We are dealing with real life and not the ideal.
Random factors should deal the ideals
a deadly blow. I would not worry about
(as a layman) a difference of a second here and there.
But as an expert all of it means something.
The USA will dedicate a scientists full time to
a given project to understand everything,
I'm talking about a real expert who will be protected
by real security people. If you want some seemingly good
phase guesses try out the USGS Theoretical travel time calculators.
It be nice to have that program inside our windows machines
so long as we are not breaking any laws to do so.


--------------------------------------------------
From: 
Sent: Tuesday, September 21, 2010 12:20 AM
To: 
Subject: Re: Winquake phase pics for regional events

> Hi Larry,
>
> I also got this same problems. But I get thousands of small earthquakes
> every year and this is same thing with most of them. The misalignment of
> the P and S wave is something less then a second. But it is still there. I
> am like looking for a fix, but I don't have it yet.
>
> Regards,
> Jón Frímann.
>
>>   I recorded a couple of small events the other day, a 2.9 followed
>> shortly by a 2.7, at a distance of around 200 miles.  I noticed that
>> when I turn on the P and S phase marker lines in Winquake, they don't
>> line up with the P and S phase markers (ie. the veritical arrows).  The
>> amount of discrepancy depends on which table I select, and isn't all
>> that great unless I really zoom in tight.
>>
>> So, two questions.  Why the difference?  And which should I use to
>> estimate the distance to the event, the arrows or the phase lines?  (Not
>> that it really makes much difference, since I usually have a lot of
>> uncertainty where the phase onsets are anyway.)
>>
>> Larry Conklin
>> Liverpool, NY
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