Over the past week, and even the past day and hour, there has been renewed shaking at the Salton Buttes volcano. This current swarm of moderate 3.0 mag and micro-quakes (under 3.0 mag) is very numerous and over the past hour rather intense. The area where there is a vent, is closed to the public, and has been for a few moths or so. I have seen many quake swarms at this volcano since the nearby 7.2 mag Easter Earthquake, in 2010.
