St. Vincent & Grenadines

Explosive Eruption at La Soufrière Volcano, St. Vincent - Situation report No. 21 as of 8:00 PM on 22 April, 2021

Format
Situation Report
Source
Posted
Originally published
Origin
View original

Attachments

Seismic activity continues at the La Soufriere, St. Vincent

The 6:00PM Scientific Advisory from the UWI Seismic Research Centre (SRC) issued on 22nd April, 2021, reported the following:

  • Seismic activity at La Soufrière, St Vincent continued the pattern established after the explosive activity on 18 April.

  • Small long-period and hybrid earthquakes continued to be recorded, with their rate of occurrence gradually increasing.

  • High-level seismic tremor started at 11:09am, generated by explosive activity, and lasted for about 20 minutes.

  • A vertical explosive eruption plume rose slowly above the crater eventually reaching a height of about 8 km.

  • During the initial stages of the explosion, a base surge (pyroclastic density current) was seen moving down the western flank of the volcano.

  • Tremor continued, at a lower level, for the next two hours as La Soufrière continued to vent ash.

  • 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.

  • Explosions with accompanying ashfall, of similar or larger magnitude, can occur with little or no warning.

  • The volcano is at alert level Red.