A strong earthquake off Ikaria was registered shortly after 6 in the morning .
Specifically, there was a seismic tremor of magnitude 5.1 on the Richter scale with the first data indicating a epicenter 20km northwest of Ikaria.
The focal depth of the earthquake was 17.5 km.
Nine minutes later there was another strong earthquake measuring 4 on the Richter scale also at the same point, 23 kilometers northwest of the island. The focal depth of the second vibration was 24.3 km.
