I think earthquakes are natural. So, no... nothing strange.
You'll note that Greek earthquake history has its own Wikipedia page. There have been whoppers of 8.0 and larger there, going back as far as 464 BC, but even some huge ones in the 1950s.
It's like the San Francisco of the Mediterranean.
Little ones probably happen all the time.
http://en.wikipedia.org/wiki/List_of_earthquakes_in_Greece

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