La Soufriere St. Vincent, SCIENTIFIC UPDATE 29.04.21 6:00 PM
1. Seismic activity at La Soufrière has remained low since the tremor associated with the explosion and ash venting on 22 April.
2. In the last 24 hours, only a few long-period, hybrid and volcano-tectonic earthquakes have been recorded and there was no further tremor.
3. The seismic stations recorded signals from multiple lahars during a 12-hour period starting at 9 pm on 28 April.
4. Lahars seem to have taken place in all the valleys that drain from La Soufrière and caused considerable erosion and damage.
5.Lahars are a fast-moving, dense mixture of rocks, ash and vegetation and water originating from a volcano.
6. Some of these were hot lahars which were visibly steaming, having passed through hot volcanic deposits.
7. So many trees were brought down by the lahars that floating logs are a hazard to small craft near shore.
8. The volcano continues to be in a state of unrest.
9. Explosions with accompanying ashfall, of similar or larger magnitude to those that have already occurred in this eruption, can take place with little or no warning.
10. Visit the International Volcanic Hazard Health Network for volcanic ash information and resources:
Caption: Extensive erosion on the coastline at wet Wallibou, St. Vincent due to lahars on 29.04.21
Footage: Richard Robertson, UWI-SRC
NEMO St. Vincent and the Grenadines
API – The Agency For Public Information: St. Vincent and the Grenadines
NEMO Saint Lucia
Department of Emergency Management
CDEMA – Caribbean Disaster Emergency Management Agency
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