The Institute of Geophysics at the Aristotle University of Thessaloniki said the temblor had a magnitude of 6.3; the U.S. Geological Survey reported a magnitude of 6.4.
The epicenter was between the islands of Samothraki and Lemnos, and was 10 kilometers (6 miles) deep, the USGS said.
Police on Lemnos say part of the ceiling at the airport fell, injuring a female British tourist, but released no further details about her injuries immediately.
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