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

How long will the state of emergency last? It’s very difficult to predict how long the earthquakes will last and, as a result, when the state of emergency will come to an end. But authorities have said activity could go on for weeks.

Repeated earthquakes are rattling Greece’s volcanic island of Santorini. Scientists say the quakes aren't related to a slight increase in volcanic activity that has also been registered recently.