Some Volcanoes Become Eerily Silent Just Before They Erupt

Here comes the boom. Gardar Olafsson/Shutterstock
Robin Andrews 28 Jun 2016, 11:41

Predicting when a volcano will erupt is a complex and somewhat Sisyphean task. When a team of volcanologists think that they’ve nailed precisely how to tell when an eruption will occur, a separate volcanic event or an unexpected blast shows them that there’s still a lot to learn.

Recent studies all seem to have one thing in common, though: Immediately before an eruption is due to take place, there is some sort of activity at the vent or just beneath the surface, whether that be a sudden uptick in gaseous emissions, ground deformation, smaller ruptures at the surface, or – most significantly of all – seismic activity.

Writing in the journal Earth and Planetary Science Letters, a team of geophysicists have come to a rather striking conclusion: In some cases, there is absolutely no activity prior to a volcanic eruption, somewhat in the same way that there is no activity immediately preceding a major earthquake along a fault line.

Telica Volcano, the case study for this particular piece of research. Riderfoot/Shutterstock

“It is the proverbial calm before the storm,” lead author Diana Roman, a volcanologist at the Carnegie Institution for Science, said in a statement.

The team focused their efforts on Telica Volcano in Nicaragua, a tall, dangerous stratovolcano in the same category as Mount St. Helens. They began monitoring this small fiery mountain in 2009, and by 2011, they had a network of equipment analyzing every possible physical characteristic of the volcano within a 4-kilometer (2.5-mile) radius.

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