The United States Geological Survey recorded a Magnitude 4.7 Earthquake at a depth of 8.4 km in the Central Macedonia Administrative Region of northern Greece, 40 km to the east of the regional capital, Thessalonika, at about 8.15 am local time (about 5.15 am GMT) on Friday 11 October 2013. There are no reports of any damage or casualties arising from this quake, though it is likely to have been felt locally.
The approximate location of the 11 October 2013 Central Macedonia Earthquake. Google Maps.
Southern Greece and Turkey lie on the boundary between the Eurasian and African Plates on two smaller plates, the Aegean Sea Plate (underlying the Peloponnese, Attica, The Cyclades Islands, Crete, the Dodecanese Islands and Turkey to the southeast of the Taurus Mountains) and the Anatolian Plate (underlying most of the rest of Turkey). Northern Greece and the north coast of Turkey lie on the Eurasian Plate. Both countries are highly prone to earthquakes because of this.
The Aegean Sea Plate is moving southwest with regard to the Eurasian and Anatolian Plates, and being subducted beneath the African Plate to the south. Its margin with the Eurasian Plate is a divergent and a transform margin at different points. Beneath the Phthiotis it is both a divergent, where the plates are moving apart, and a transform margin where they are moving past one-another laterally. This is not a smooth process, with rocks tending to stick together, then being forced to move as the pressure builds up, typically in stops and starts that lead to Earthquakes.
See also Magnitude 5.3 Earthquake in the southeast Carpathian Mountains, Romania, Two Earthquakes shake Central Greece, Magnitude 4.5 Earthquake under the Ionian Sea, Magnitude 4.6 Earthquake in western Romania and Magnitude 4.4 Earthquake of the south coast of Crete.
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