Stephen,

WinQuake uses the following formula to calculate mb magnitude

mb = log10(A/T) + 0.01*D + 5.9

A = Peak P wave displacement amplitude in micrometers, T = Period of the displacement 
amplitude and D = Distance in degrees

See http://www.eas.purdue.edu/~braile/edumod/as1mag/as1mag3.pdf for more information.

Regards,
Larry Cochrane
Redwood City, PSN

Stephen & Kathy wrote:
> mornin,    I've been trying to find a table or chart or formula which 
> will yield the Q(Delta,h), distance and depth values which I can use to 
> plug into the Mb magnitude formula!!   Thanks in advance for any help in 
> finding it!!!
>    Stephen
>    PSN Station #55
>    near Pilot Hill Ca. USA
>    38.828N  120.979W
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