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SHAKE AND BLOW
New insight may help predict volcanic eruption behavior
by Staff Writers
Liverpool, UK (SPX) May 06, 2014


Using friction experiments University of Liverpool scientists have shown that frictional melting plays a role in determining how a volcano will erupt. Image courtesy Dr. Jackie Kendrick. View a video on the research here.

A new discovery in the study of how lava dome volcanoes erupt may help in the development of methods to predict how a volcanic eruption will behave, say scientists at the University of Liverpool.

Volcanologists at the University have discovered that a process called frictional melting plays a role in determining how a volcano will erupt, by dictating how fast magma can ascend to the surface, and how much resistance it faces en-route.

The process occurs in lava dome volcanoes when magma and rocks melt as they rub against each other due to intense heat. This creates a stop start movement in the magma as it makes its way towards the earth's surface. The magma sticks to the rock and stops moving until enough pressure builds up, prompting it to shift forward again (a process called stick-slip).

Volcanologist, Dr Jackie Kendrick, who lead the research said: "Seismologists have long known that frictional melting takes place when large tectonic earthquakes occur. It is also thought that the stick-slip process that frictional melting generates is concurrent to 'seismic drumbeats' which are the regular, rhythmic small earthquakes which have been recently found to accompany large volcanic eruptions.

"Using friction experiments we have shown that the extent of frictional melting depends on the composition of the rock and magma, which determines how fast or slow the magma travels to the surface during the eruption."

Analysis of lava collected from Mount St. Helens, USA and the Soufriere Hills volcano in Montserrat by volcanology researchers from the University's School of Environmental Sciences revealed remnants of pseudotachylyte, a cooled frictional melt. Evidence showed that the process took place in the conduit, the channel which lava passes through on its way to erupt.

Dr Kendrick, from the University's School of Environmental Sciences, added: "The closer we get to understanding the way magma behaves, the closer we will get to the ultimate goal: predicting volcanic activity when unrest begins. Whilst we can reasonably predict when a volcanic eruption is about to happen, this new knowledge will help us to predict how the eruption will behave.

"With a rapidly growing population inhabiting the flanks of active volcanoes, understanding the behaviour of lava domes becomes an increasing challenge for volcanologists."

The research, published in Nature Geoscience, was funded by the European Research Council (ERC) and involved the Ludwig Maximilian University of Munich, Germany, the University of Padova, the INGV-Rome in Italy and the Kochi Core Center, Japan.

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Related Links
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Magma in Mount St. Helens rising, but no risk of eruption
Skamania County, Wash. (UPI) May 2, 2013
The magma deep inside Mount St. Helens is rising, but there's no risk of an eruption anytime soon - that according to seismologists presenting at today's annual Seismological Society of America meeting. Fresh magma began pooling deep (2.5 miles) below the volcano's surface in 2008, the result of a fresh batch of molten rock forming in the volcano's chambers pushing everything around it ... read more


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