[Rockhounds] Earthquakes can 'spark eruptions'

[Axel Emmermann]

Kreigh
 
> 
> I would expect the squeeze and release of pressure waves passing thru
> the magma would make it more fluid, much like putty gets softer as you
> work it.
[Axel] 
What would be the expanation fort that? I wonder, but then again... I always
wonder ;-)
> 
> If the pressure waves also released dissolved gasses it would certainly
> give the magma more motivation to go somewhere.

[Axel] 
Is water vapour is squeezed out of magma  would that not raise the melting
point of it?
That, in turn, could lead (I magine) to some sort of phase transition in
which some of the magma's least soluble minerals crystallize thus leaving a
less viscous magma that can easily flow about. But that's me thinking aloud
;-))))
(I think we need Pete Modreski for this one,,, Are you listening Pete?)

Cheers
Axel
> 
> On Wednesday, Dec 10, 2008, at 08:42 America/Detroit, Axel Emmermann
> wrote:
> 
> > Hi Kreigh,
> >
> > Very intriguing presumption!
> > I wonder if (and that 's one of my more simplistic theories for
> > discussion's
> > sake ;-)) magma would behave like a true fluid when pressure wave pass
> > through it.
> > Would it, just like CO2-saturated water, immediately start to release
> > its
> > dissolved gasses? (water, fluorine, CO2....)
> > This link http://www.bbc.co.uk/science/horizon/2001/killerlakes.shtml
> > somewhat translates the idea to volcanic lakes.
> >
> > I'm still working on the X-ray generating scotch tape. I'll use another
> > approach but it gets pretty cosmological too ;-))))))))))
> >
> > Cheers
> > Axel
> >
> >> -----Oorspronkelijk bericht-----
> >> Van: rockhounds-bounces at lists.drizzle.com
> > [mailto:rockhounds-bounces at lists.drizzle.com]
> >> Namens Kreigh Tomaszewski
> >> Verzonden: woensdag 10 december 2008 4:54
> >> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem
> >> collectors
> >> Onderwerp: [Rockhounds] Earthquakes can 'spark eruptions'
> >>
> >> Very large earthquakes can trigger an increase in activity at nearby
> >> volcanoes according to a new study.
> >>
> >> The controversial findings come from an analysis of records in
> >> southern
> >> Chile.
> >>
> >> It showed that up to four times as many volcanic eruptions occurred
> >> during the year following very large earthquakes than did so in other
> >> years.
> >>
> >> The work, by a team at the University of Oxford, appears in the
> >> journal
> >> Earth and Planetary Science Letters.
> >>
> >> The researchers say volcanoes lying up to at least 500km away from an
> >> earthquake's epicentre were affected.
> >>
> >> http://news.bbc.co.uk/2/hi/science/nature/7771890.stm
> >>
> >>
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