A seismologist from the European-Mediterranean Seismological Centre has said it may take “weeks” to see how the ongoing earthquakes disrupting Santorini and other Greek islands evolve, warning that the disruption seen so far could amount to foreshocks ahead of a larger quake.

A magnitude 5.2 earthquake shook the Greek Aegean islands on Sunday, beginning another week of what geologists are calling an extended earthquake swarm that has sent tourists and residents fleeing.