[Rockhounds] There may be a supervolcano under Mt. St. Helens

[Axel Emmermann]

Yes, explosive decompression... 
This can happen with CO2 dissolved in water too.
See http://www.geology.sdsu.edu/how_volcanoes_work/Nyos.html
Magma appears to be doing something similar... when during eruptions, the
magma in a volcanic pipe gets nearer to the surface, the pressure becomes
low enough for gases to exsolve. This forms bubbles in the magma which
lowers the specific gravity of the magma in the upper part of the pipe. This
again relieves pressure from the underlying parts of the pipe so they can
"foam". It's a chain reaction.

matter of the earth's crust is still orbiting the planet as a result of the
explosion of the Eifel caldera ... I guess the moon is reasonably safe.
Maybe the far side?

Axel

> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]
> Namens Kreigh Tomaszewski
> Verzonden: dinsdag 16 juni 2009 6:30
> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Onderwerp: Re: [Rockhounds] There may be a supervolcano under Mt. St.
Helens
> 
> Axel,
> 
> The real problem with super volcano events is the collapse of the roof
> over the giant magma chamber that causes lava to explode/erupt around
> the edges of a circle a hundred or more miles in diameter.
> 
> Safety valves can take the pressure off, but the pressure can hold the
> roof up. Gas in the magma just makes the spray more spectacular.
> 
> I think the best view would be from orbit, or the Moon's surface (for
> safety). I can only hope we are collecting together on Luna the day of
> the eruption.
> 
> Kreigh
> 
> 
> 
> 
> On Monday, Jun 15, 2009, at 05:09 America/Detroit, Axel Emmermann wrote:
> 
> > Ok, I'll stay... but you'd better be serious about that safety valve
> > ;-))))
> >
> > Anyway, to start a supervolcano the magma chamber needs to be more
> > than vast
> > alone, the magma itself needs to be rich in gases. It needs to expand,
> > refill the chamber after the initial blast has evacuated  the first
> > magma.
> >
> > See the experiment with the Cola bottle and the peppermint...
> >
> > Axel
> >
> >
> >> -----Oorspronkelijk bericht-----
> >> Van: rockhounds-bounces at lists.drizzle.com
> > [mailto:rockhounds-bounces at lists.drizzle.com]
> >> Namens Kreigh Tomaszewski
> >> Verzonden: maandag 15 juni 2009 3:37
> >> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem
> >> collectors
> >> Onderwerp: Re: [Rockhounds] There may be a supervolcano under Mt. St.
> > Helens
> >>
> >> Hey Axel,
> >>
> >> It is only a problem if it erupts as a supervolcano. Mt. St. Helens
> >> may
> >> be acting as a safety valve.
> >>
> >> Besides, compared to the Yellowstone supervolcano, it is just a small
> >> one.
> >>
> >> Kreigh
> >>
> >>
> >> On Sunday, Jun 14, 2009, at 17:48 America/Detroit, Axel Emmermann
> >> wrote:
> >>
> >>> We are doomed.... doomed , I tell you!
> >>>
> >>> That's it, I'm moving to a safer planet ;-))))
> >>>
> >>> On the bright side: now we probably know WHY E.T. wanted to phone
> >>> home
> >>> so
> >>> badly.... GET ME OFF THIS DISASTROUS PLANET....
> >>>
> >>> Cheers
> >>> Axel
> >>>
> >>>
> >>>
> >>>> -----Oorspronkelijk bericht-----
> >>>> Van: rockhounds-bounces at lists.drizzle.com
> >>> [mailto:rockhounds-bounces at lists.drizzle.com]
> >>>> Namens Kreigh Tomaszewski
> >>>> Verzonden: zondag 14 juni 2009 3:03
> >>>> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem
> >>>> collectors
> >>>> Onderwerp: [Rockhounds] There may be a supervolcano under Mt. St.
> >>>> Helens
> >>>>
> >>>> IS A supervolcano brewing beneath Mount St Helens? Peering under the
> >>>> volcano has revealed what may be an extraordinarily large zone of
> >>>> semi-molten rock, which would be capable of feeding a giant eruption
> >>>>
> >>>> http://www.newscientist.com/article/mg20227124.700-supervolcano-may-
> >>>> be-
> >>>> brewing-beneath-mount-st-helens.html
> >>>>
> >>>>
> >>>> --- StripMime Report -- processed MIME parts ---
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> >>>>   text/enriched
> >>>> ---
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