Situation Reports

SITUATION OVERVIEW

The 6:00PM Scientific Advisory from the UWI Seismic Research Centre (SRC) issued on 19th April, 2021, reported the following:

  • Seismic activity at La Soufrière continued the pattern established after the explosive activity yesterday evening.
  • Small long-period and hybrid earthquakes continued to be recorded. No volcano-tectonic earthquakes, rock falls or tremor have been recorded in the last 12 hours.
  • The continuous GPS network has shown a change in horizontal and vertical movement since the initial depressurization noted immediately following the April 9 explosive
    phase.

Situation Overview

The 6:00am Scientific Advisory from the UWI Seismic Research Centre (SRC) issued on 16th April, 2021, reported the following:

  • Seismic activity at La Soufrière, St Vincent continued as before with a near-constant swarm of long-period and hybrid earthquakes. There was one band of low-level tremor at 9pm on 15 April which lasted about 40 minutes and may have been associated with a small increase in venting.

  • The first successful measurements of sulphur dioxide flux at La Soufriere volcano was undertaken along the west coast yesterday. With the assistance of the coast guard several traverses were done by boat and yielded an average SO2 flux of 809 tons per day. 

SITUATION OVERVIEW

The latest Scientific Advisory from the UWI Seismic Research Centre (SRC) issued at 6:00 AM on 15th April, 2021, reported
the following:

  • Seismic activity at La Soufrière, St Vincent continued to follow the established pattern with bands of tremor about between 13 and 15 hours apart, separated by swarms of small long-period earthquakes. The latest band of tremor started at about 2:30 am and was associated with increased venting.

SITUATION OVERVIEW

  • At 4:05am there was a huge Pelean style explosion accompanied by pyroclastic density currents on the south and south western flanks of the volcano
  • The domes formed in 1979 and 2021 have been destroyed and a deep crater with a vent now exists
  • Explosions are ongoing
  • SRC has lost connection with 4 of its 8 seismic stations and new
    seismic stations will be installed when it is safe to do so
  • The remaining 4 stations will provide the ability to monitor the
    activity and will be augmented by satellite imagery

SITUATION OVERVIEW

The latest Scientific Advisory from the UWI Seismic Research Centre (SRC) issued at 6:00 AM on 14th April, 2021, reported the following:

• Seismic activity at La Soufrière continued the pattern established yesterday (Tuesday 13th April),
• Small long-period earthquakes continued to gradually increase in number after the explosive activity at 6:30am on 13th April. These continued until another episode of              explosive activity started at 8:30 pm on 13th April. This generated continuous seismic tremor which lasted for four to five hours.

SITUATION OVERVIEW

•Explosive events continue with significant venting of ash.
•Ashfall occurred in most areas of the island overnight and in the Grenadines, Barbados, Saint Lucia and Grenada.
•Rainfall has added to the weight of ash on buildings and the remobilization of material in streams, valleys and on hills.
•Scientists informed of possible pyroclastic flows on the eastern side of the island.
•There were some reports of individuals with respiratory concerns.

  1. On 29th December 2020 the alert level for the La Soufrière volcano in St Vincent and the Grenadines was elevated to Orange because of increased activity at the site. The volcano has had an effusive eruption, with visible gas and steam eruption and the for
  2. CDEMA Situation Report #7 - Effusive Eruption at La Soufriere Volcano, St. Vincent as of 8:00 pm (AST) on March 5th, 2021
  3. CDEMA Situation Report #6 - Effusive Eruption at La Soufriere Volcano, St. Vincent as of 8:00 pm (AST) on February 22nd, 2021
  4. CDEMA Situation Report #5 - Effusive Eruption at La Soufriere Volcano, St. Vincent as of 8:00 pm (AST) on February 9th, 2021

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