An undersea earthquake with a magnitude of 4.7 struck close to the Greek island of Zakynthos in the Ionian Sea on Saturday morning, the Athens Observatory said. According to local media, no casualties nor damages were reported. The epicentre of the quake that struck at 06:13 local time (04:13 GMT) was recorded between the island of Zakinthos and the port of Killini at a depth of five kilometres (three miles). Greece is one of Europe's most earthquake-prone countries.