Hi Tom,

The only software package that I know of that can locate events using P wave picks is 
Earthworm. It's free so anyone can use it. See http://www.isti2.com/ew/ for more 
information. Version 7.6 was released just today. Information about my EW 
installation can be found here http://www.seismicnet.com/ew/.

To locate events you need 4 or more stations centered around the area of interest and 
be able to stream the data to one location running Earthworm. I'm not sure if the 
data from the USArray is available in real-time and available to any user? One place 
to look for real-time data is here http://www.iris.edu/data/dmc-seedlink.htm. They 
might be rebroadcasting the data from the USArray to anyone needing the data.

Regards,
Larry Cochrane
Redwood City, PSN

On 11/16/2012 8:13 AM, Thomas Dick wrote:
> Since the USArray has reached my area, I would like to locate local
> events. I know the USGS and St. Louis network have this ability. Is
> there any amateur software that I could get my hands on that would allow
> me to locate "events"  using local P wave arrival times? We now have
> over twenty seismic sites with 50 miles of me.
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