Scientists studying Mount Etna have discovered that carbon dioxide and water influenced two historic eruptions in distinct ways, shedding light on the complex underground magma movements that cause volcanic explosions.
- Water-rich magma paused near the surface before erupting in one event
- Carbon dioxide-rich magma rose quickly from deep underground in another
- New findings help improve predictions of volcanic hazards
What happened
Mount Etna, one of Europe’s tallest active volcanoes, has experienced violent eruptions in its past despite its relatively mild present activity. Recent research led by Cornell University, with contributions from Columbia’s Lamont-Doherty Earth Observatory, investigated two historic eruptions by analyzing field samples collected directly from the volcano. These samples included tephra, the rocky fragments expelled during eruptions, which hold crystals with microscopic gas bubbles preserved from magma.
Using advanced Raman spectroscopy, the scientists identified the gases trapped inside these bubbles, primarily focusing on water and carbon dioxide. Their studies revealed that in one eruption dating back to 122 B.C., water-rich magma slowed down and accumulated at shallow depths for weeks before erupting, while another eruption was driven by rapidly ascending magma rich in carbon dioxide originating over 20 kilometers underground. This contrast highlights the complexity of Etna’s volcanic plumbing system.
Why it feels good
These findings offer more than fascinating geological insights — they advance our ability to predict volcanic behavior and assess risks. Understanding the distinct roles that water and carbon dioxide play in triggering eruptions allows scientists to better interpret signals from active volcanoes, potentially improving early warning systems for nearby communities.
Moreover, this work challenges long-held assumptions that mafic magma erupted at Mount Etna couldn’t be explosive. Instead, it reveals how carbon dioxide can power some of the volcano’s most dramatic events, enriching the scientific narrative of why even seemingly gentle giants can have violent episodes.
What to enjoy or watch next
Mount Etna remains a popular destination for climbers and skiers who benefit from understanding the volcano’s behavior. As researchers continue to refine physical models of volcanic plumbing and gas dynamics, future studies will likely reveal more about the timing and nature of eruptions, which could be crucial for regional safety.
For those fascinated by volcanoes, upcoming investigations at Etna and other sites using gas bubble analysis and new monitoring techniques promise to deepen our appreciation for the forces shaping our planet. Watching for updates from scientific teams working in volcanic regions can offer a front-row seat to this dynamic natural world.