Santorini: The Ground is Moving Again in Paradise


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Contact: Jason Maderer
Mar 13, 2012 | Atlanta, GA

santorini1.jpg
Georgia Tech Associate Professor Andrew Newman has positioned more than 20 GPS stations on Santorini. Some have moved as much as 9 centimeters since the caldera rewakened in January of 2011. Should the volcano erupt underwater, it could produce local tsunamis, which could be dangerous for cruise ships that commonly visit the tourist attraction (click to view larger).

Do a Google image search for “Greece.” Before you find
pictures of the Parthenon or Acropolis, you’ll see several beautiful photos of
Santorini, the picturesque island in the Aegean Sea. The British Broadcasting
Company named it the world’s best island in 2011. Santorini is a tourist
magnet, famous for its breathtaking, cliff side views and sunsets.

It’s also a volcanic island that has been relatively calm
since its last eruption in 1950. Until now. The Santorini caldera is awake
again and rapidly deforming at levels never seen before. Georgia Tech Associate
Professor Andrew Newman has studied Santorini since setting up more than 20 GPS
stations on the island in 2006.

“After decades of little activity, a series of earthquakes and
deformation began within the Santorini caldera in January of 2011,” said
Newman, whose research is published by Geophysical
Research Letters
. “Since then, our instruments on the northern part of the
island have moved laterally between five and nine centimeters. The volcano’s
magma chamber is filling, and we are keeping a close eye on its activity.”

santorini2.jpg
Georgia Tech Associate Professor Andrew Newman has more than 20 GPS stations on Santorini, measuring the movements of the caldera. Some instruments have moved as much as 9 centimeters since January of 2011 (click to view larger).

Newman, a geophysicist in the School of Earth and
Atmospheric Sciences, cannot be certain whether an eruption is imminent since
observations of such activity on these types of volcanoes are limited. In fact,
similar calderas around the globe have shown comparable activity without
erupting. However, Newman says the chamber has expanded by 14 million cubic
meters since last January. That means enough magma has been pumped into the
chamber to fill a sphere three football fields across.

Should Santorini erupt, Newman says it will likely be
comparable to what the island has seen in the last 450 years.

“That could be dangerous,” notes Newman. “If the caldera
erupts underwater, it could cause local tsunamis and affect boat traffic,
including cruise ships, in the caldera. Earthquakes could damage homes and
produce landslides along the cliffs.”

More than 50,000 tourists a day flock to Santorini in the
summer months (from May to October). It’s common to see as many as five cruise
ships floating above the volcano.

Assoc. Professor Andrew Newman
Andrew Newman is an associate professor in Georgia Tech's School of Earth and Atmospheric Sciences. (Andrew Newman faculty page).

Santorini is the site of one of the largest volcanic events
in human history. The Minoan eruption, which occurred around 1650 B.C., buried
the major port city of Akrotiri with more than 20 meters of ash and created
Santorini’s famous, present-day cliffs. Newman says such history will likely
not repeat itself any time soon. Such an eruption comes along once every
100,000 years, and the current inflation in the magma chamber is less than 1
percent of the Minoan blast.

Watch an animated simulation of Newman's GPS stations and their angle of movement

This project was supported in part by the National Science Foundation (NSF) (Award No. EAR-1153355). The content is solely the responsibility of the principal investigators and does not necessarily represent the official views of the NSF.

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