Pictured Above: Eruption at La Soufrière on Sunday (18th April 2021). There have been at least thirty (30) identifiable eruptions since 9th April 2021. Photo Credit: Thomas Christopher, UWI-SRC/MVO. According to the National Emergency Management Organisation (NEMO) in Saint Vincent and the Grenadines (SVG), La Soufrière Volcano continued to erupt up to last night (Sunday 18th April 2021). NEMO noted its pattern of seismic activity over the last few days is typical of the growth and destruction of lava domes. “Explosions with accompanying ashfall, of similar or larger magnitude, can occur with little or no warning.” There was another explosive eruption at La Soufrière at approximately 4:49pm yesterday afternoon. The resulting eruption plume rose to above 8 Km and drifted to the South and Southwest of the island. The Alert Level remains at RED. The UWI Seismic Research Centre said that there have been at least thirty (30) identifiable eruptions at La Soufrière since the first one on 9th April 2021. La Soufrière Scientific Update 19/04/21 - 6am 1. The episode of continuous seismic tremor generated by explosive activity at La Soufrière, lasted until about 9pm on 18th April 2021. 2. Following this, small long-period and hybrid earthquakes started to be recorded again, at a rate similar to before the explosive activity. This rate dropped significantly at about 1am on 19th April 2021. 3. No volcano-tectonic earthquakes were recorded in the last twelve (12) hours. 4. One (1) rockfall was recorded at 1:39am. Rockfalls can be generated by a growing lava dome, but this cannot be confirmed without visual observations. 5. The continuous GPS (Global Positioning System) network has shown a change in horizontal and vertical movement since the initial depressurization noted immediately following the 9th April 2021 explosive phase. 6. The continuous GPS network is used to track changes in ground shape on and around the Volcano. As magma moves beneath the Volcano, changes in pressure cause the Volcano to change shape (inflate/deflate). 7. These changes may suggest magma influx from deep within the sub-volcanic system, however, more investigation is needed to confirm this interpretation. 8. The Volcano continues to erupt. Its pattern of seismic activity over the last few days is typical of the growth and destruction of lava domes. 9. Explosions with accompanying ashfall, of similar or larger magnitude, can occur with little or no warning, impacting Saint Vincent and neighbouring islands. 10. The Volcano is at Alert Level RED. La Soufrière Scientific Update 18/04/21 - 6pm 1. The swarm of long-period and hybrid earthquakes continued at La Soufrière with no significant change in their rate of occurrence. 2. Occasional small Volcano-tectonic earthquakes were still being recorded. 3. An explosion generated a period of high-level tremor starting at 4:49pm on 18th April 2021. 4. The resulting eruption plume rose to above 8 Km and drifted to the South and Southwest of the island. 5. Measurements of Sulphur Dioxide flux (mass) at La Soufrière Volcano were again undertaken along the West coast yesterday and today. 6. An average SO2 flux of 232 and 391 Tons per day on 17th and 18th April 2021 respectively, was recorded. 7. The Volcano continues to erupt. Its pattern of seismic activity over the last few days is typical of the growth and destruction of lava domes. 8. Explosions with accompanying ashfall, of similar or larger size, can occur with little or no warning, impacting Saint Vincent and neighbouring islands. 9. The Volcano is at Alert Level RED. This is a developing story - refresh this page for updates.
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