From: Kurt Feigl, Toulouse Date: 3 Mar 1995 0:01:39 Subject: [SCIGN-0051] blind test ****************************************************************************** SCIGN Electronic Mail Fri Mar 3 0:01:39 PST 1995 Message Number 0051 ****************************************************************************** Author: Kurt Feigl, Toulouse Subject: blind test In response to Keith Stark's message: > On February 23rd, site personnel at UCLA were working with the > monumentation at UCLP which may have inadvertently caused the antenna to be > displaced as much as a few centimeters. We aplogize for not getting out a > message earlier, but we were not notified of this change until this > morning. I am distressed that he had to be notified. This sort of signal should be detected by the network itself. I would suggest a *blind test*. I challenge the various processing groups to analyse this day's data sequentially to determine *when* the movement occurred, and its magnitude. If GPS is going to be useful for ultra-long period seismology on scales of hours, it will have to break the habit of one solution per day.... Playing the devil's advocate, Kurt ************************************************************** * Kurt Feigl Observatoire Midi Pyrenees * * office: (33) 61 33 29 40 14, Ave. Edouard Belin * * fax (33) 61 25 32 05 31400 TOULOUSE * * E-mail: feigl@medoc.cnes.fr FRANCE (air mail!) * ************************************************************** [Mailed From: Kurt FEIGL ]