If it was a sign of something larger it probably would not be so isolated, all the geysers in the area would have gone off. I would guess this is either the for

If it was a sign of something larger it probably would not be so isolated, all the geysers in the area would have gone off. I would guess this is either the formation of a new geyser or an old one which has a long duration between eruptions or just a one off.