Soufrière St. Vincent volcano (West Indies, St. Vincent): gas measurements confirmed sulfur dioxide emissions; first since Dec 2020
The extruded lava dome is about 93 m tall, 231 m wide and 511 long and had a volume of 5.93 million cubic meters by 1 February reported by the University of the West Indies Seismic Research Centre (UWI-SRC).
On 1 February a gas measurements revealed the presence of sulfur dioxide (SO2) emissions, first since the eruption started. The absence of sulfur dioxide (SO2) emissions in the early stages of the eruption was due to the interaction of SO2 with the groundwater as SO2 dissolves in groundwater. The gas escaping suggests that the groundwater is drying up.
Remaining gas measurements detected the presence of hydrogen chloride (HCl), hydrogen fluoride (HF) and hydrogen sulfide (H2S).
Gas-and-steam plumes continue to rise from the top of the dome as well as along the contact of the 1979 dome and the new dome.
Daily observations confirmed a continuous fire in the NW area of the crater that affected vegetation on vertical slope of the crater.
The Alert Level remained at Orange.
Source: University of the West Indies Seismic Research Centre volcano activity update 7 October 2021
Sulfur dioxide emissions continue to escape from the area between the pre-existing 1979 dome and the actively growing dome.
Drone footage from taken on January 24th by Rommel De Freitas who is assisting NEMO SVG.The steaming is mostly at the top of the new dome & at the interface between the new & old dome as there is now more gaps through which the steam can come through. #svg #lasoufriere #uwi pic.twitter.com/EPoFIjtRQB— UWISeismic Research (@uwiseismic) January 28, 2021