but dont forget Gerry, its only the really large events that are not 
relatively pinpoint.
ie. the ones that kilometres of faultline.  But even those ones, the event 
still has a
starting point and can rupture in one or both directions (unilateral or 
bilateral). With
the high density of sensors in some of the world's more active regions, 
pinpointing
isnt that difficult. And for events less than say ~ M5.5 where the rupture 
may only
be a few metres or 10's of metres, then there is no excuse for a 5 - 10 km
inaccuracy.

    My real gripe in my previous post was really aimed at why the USGS 
doesnt use data from the local network organisations to produce good 
published data.

cheers
Dave


At 02:11 PM 6/11/2011 -0600, you wrote:
>Thanks Dave,
>
>With after thought, I wanted to retract my question about location.  The 
>exact epicenter is not a specific point but an area, which might be 
>miles!  The general depth might be more precise, but maybe not exact either.
>
>Realistically, it probably does not matter that much.  You do no have to 
>know what cross streets a tornado hits, if it destroyed a town!
>
>Thanks again,
>Jerry

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