There was an earthquake swarm starting in Hengill volcano. This earthquake swarm is at the usual location, close to the hydro-thermal power plant. But this earthquakes happen as the hydro-thermal power plant pumps down cold water into the ground.
This earthquake swarm started at 18:08 UTC on 04.02.2012. The largest earthquake so far in this earthquake swarm is an ML2.5 in magnitude according to automatic results from Iceland Met Office.
It is hard to know for sure if this is just the start of the earthquake swarm or not. But earthquake swarm have been common in this area over the past few months due to water being pumped down into the ground.