La Soufrière Ash Remobilized – Multiple Lahars Recorded

The La Soufrière Volcano erupting (Professor Richard Robertson, April 22nd 2021)

Present La Soufrière Alert Level:ORANGEThere is a highly elevated level of seismic and/or fumarolic activity or other unusual activity. An eruption may begin with less than twenty-four hours’ notice.

According to the latest scientific advisory from the University of the West Indies Seismic Research Centre (UWI SRC), seismic activity at La Soufrière, St Vincent has been low after the tremor associated with the explosion and ash venting around noon on 22nd April. Only a few long-period, hybrid and volcano-tectonic earthquakes were recorded and there was no further tremor.

The SRC has said the seismic network recorded signals from multiple lahars (mudflows) at about 9:00 PM on 22nd April. The locations of these lahars have not been determined. Measurements of sulphur dioxide flux (mass) at La Soufriere volcano were again undertaken along the west coast today with the assistance of the coastguard. An average SO2 flux of 992 tons per day was recorded.

Since the initial depressurization (deflation) seen immediately after the April 9th explosive phase, the continuous GPS network has recorded a decrease in the overall rates of horizontal and vertical movement.

Volcanic Hazard Map for the La Soufrière Volcano, St. Vincent (UWI SRC/NEMO)
Volcanic Hazard Map for the La Soufrière Volcano, St. Vincent (UWI SRC/NEMO)

According to the UWI SRC, 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, similar to or larger, can occur with little or no warning impacting St Vincent and neighboring islands.

The alert level remains red. The National Emergency Operations Center continues to be fully functional operating on a twenty-four-hour, around-the-clock basis. NEMO will continue to provide regular updates as they continue to monitor the Volcano.

Official information will originate from St. Vincent and the Grenadines National Emergency Management Organization and the University of the West Indies Seismic Research Center.

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