Tag Archives: volcan

Colima lahar videos

Posted on December 27, 2011 by John A. Stevenson

The Indonesian word, lahar, is the technical term used to describe volcanic mud flows. This post explains the difference between two types of lahars (hyperconcentrated flows and debris flows), using videos that I recorded at Volcán de Colima as examples. … Continue reading →

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A taste of Hekla

Posted on August 2, 2011 by John A. Stevenson

Queen of Icelandic volcanoes Hekla is the Queen of Icelandic volcanoes, famed and feared throughout Middle-Ages Europe as news of her fierce eruptions percolated back to the continent.  She was in the news again recently when GPS sensors detected ground … Continue reading →

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Eyjafjallajökull anniversary: what we have learned

Posted on April 14, 2011 by John A. Stevenson

A year ago today, the summit eruption of Eyjafjallajökull began, producing a large ash cloud that wreaked havoc with aviation.  Last week, at the European Geosciences Union conference, scientists presented the results of their studies into how it all happened.  … Continue reading →

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Ash cloud closes UK airports: what are the chances?

Posted on February 21, 2011 by John A. Stevenson

Quite high, actually. And I’m not just talking from a geologist’s perspective, where the planets whizz around the sun, the continents glide across the surface of the Earth, and volcanoes pop off continuously, like bubbles in a simmering stew.  A … Continue reading →

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