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[OM] More Chinook Pass and the debut of Mt. St. Helens

Subject: [OM] More Chinook Pass and the debut of Mt. St. Helens
From: usher99@xxxxxxx
Date: Thu, 16 Apr 2009 20:16:33 -0400
Thanks for posting, Chuck.  Niice light indeed and well captured.  Well 
worth waiting for.  The last defies that the 50:50 horizon ratio needs 
to be avoided.
I am no geologist, but perhaps the 300mph seems a bit much given the 
viscosity of the rock/ash/gas miixture even at a steepish gradient.  
I'd buy 1/3 to 1/6 that rate as more reasonable as a maximal flow rate. 
  Still, better run fast. I'd bet the 5D doesn't like ash given its 
performance in Antartica.  If it's erupting, consider a D3. :-)

Mike




Photos in the order they were taken.  The first three are Chinook Pass
on the east side of Mt. Rainier including the one already shown here.

The last is looking into the caldera of Mt. St. Helens across the 
valley
near the visitor's center.  Had I been standing in that same spot when
it erupted I'd have not only been dead but probably never found.  The
pyroclastic flow went down into the valley and then back up the ridge I
was standing on and bowled right over the top of the ridge at about 300
mph.  But Google Earth says Mt. St. Helens is about 30 miles away from
the visitor's center so I'd have had about 6 minutes to make a run for
it.  :-)

More Mt. St. Helens to come.  The light was good.
<http://www.chucknorcutt.com/Mt%20Rainier/index.htm>

Chuck Norcutt
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