Earthquakes in North Iceland, 31 March - 4 April 2013. Mainshocks are shown as black stars, manually revised aftershocks are shown as red circles. The M5.5 mainshock is located on a north-south striking left lateral strike-slip fault (see red and white symbol). Earthquakes from 1992-2012 are shown as black dots (black lines are mapped faults). Click to enlarge.