PSN-L Email List Message

Subject: Re: Time/Filtering
From: John or Jan Lahr JohnJan@........
Date: Sun, 08 May 2005 18:22:32 -0600

Picking uncertainty is often in the range of 100 ms, even though the phases=
are recorded to the nearest 10 ms.  If your clock error 50 ms or less,
your data should be quite useable for locating these events.  Also, CERI=20
could use just the S
minus P time at your station, combined with P (and if possible S) times at=
the other
two stations.  Of course this will only help if the S is clear and can be=20


At 05:22 PM 5/8/2005, you wrote:
>Ok so what should I tell CERI   I am getting a lot of different numbers=20
>from the replies? Would I be ok to say with filtering I should be within=20
>+/- 50ms also will this be good enough to accurately locate a local events=
>with 3 stations less than 50 miles apart. This will explain why I ask is a=
>clip from a letter from Mitch.
> > > Hi Bryan:
> > >
> > > You can just barely see this one on our next closest stations, OXF and
> > > LRAL.
> > > These events can be seen very well on PWLA but not on a sufficient=
> > > of
> > > other stations to reliably locate it.  We only publish reliably=
> > > events.
> > > It is a bit of an enigma where the events are actually coming from=
> > > likely south of PWLA, or perhaps local and shallow) and why.  PWLA is=
> > > unusually
> > > sensitive stations and records well events not seen by the rest of the
> > > network.
> > >
> > > Center for Earthquake Research and Information (CERI)
>I talked with Mitch on the phone and he just ask me how accurate my timing=
>And he may be interested in using it. I was trying to get access to live=20
>data from Pickwick He also said he would send me an executable to do that=
>but it would have a five minute delay. He was very helpful to me and I=20
>thought it would be great to be able to contribute to their network=85.
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