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Before the Explosion – Volcano’s Warning Tremors Explained

By Guest PostFebruary 26, 2011Environmentalaska, ash, ash column, atmosphere, central america, david bercovici, forecast deadly eruptions, frequencies, magma wagging, mark jellinek, mathematical model, model, new zealand, phenomena in nature, pyroclastic flows, strange phenomenon, the caribbean, tremors, volcanoes, volcanologists, yale university

No matter their size or shape, explosive volcanoes produce tremors at similar frequencies for minutes, days or weeks before they erupt. In the Feb. 24 issue of the journal Nature, researchers at Yale University and the University of British Columbia describe a model that explains this strange phenomenon — and may help forecast deadly eruptions.

When such volcanoes erupt they can shoot hot ash up to 40 kilometers into the atmosphere and cause devastating destruction when the ash column collapses and spreads as “pyroclastic flows”. Prior to most of these explosive eruptions the volcanoes shake slightly but measurably, and the shaking becomes more dramatic during the eruption itself. This tremor is one of the primary precursors and warnings used by volcanologists for forecasting an eruption. (more…)

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Before the Explosion – Volcano’s Warning Tremors Explained