Monitoring scientists at the Belmont Observatory led by scientists from The UWI Seismic Research Centre (SRC) have noted a change in seismic activity associated with the ongoing eruption of the La Soufrière Volcano in Saint Vincent and the Grenadines. Up until 23 March 2021, the seismic activity had been dominated by very small low-frequency events which were associated with the ongoing extrusion of the lava dome. These were almost always only recorded at the seismic station closest to the dome.
However, according to a release from the National Emergency management organization in Saint Vincent, starting at approximately 10:30 local time (14:30 UTC) on 23 March 2021, the monitoring network recorded a swarm of small low-frequency seismic events which lasted for about 45 minutes. These events were different from previous activity in that they were also recorded on other stations. These events were probably associated with magma movement beneath the dome, although their depth cannot be determined. This is the first time that such a swarm has been seen since the seismic network was upgraded in early 2021.