Qualla: Chaitén Volcano

Chaitén Volcano: Introduction

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Sam Beebe, CC BY 2.0. For thousands of years it had done nothing. Chaitén is a broad volcanic caldera, three kilometers across, its rim rising to 1,122 meters above the rainforests and fjords of southern Chile. Radiocarbon dating once suggested its previous eruption lay more than nine thousand years in the past, and the people who built the town of Chaitén ten kilometers to the southwest had no reason to think of the green caldera as a threat. Then, in the first days of May 2008, the mountain came violently back to life for the first time in roughly four centuries. Within days a town of more than four thousand people would be evacuated, and within weeks much of it would be gone, buried under ash and swept away by a river that changed its course.

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Image: Sam Beebe | CC BY 2.0

Chaitén Volcano: The Mountain Wakes

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit MartaSalazar, CC BY-SA 3.0. The eruption began in the early hours of May 2, 2008, after only about a day of warning earthquakes, an unusually short prelude for so large an event. A column of ash climbed kilometers into the sky and drifted east across the Andes, dusting towns in Argentina's Chubut province a...

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Image: MartaSalazar | CC BY-SA 3.0

Chaitén Volcano: A River Rewrites the Town

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Gerard Prins, CC BY-SA 3.0. The ash was only the beginning. Beginning around May 12, heavy rain mixed with the deep volcanic ash to form lahars, fast-moving slurries of mud and debris that poured down toward the coast. The mud flooded Chaitén, burying parts of the town under a meter or more of grey sludge a...

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Image: Gerard Prins | CC BY-SA 3.0

Chaitén Volcano: An Eruption Scientists Had Been Waiting For

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Gerard Prins, CC BY-SA 3.0. What made Chaitén remarkable was not only its violence but its chemistry. The volcano erupted rhyolite, a thick, silica-rich magma that tends to produce especially explosive eruptions and that geologists rarely get to watch in action. Chaitén's 2008 event was the first major expl...

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Image: Gerard Prins | CC BY-SA 3.0

Chaitén Volcano: Coming Back to a Changed Place

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Gerard Prins, CC BY-SA 3.0. The danger did not end with the first eruption. In February 2009 part of the lava dome collapsed, sending pyroclastic flows down the river valley to within about five kilometers of the town, and the roughly 160 people who had drifted back were urged out again. The government cons...

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Image: Gerard Prins | CC BY-SA 3.0