Hi,  After a recent e-mail to the "PSN" list, I received three great answers to my question
relating to the location of an epicentre. Dr. John Lahr  suggested that his program,
hypoellipse may be of interest. After setting the velocity model for my location and
inputting  data for my station and two AutoDrm stations, the program calculated the
epicentre of a local quake, (within 0.002 of a degree!) and that is compared to an
"A" class position. The program is very flexible and I do recommend its use.
You will need to down load the files from :

http://lahr.org/iaspei/northam/ak/s_ak/programs/hypoel/hypoel.html

Thanks,  Dr. John Lahr for this great resource.

Arie





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