Hi Bob-
John Louie at UNR has a wonderful explanation of the Richter Mag scale
at:
http://www.seismo.unr.edu/ftp/pub/louie/class/100/magnitude.html

It plots Mag vs Yields (bombs & explosions)

Jim
On Sat, 07 Oct 2006 10:35:19 -0400 Bob Barns  writes:
> Hi gang,
>   N. Korea may test a nuclear bomb.  I realize that is a complicated 
> 
> question but maybe someone can give a rough estimate of how big a 
> seismic signal might be produced.
> Bob
> 
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