La Soufrière, St. Vincent SCIENTIFIC UPDATE – 17/04/21 6:00PM
1. The swarm of long-period and hybrid earthquakes continued at La Soufrière.
2. The rate of occurrence of these earthquakes has remained near-constant since the last update. No episodes of tremor have been recorded in the last 12 hours.
3. The continuous GPS (Global Positioning System) network has shown a change in the horizontal and vertical movement since the initial deflation observed after the April 9 explosive episode.
4. The continuous GPS (Global Positioning System) network is used to track changes in ground shape on and around the volcano.
5. These changes may suggest magma is being added from deep within the sub-volcanic system, however, more investigation is needed to confirm this interpretation.
6. The volcano continues to erupt although explosive activity appears to have ended at this time.
7. Its current pattern of seismic activity may indicate growth of a lava dome, but this has not yet been confirmed.
8. Explosions with accompanying ashfall, of similar or larger magnitude, could restart in the future impacting St. Vincent and neighbouring islands.
9. The volcano is at alert level Red.
10. Visit for Global Ash Impact posters. These are the latest research-informed material for concise best practice information for critical infrastructure managers to effectively manage ash-producing volcanic eruptions.
11. Visit the International Volcanic Hazard Health Network for volcanic ash information and resources:
NEMO St. Vincent and the Grenadines
API – The Agency For Public Information: St. Vincent and the Grenadines
Department of Emergency Management
NEMO Saint Lucia
CDEMA – Caribbean Disaster Emergency Management Agency
Montserrat Volcano Observatory
May be an image of map and text that says 'CSA ASC USGS science changing world UWI SEISMIC La Soufrière, St Vincent and the Grenadines RADAR imagery reveals that the active crater is somewhat enlarged while the crater floor has accumulated tephra and rubble. There also appear to be two small vents prior to the 16 April morning eruptive event. 16 April 2021 0952 UTC RCM Previously-reported Previously- pyroclastic flowsand ongoing flows Sees REN Crater vent continues to evolve with on-going eruption ofCanada Government airport @'
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