CNN  —  In recent times, the main problem facing Greece’s picturesque island of Santorini has been the crowds of tourists jostling for space among the whitewashed walls of Oia town as they hunt for the best spot for sunset selfies. Then, earlier this year, another problem reared its head — one that has been lurking deep beneath Santorini millions of years before camera phones turned it into an Instagram playground. Between January 26 and February 22, more than 20,000 minor earthquakes of

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