Large Earthquakes Trigger A Surge In Volcanic Eruptions

ScienceDaily (Jan. 12, 2009) — New evidence showing that very large earthquakes can trigger an increase in activity at nearby volcanoes has been uncovered by Oxford University scientists.

An analysis of records in southern Chile has shown that up to four times as many volcanic eruptions occur during the year following very large earthquakes than in other years. This ‘volcanic surge’ can affect volcanoes up to at least 500 km away from an earthquake’s epicentre.

A report of the work will be published in the journal Earth and Planetary Science Letters.
Previously, scientists had identified a few cases where volcanic eruptions follow very large earthquakes – but up until now it had been difficult to show statistically that such earthquakes may be the cause of an increase in eruptions, rather than the events just being a coincidence.

‘The most unexpected part of this discovery was the considerable distance from the earthquake rupture where these eruptions took place, and the length of time for which we saw increased volcanic activity,’ said Sebastian Watt, a Dphil student in Oxford’s Department of Earth Sciences, who conducted the analysis.
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http://www.sciencedaily.com/releases/2009/01/090110084653.htm


From what I read so far they just studied the South American chain?
I need to read the real findings from Oxford.

Agitation caused the gas to go out of solution and the pressure inside the bottle to build. Back in the days of bottle caps, it was often enough to blow the cap off, kind of like blowing a layer of rock above a magma chamber off.

I'm trying to find some other earthquake incident that occurred on the west coast
at that time.

A series of earthquakes near Mammoth Lakes, CA in 25-27 May 1980. Only earthquake(s) I could find close to Helens.

http://www.johnmartin.com/earthquakes/eqpapers/00000046.htm

But none before hand.


1979- http://earthquake.usgs.gov/eqcenter/eqarchives/significant/sig_1979.php

1980-http://earthquake.usgs.gov/eqcenter/eqarchives/significant/sig_1980.php

6.1....6.5.....,6.9 and a 7.8 but all were after the eruption.

A big quake would make lots of cracks in the rock for magma to seep through.

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