The Greek island has a long history of earthquakes, but what is causing the recent series of quakes has scientists perplexed.

Experts have cautioned that while small tremors help release some energy, they don’t eliminate the risk of a major quake.

This isn't the first time Santorini has seen a ‘swarm’ of small earthquakes. A similar event occurred around the island in 2011 and 2012, but the ongoing swarm appears to be more severe.