Soufrière St. Vincent volcano: Eruption Update

Aktualisiert: 21. Jan. 2022 23:57 GMT - Neu laden

Soufrière St. Vincent volcano (St. Vincent Island, West Indies): eruptive phase ended

Mi, 1. Dez 2021, 04:36
04:36 AM | VON: MARTIN
The summit crater at Soufrière St. Vincent volcano (image: UWI)
The summit crater at Soufrière St. Vincent volcano (image: UWI)
Volcanologists from the University of the West Indies (UWI) ended their field research in St. Vincent and the Grenadines
after almost one year of observations, when the new lava dome at the volcano was detected in December last year and are about to leave the local Belmont observatory.
The Soufrière St. Vincent volcano's activity continues at decreasing values since the last explosive eruption on 22 April and all monitoring data indicate the end of the eruptive episode.
Remaining gas and steam plumes and lahars will be monitored remotely from its base in Trinidad and Tobago.
The UWI-SRC's volcanologist prof. Richard Robertson said: “The mountain went through a traumatic experience and will take some time to reshape itself”.
The alert level for the volcano remains at "yellow".
Source: University of the West Indies volcano activity update 30 November 2021

Soufrière St. Vincent volcano (St. Vincent Island, West Indies): Volcanic Alert Level lowered to Yellow

Do, 16. Sep 2021, 06:12
06:12 AM | VON: MARTIN
Installation of the seismic station at the summit of the volcano on 1 September (image: @uwiseismic/twitter)
Installation of the seismic station at the summit of the volcano on 1 September (image: @uwiseismic/twitter)
The University of the West Indies (UWI) reported that the alert level for the volcano was lowered to "yellow".
The activity at the volcano has decreased over the past three months associated by continuous degassing from the summit vent.
Source: The University of the West Indies volcano activity update 16 September 2021

Soufrière St. Vincent volcano (St. Vincent Island, West Indies): new images of 2021 crater area and western flanks

Mi, 16. Jun 2021, 19:16
19:16 PM | VON: MARTIN
Hydrothermal areas are active in the 2021 crater (image: @uwiseismic/twitter)
Hydrothermal areas are active in the 2021 crater (image: @uwiseismic/twitter)
Upper slopes of the volcano covered by tephra deposits (image: @uwiseismic/twitter)
Upper slopes of the volcano covered by tephra deposits (image: @uwiseismic/twitter)
Valley on the western flank of the volcano affected by pyroclastic density currents (image: @uwiseismic/twitter)
Valley on the western flank of the volcano affected by pyroclastic density currents (image: @uwiseismic/twitter)
The University of the West Indies (UWI) revealed another new post-eruption aerial images taken on 12 June. Pilots from HMG Guardian focused on the 2021 crater area and western flanks of the volcano.
A look into the new crater shows several hydrothermal areas that are responsible for a continuous degassing.
A total destruction of vegetation can be observed on the upper slopes of the volcano related to massive eruptions during April this year. This area is currently covered by thick tuff layers (tephra/pyroclastic material deposits) where heavy rainfalls whittled new-formed V-shaped gullies.
They also took a picture of a valley on the western flanks of the volcano that has been affected by pyroclastic flows. This phenomenon is deadly, turbulent hot avalanche of lava rock fragments of all sizes embedded in a mixture of turbulent gas and ash racing down slopes.
In addition, no new lava dome is observed from available images.

Soufrière St. Vincent volcano (St. Vincent Island, West Indies): latest image reveals 2021 crater

Do, 3. Jun 2021, 09:08
09:08 AM | VON: MARTIN
New 2021 crater formed next to 1812 crater (image: @uwiseismic/twitter)
New 2021 crater formed next to 1812 crater (image: @uwiseismic/twitter)
A remarkable aerial image, taken on 29 May, depicts a new crater formed after the series of massive explosions during April this year.
The crater is located next to 1812 crater as can be seen in the attached image.
The volcano continues at seismic unrest.
A near-constant gas and steam venting continues from the summit crater. Sulfur dioxide (SO2) emissions reached to a 461 tonnes/day on 20 May.
Satellite-based images confirmed that no actively growing lava dome appears within the summit crater at this moment and there is no indication that the volcano will return to a dome growing phase again.

Soufrière St. Vincent volcano (St. Vincent Island, West Indies): volcano remains at seismic unrest

Di, 25. Mai 2021, 09:48
09:48 AM | VON: MARTIN
The image of the Soufrière St. Vincent volcano's summit crater depicts uplifted area accompanied by venting of steam and gas (image: @News_784/twitter)
The image of the Soufrière St. Vincent volcano's summit crater depicts uplifted area accompanied by venting of steam and gas (image: @News_784/twitter)
After little more than one month since the last eruption on 22 April, the volcano continues at seismic unrest.
A volcanologist Dr. Adam Stinton from the Belmont observatory noted: "Since the morning of Friday 21st, there have been a handful of earthquakes, just around 20-25. None of the earthquakes are large enough to be felt at the moment; the average per day is about 10-15 since the last explosion on April 22nd".
A near-constant gas and steam venting continues from the summit crater.
Satellite-based images confirmed that no actively growing lava dome appears within the summit crater at this moment and there is no indication that the volcano will return to a dome growing phase again. Judging from the attached image, an uplifted area in the inner summit crater may indicate either extruded magma towards the surface or tephra accumulation immediately after the last eruption.
According to NASA FIRMS a high thermal anomaly continues to be detected within the summit crater.
Sulfur dioxide (SO2) emissions reached to a 461 tonnes/day on 20 May.
The Volcanic Alert Level remains at Orange.
Source: News 784 25 May 2021

Soufrière St. Vincent volcano update: Volcanic Alert Level lowered to Orange

Fr, 7. Mai 2021, 07:29
07:29 AM | VON: MARTIN
Volcanic Hazard Zones at Soufrière St. Vincent volcano (image: NEMO)
Volcanic Hazard Zones at Soufrière St. Vincent volcano (image: NEMO)
The National Emergency Management Organization (NEMO) in collaboration with University of the West Indies's scientists decided to lower the Volcanic Alert Level from "red" to "orange" as a significant decrease of volcano-tectonic earthquakes have been recorded. In addition, no explosions occurred at the volcano since 22 April.

NEMO bulletin cites further:
"An orange Volcano Alert Level means that the volcano may resume explosions with less than twenty-four hours'notice. As a result of this, the Government of St. Vincent and the Grenadines have also taken the decision that residents of communities in the orange zone from Petit Bordel to Gordon Yard on the Leeward side of the island and up to Mt. Young near the RUBIS Gas Station on the Windward side of the island, can return home and carry out normal activities."

Lahars (mud flows) could continue to occur if heavy rainfalls remobilise the fresh ash deposits in valleys including Wallibou and Rabacca valleys.
Source: The University of the West Indies volcano activity update volcano activity update 7 May 2021
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