In the last 3 days there has been an increase in the seismic activity on the island of El Hierro. There have been over 330 earthquakes registered, according to the IGN website. 201 of these were between 2 and 3 degrees on the Richter scale.
So far this morning (Monday 17th September 2012) there have been 13 earthquakes recorded on the island of El Hierro as the seismic activity recommences. At 01:24 there was an earthquake which measured 3 degrees on the Richter scale which was felt by the population.
See image of the latest three day map location of events on the island.