Dear Sanjay,
Keeping a look at these two images, I feel there may be two errors
associated with your observations:
1. You might have chosen wrong P and S / in alternate way the GPS time will
not properly synchronize
Suggestion 1: Kindly check your P and S mark
2: Properly check the GPS time tick / Such RMS infers
that there may be minutes of error associated with
GPS time .
2. Look at the position of the event, if any event is very close to a
station, then also RMS error associated with Chosen velocity structure for
a particular station increases. But RMS difference of ~22 sec is quite
unethical to associate this error with the local velocity structure.
I am very much sure, either you have chosen wrong P and S mark Or you have
serious problem with your GPS time.
with regards,
Anup Kumar Sutar
Project Scientist-B
MoES
On Sat, Feb 21, 2015 at 9:01 PM, <[email protected]> wrote:
> Today's Topics:
>
> 1. Re: Station pick error (Sanjay Singh Negi)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 21 Feb 2015 20:55:13 +0530
> From: Sanjay Singh Negi <[email protected]>
> Subject: Re: [seisan] Station pick error
> To: "Yrd.Doc.Dr.Mehmet Ozyazicioglu" <[email protected]>
> Cc: [email protected], p friberg <[email protected]>
>
> Hello,
> Dear Paul and Mehmet I am glad to receive your responses.
> I would like to state that we are using taurus digitizer at each
> site.
> As I want to utilize this station anyhow please can you elaborate
> the idea using option 9 in s-file.
>
> As after your response I pinged and collected some details about
> the stations' state of health during 2012.
> The information I received explains that the GPS at ABI during
> the above mentioned period was not working and we are at loss
> with three months of data. The VSAT network was still sending the packets
> of data for this particular station.
>
> So for now I am with another query which may be a little bit silly but, can
> we synchronize the bad station time on the basis of already existing other
> stations time information.
>
> With Regards
>
> --
> *SANJAY SINGH NEGI *
> *Senior Research Fellow(SRF)*
> *Wadia Institute of Himalayan Geology*
> *33 - GMS Road,*
> *Dehradun.*
> *Mob no.- +91-9536145596*
>
>
> *-------------------------------------------------------------------------------------------------------------------------------------------------*
>
> ?
> On Fri, Feb 20, 2015 at 9:51 PM, Yrd.Doc.Dr.Mehmet Ozyazicioglu <
> [email protected]> wrote:
>
> > I agree with the possibility of GPS error , occasionally we also suffer
> > from similar GPS faults in Turkey.
> > In this case until you correct the GPS antenna or card, you can still use
> > option 9 in s-file to locate using
> > P minus s times
> >
> > Best regards,
> >
> > Mehmet
> >
> > ------------------------------
> > *Kimden: *"Paul Friberg" <[email protected]>
> > *Kk: *[email protected]
> > *Gönderilenler: *20 ?ubat Cuma 2015 15:49:07
> > *Konu: *Re: [seisan] Station pick error
> >
> > Sanjay,
> > If you are 100% certain about your P and S picks, and If the lat/lon of
> > your station ABI is still correct, then it must be a timing issue. Your
> > station ABI may be suffering a timing advance or lag problem. It is not
> > unusual for modern digitizers to lose GPS lock and drift...but it seems
> > pretty severe from the screenshots you showed. Could there be vegetation
> > covering the GPS antenna or some other blockage. What flavor of digitizer
> > is ABI running?
> >
> > Regards,
> >
> > Paul
> >
> > On Fri, Feb 20, 2015 at 8:11 AM, Sanjay Singh Negi <[email protected]>
> > wrote:
> >
> >> Hi all,
> >> I have a continuous time series earthquake data from a small
> >> seismic network. All the stations were initially working very well. But
> in
> >> recent, after repairing one of the seismic station ABI, the P and S
> phase
> >> picks on this station shows very bad result.
> >> When I remove this station and consider others the result are of-course
> >> good, but I am not able to resolve why after introducing this station
> the
> >> errors abruptly increase.
> >> I am attaching the result of both, ABI station included and when not
> >> included.
> >>
> >>
> >> Kindly help me on this matter.
> >>
> >> [image: Inline image 2]
> >>
> >> [image: Inline image 3]
> >>
> >> Regards
> >>
> >> *SANJAY SINGH NEGI *
> >> *Senior Research Fellow(SRF)*
> >> *Wadia Institute of Himalayan Geology*
> >> *33 - GMS Road,*
> >> *Dehradun.*
> >> *Mob no.- +91-9536145596 <%2B91-9536145596>*
> >>
> >> _______________________________________________
> >> seisan mailing list
> >> [email protected]
> >> http://mailman.uib.no/listinfo/seisan
> >>
> >>
> >
> >
> > --
> > *Paul Friberg*
> > -------------------
> > *CEO/Seismologist*
> > *ISTI* == Instrumental Software Technologies, Inc.
> > *Geophysical Services and Software*
> >
> > _______________________________________________
> > seisan mailing list
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> >
> >
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