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??finding distance of E.Q. from given location??

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All,

In trying to determine distance from epicenter of Hector-Mine and Northridge
earthquakes from some project sites I found the following link that can help
in converting the longitude latitude information to distances
http://www.best.com/~williams/gccalc.htm. I have not looked at exactly how
this is developed, but it seems the site is developed by a pilot for a
pilot. Have you used something like this before? Would you know of a more
reliable way to estimate the distances (except scaling off the maps)?

Thanks for any input and feedback.


Ghassem.