Wow that is neat you can see the dilatation (ratifaction) of the shock wave
in the form of a spreading cloud since the low pressure & temperature condenses the
moisture into a cloud front. The intense pressure wave ( higher in temp )
must be invisible just ahead this spreading cloud front.

You see the same kind of things around jet fighter wings
and jet engine intakes when the relative humidity is high.

I wonder if stress and strain in the earth can reveal itself in some indirect way
since no one can see it directly.


----- Original Message ----- 
From: "Bob Hancock" 
To: "PSN" 
Sent: Monday, March 02, 2009 4:26 PM
Subject: Seismology & Nuclear Weapons Testing


> Interesting article from Scientific American on the use of seismology  
> to detect underground nuclear explosions.
> 
> http://www.sciam.com/article.cfm?id=advances-in-monitoring-nuclear&sc=CAT_SP_20090302
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