Santorini - one of Greece's most visited islands - relies heavily on seasonal workers from other parts of Greece and abroad, who help the permanent population of just over 15,000 to serve tens of thousands of tourists on the island each day in peak season.

The threat of a more major earthquake seems to have subsided on the most visited of the Greek islands but experts disagree on the origin of the tremors that have caused 11,000 of the 15,000 permanent residents to flee.