Subject: Re: [ids.analysis.forum] IDS-ITRF2004: station discontinuities
From: Jean-Jacques Valette <[email-masked]>
To: [email-masked]
Date: Mon, 13 Jun 2005 14:13:01 +0200

Dear Martine, dear colleagues,

In order to help in finding correlations between DORIS breaks and 
sismicity, a tool has been developed to extract from the usgs earthquakes 
database those who had occurred in the vicinity of a DORIS site.

You may find, in the IDS Central Bureau ftp site, three files that give
the list of earthquakes following the criteria:
- magnitude higher than 6 within 3000 km (1997-up ot now)
- magnitude higher than 5 within 1000 km (1997-up to now)
- magnitude higher than 3 within 100 km (1998-2004)
Updates between 1992-1997 will be done soon.

ftp://ftp.cls.fr/pub/ids/stations/earthquakes/

Hereafter are the comparison with the "DORIS breaks" listed in your report 
or previously by Pascal, John, Laurent and other analysts.

****************************************************
      date    mag   lat   long  StatId  Dist(km)
****************************************************

  COLA (7N,80E) 16/11/1999
-------------------------
   11/11/1999 6.2   1.28  100.32 COLA  2353
   15/11/1999 6.3  -1.34   88.98 COLA  1365

  KRAB (56N,92E) 1/1999 - 01/2000
--------------------------------
   31/ 5/2000 5.0  51.69  104.94 KRAB   928
   27/10/2000 5.7  54.71   94.98 KRAB   198
   27/ 9/2003 7.3  50.04   87.81 KRAB   741

  SAKA (47N,142E)  10/10/1994 & 25/11/2001
-----------------------------------------
(    date         mag deep lat    long
  1994/10/ 9       6.5  33  43.90  147.92
  earthquake in the database but not processed)

   28/ 1/2002 6.1  49.38  155.59 SAKA   988

  SODB 2002/10/3
---------------
    3/10/2002 6.5  23.32  251.47 SODB   569

  FAIB 3/11/2002
---------------
    3/11/2002 7.9  63.52  212.56 FAIB   161

  AREA 23/06/2001
----------------
   23/ 6/2001 8.4 -16.26  286.36 AREA   230
   23/ 6/2001 6.1 -17.18  287.36 AREA   145
   26/ 6/2001 6.7 -17.75  288.35 AREA   143
    7/ 7/2001 7.6 -17.54  287.92 AREA   134

  EASB  12/02/1998
-----------------
   31/ 1/1998 6.0 -35.76  262.94 EASA  1510
   12/ 2/1998 5.1 -27.40  250.12 EASA    56

Hoping it will help.

Best regards,

JJ Valette

At 15:01 10/06/2005 +0200, you wrote:
>Dear colleagues
>
>To help the dicussion of the IDS contribution to ITRF2004, we have set up
>a web page http://lareg.ensg.ign.fr/IDS/ITRF2004.html that gives access to
>a number of plots and analyses of the time series of DORIS coordinates.
>
>The first aspect we propose for convergence of opinions is the list of
>station discontinuities.
>
>PROPOSED EXTENDED LIST OF DISCONTINUITIES
>
>The list of discontinuities agreed upon by the three Analysis Centers for
>their ITRF2004 submissions is available at
>http://lareg.ensg.ign.fr/IDS/ITRF2004/discont.html
>
>An additional list of station discontinuities is under discussion in June
>2005. These  discontinuities that were discussed between ign and lca are
>listed hereafter, with the Analysis Coordinator (ac) comments and a final
>proposal, using the discontinuity qualifier proposed by R. Ferland.
>P: position change; V: velocity change.
>
>For some proposed discontinuities in the case of a nearby earthquake, we
>propose to wait until the expected effect is known. There are ongoing
>studies on this problem.
>
>---------------------------------------------------------------------------------
>Sta    Event        Date    Type   Recommendations & Comments
>                                    ign lca    ac
>---------------------------------------------------------------------------------
>COLA Restart     01 Jul 2001   P   yes  yes  YES
>EASA Earthquake? 12 Feb 1998   V   yes  yes?  NO  Wait for effect evaluation
>EVEB Restart     01 Jan 1997   P   yes  yes  YES
>EVEB Restart     01 Jan 2003   P   yes  yes  YES
>FAIA             01 Jan 1996   V   yes? yes   NO  Wait for effect evaluation
>FAIB Noisier in 2nd part of 2002     -   -    NO
>KESB Restart     01 Jul 2004   P   yes  yes   NO  Wait for more data
>KRAB Restart     01 Jan 2000   P   yes   no   NO  Non linear motion mostly 
>annual
>MARB Restart     01 Apr 2003   P   yes  yes  YES
>ROTA             ~ 1996-1997   V    ?   yes   NO  Up motion non linear but 
>smooth
>STJB Restart     01 Sep 2002   V   yes  yes   NO  No obvious date for a change
>TRIB Earthquake? 31 Jul 2004   P   yes   ?    NO  Wait for more data
>---------------------------------------------------------------------------------
>
>The above table is available at
>http://lareg.ensg.ign.fr/IDS/ITRF2004/discont.html#p2, which
>provides links to plots of the station motions measured by ign and lca
>and to plots of coordinate residuals for ign, ina, and lca prepared by the
>Analysis Coordinator Team.
>
>The topic of our next proposal will be the selection of a core network
>suitable to best insure the long term consistency of the IDS
>contribution.
>
>Looking forward to your inputs
>
>The IDS Analysis Coordination team
>Martine Feissel-Vernier     Karine Le Bail    Jean-Jacques Valette
>
>
>
>
>
>
>
>
>
>
>

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