La destruction des dômes de 1979 et le nouveau est confirmée de même que les coulées pyroclastiques
UWI Seismic Research Centre
StaSp2oonssore dh ·
La Soufriere SCIENTIFIC UPDATE - 12/04/21 6:00AM
1. Explosions with pyroclastic density currents at La Soufriere.
2. Since midday on April 11, the time between episodes of high-amplitude tremor has lengthened from 1.5-4 hours to 5-8 hours.
3. The episodes continue to coincide with periods of enhanced venting or explosive activity.
4. Small volcano-tectonic earthquakes were recorded starting at about 6:00pm on 11 April.
5. At about 4:15 am observations from the Belmont Observatory indicated that pyroclastic density currents (PDC) entered multiple valleys surrounding the volcano.
6. Pyroclastic density currents are hot (200°C-700°C), ground-hugging flows of ash and debris.
7. Analysis of satellite imagery and comparison with previous images indicate that the
explosive eruptions thus far have destroyed the pre-existing domes (1979 and 2020-21)
8. The current explosions are being generated from a new vent.
9. The volcano continues to erupt explosively and has now begun to generate pyroclastic density currents.
10. Explosions and accompanying ashfall, of similar or larger magnitude, are likely to
continue to occur over the next few days.
11. Visit the International Volcanic Hazard Health Network for volcanic ash information resources:
www.ivhhn.org/information10
-
-
Animation courtesy
CDEMA - Caribbean Disaster Emergency Management Agency
-
-
#uwi #uwiseismic #lasoufriere #svg #volcanoes
-
NEMO St. Vincent and the Grenadines
Department of Emergency Management
Nadma Grenada
NEMO Saint Lucia
CDEMA - Caribbean Disaster Emergency Management Agency