A thermal anomaly has been detected on Mount Michael on Saunders Island as seen in today's data from the MODVOLC website. This 9 times out of 10 proves that volcanic activity of some kind is going on. As the South Sandwich Islands are uninhabited and very rarely visited, it is very unlikely that this thermal anomaly which was detected in satellite data could be connected to human activity.
Thermal anomaly on Mount Michael as seen in satellite data. SOURCE: MODVOLC.