© Simm, Wikimedia CommonsBuildings perched on the rim on Santorini volcano.
The iconic white roofs of the Greek isles of Santorini may not stay that way forever. Those buildings are perched, after all, on the rim of a massive underwater volcano blamed for destroying the Minoan civilization of Crete. And it's restless.
About 3600 years ago, at the height of Minoan civilization, Santorini let loose with one of the largest volcanic eruptions in history. The explosion blanketed nearby islands with piles of ash hundreds of feet thick and sent out a gigantic tsunami that devastated Crete, about 68 miles to the south.
Smaller eruptions across the ensuing millennia ended abruptly in 1950. Then, after 60 years of calm, the caldera reawakened early last year with an escalating swarm of earthquakes. When geologists took a closer look, they could see the ground was swelling as well, as though the sleeping giant were yawning.
The earthquakes and ground deformation scientists observed between 2011 and early 2012 are unprecedented since the 1950 eruption. But just because a volcano is sucking in breath doesn't mean it will spew. Iceland's Eyjafjallajökull stratovolcano really let loose in 2010 after its own swarm of deformation-driven tremors, but Long Valley caldera in California has been breathing heavily since 1980 with no eruption at all.
So, what's in store for Santorini?
Comment: The article mentions that a 2.1 magnitude earthquake produced a 'loud boom' but it was not recorded on the USGS site. Perhaps the 'loud boom' was from a different source?