dustin Jones

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