Study of rock samples suggests Campi Flegrei could be re-entering a new phase of pressure buildup

**Study of rock samples suggests Campi Flegrei could be re-entering a new phase of pressure buildup
A view of the Campi Flegrei caldera from Posillipo hill. Credit: Francesca Forni

A team of researchers from ETH Zürich, Cardiff University, Istituto Nazionale di Geofisica e Vulcanologia and Sapienza-Università di Roma has found evidence that suggests Campi Flegrei could be re-entering a phase of pressure buildup. In their paper published in the journal Science Advances, the group describes their study of rock samples collected from the area and what they found.

The Phlegraean Fields (part of which is known as Campi Flegrei) is an area located near the western coast of Italy that has a long volcanic history—there are 24 craters and other land shapes in the vicinity that have come about due to eruptions. The most recent was not very violent but it did create a mountain in the area back in 1583—it has been named, Monte Nuovo. Notably, Campi Flegrei is also close to Naples—to the west. Vesuvius is to the east. In this new effort, the researchers have been studying collected in the area to learn more about the history of eruptions. By learning more about the conditions that lead up to eruptions, volcanologists hope one day to figure out how to predict eruptions.

Prior research has shown that Campi Flegrei experienced two major eruptions over the past 60,000 years—one approximately 15,000 years ago, and one 39,000 years ago. Both have been described as cataclysmic, offering a hint of what might occur should the erupt similarly today—the area is home to approximately 1.5 million people. There have also been numerous smaller eruptions. What they all have in common are changes to rocks, glass and minerals that are moved from underground to the surface by geologic forces. The researchers studied rocks known to have been blasted or forced from the ground due to multiple eruptions and then compared them to see if they could spot patterns.

The researchers found evidence suggesting that Campi Flegrei might be entering a new phase of pressure buildup—one that could potentially precede an eruption. But they also note that they found no evidence that suggests the volcano might erupt any time soon. The type of build-up they describe occurs over hundreds or thousands of years.


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Campi Flegrei volcano eruption possibly closer than thought

More information: Francesca Forni et al. Long-term magmatic evolution reveals the beginning of a new caldera cycle at Campi Flegrei, Science Advances (2018). DOI: 10.1126/sciadv.aat9401
Journal information: Science Advances

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Citation: Study of rock samples suggests Campi Flegrei could be re-entering a new phase of pressure buildup (2018, November 15) retrieved 20 May 2019 from https://phys.org/news/2018-11-samples-campi-flegrei-re-entering-phase.html
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