Yesterday Vandenburg AFB, CA launched a very large rocket at 1:10 pm 
local time.
See 
http://latimesblogs.latimes.com/technology/2011/01/delta-iv-vandenberg-rocket.html
Reports were that it could be herd for 50 miles around and so I 
wondered if it could be seismically detected?

I looked at that time from here but I am 300 mi away and all I could 
see is Ocean noise.

George 

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