Hi Geoff -

With the two horizontal channels,and the initial direction of the P wave =
on each channel, you can achieve a great circle course line, but you =
will not know which side of the receiving station that the event =
occurred.  To do that you also need the initial direction of the P wave =
on the vertical channel.

Bob Hancock
Three Points, AZ


On Mar 28, 2010, at 10:22 PM, Geoffrey wrote:

> Wouldn't it be possible to somehow derive a bearing
> or angle of incidence somehow relating to the
> differences between the N/S and the E/W signals
> in this EVENT posted to PSN database ?
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