Strongs Earthquake Shakes Greece’s Evia and Athens

"At 12:58 in the afternoon local time, the ground beneath northern Greece broke in a way that

left seismologists with a problem they still aven't solved. Not one earthquake, two 4 minutes apart.
Roughly 80 km, 50 mi to the south. 4 minutes later, the same fault zone struck again. This time harder, 5.2.
A third tremor followed shortly after, rated at 4.3, striking the same localized area. By early afternoon, dozens of smaller aftershocks were already being recorded by seismometers across central Greece." GeologyInfo