UPDATE (12pm): According to National Emergency Management Organisation (NEMO), explosive eruptions are currently ongoing at La Soufrière. Based on past patterns this is likely to continue for a few hours with peak (largest plume) in minutes to an hour. Another large explosion occurred at La Soufrière Volcano in Saint Vincent and the Grenadines (SVG) at approximately 10:48pm last night (Tuesday 13th April 2021). Pyroclastic flows were observed heading down the Eastern side of La Soufrière. Pyroclastic flows (aka Pyroclastic Density Currents - PDCs) or surges are NOT lava flows, according to UWI Seismic Research Centre. They are moving mixtures of ash, rock fragments and produced by an gas eruption. They travel down valleys and cause total devastation. To commemorate its 42nd anniversary yesterday since the 1979 eruption, La Soufrière had another explosive episode, beginning at 6:30am. Get out if you can, Professor Richard Robertson told residents in the Red Zone to “get out of you can” this morning, in view of the pyroclastic flows which have been heading towards the East. “It's not a good way to go,” he warned. “Don't put others at risk. Now is the chance.” Meanwhile, SVG Prime Minister, Dr. Ralph Gonsalves, told people this morning who are still in La Soufriere's Red Zone, “For heaven's sake, leave. Do not risk anymore of your life and limb." The scene in SVG has been described as resembling a “battle zone” since the first eruption of La Soufrière Volcano on Friday (9th April 2021). La Soufrière Scientific Update 14/04/21 - 6am 1. Seismic activity at La Soufrière, Saint Vincent showed a similar pattern to yesterday. 2. Small long-period earthquakes continued to gradually increase in number after the explosive activity at 6:30am on 13th April 2021. 3. These continued until another episode of explosive activity started at 8:30pm on 13th April 2021. 4. This generated continuous seismic tremor which lasted for four (4) to five (5) hours. 5. After the tremor had died down, small, long-period earthquakes were again recorded, again slowly growing in numbers. 6. The explosions which occurred pulsed for >40 minutes and produced Pyroclastic Density Currents (PDCs) which appear to have gone down valleys that drain towards the Rabacca River on the East coast of the island. 7. PDCs are hot (200°C - 700°C), ground-hugging flows of ash and debris. 8. Lahars (mudflows) were reported in the Sandy Bay Area on 13th April 2021. 9. The Volcano continues to erupt explosively and has now begun to generate Pyroclastic Density Currents (PDCs). 10. Its current pattern of explosions appears to be episodic (stop-and-go). 11. Over the past twenty-four (24) hours, the time between each explosion has increased. 12. Explosions and accompanying ashfall, of similar or larger magnitude, are likely to continue to occur over the next few days impacting Saint Vincent and neighbouring islands such as Barbados, Grenada, Saint Lucia. 13. The Volcano is at alert level Red. 14. Visit the International Volcanic Hazard Health Network for volcanic ash information resources: www.ivhhn.org/information. La Soufrière Scientific Update 13/04/21 - 6pm 1. Seismic activity changed with the explosive activity at 6:30am on 13th April 2021. Prior to the explosion, long-period (LP) earthquakes had been increasing in number. 2. Categorized as a Vulcanian explosion, it was accompanied by larger seismic tremor which was followed by over three (3) hours of smaller continuous seismic tremor. 3. Vulcanian explosions are small to moderate explosive eruptions, lasting seconds to minutes. Ash columns can be up to 20 Km in height and Pyroclastic Density Currents (PDCs) can be generated. 4. The explosions pulsed for ~30 minutes and produced PDCs that reached the sea at the mouth of the Wallibou approximately 6 Km from the Volcano. 5. Once this tremor had died down, LP earthquakes were recorded, again slowly growing in numbers, but are significantly smaller than those prior to the 6:30am explosion. 6. Eyewitness account of this flow indicated that it had extended further into the sea when it reached the coastline. 7. Observations made this afternoon from the coastline indicate that PDCs resulting from this morning and have reached the sea in every valley extending from Larikai to Wallibou. 8. The Volcano continues to erupt explosively and has now begun to generate Pyroclastic Density Currents (PDCs). Explosions and accompanying ashfall, of similar or larger magnitude, are likely to continue to occur over the next few days. This is a developing story - refresh this page for updates.
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