[data-issues] repeating stations in db
Philip Crotwell
crotwell at seis.sc.edu
Mon Nov 16 13:18:13 PST 2009
Hi all
I have a question about the "station" entries in the database. For
example, there are 6 IU.TIXI stations from seismoquery:
NETWORK STATION STARTTIME ENDTIME LAT LON ELEVATION SITE
IU TIXI 1995-08-15 00:00:00 1997-02-10 08:20:00 +71.634100
+128.866700 40 Tiksi, Russia
IU TIXI 1997-02-10 08:20:00 1997-10-01 00:00:00 +71.634100
+128.866700 40 Tiksi, Russia
IU TIXI 1997-10-01 00:00:00 1997-10-18 00:00:00 +71.634100
+128.866700 40 Tiksi, Russia
IU TIXI 1997-10-18 00:00:00 1997-11-14 00:00:00 +71.634100
+128.866700 40 Tiksi, Russia
IU TIXI 1997-11-14 00:00:00 1997-12-15 13:00:00 +71.634100
+128.866700 40 Tiksi, Russia
IU TIXI 1997-12-15 13:00:00 2599-12-31 23:59:59 +71.634100
+128.866700 40 Tiksi, Russia
I know that here are many changes that can happen to cause channels to
close and new ones to start at a station, but is there a rule on when
a new "station" should be created? It seems weird to me to have so
many copies, especially when as far as I can tell nothing about the
station proper has changed (ie lat, lon, etc), just the effective
times. And all but 11 IU stations are duplicated at least once.
In contrast, only 3 II stations are duplicated.
Is this intentional, or is it a mistaken creation due to bad dataless
being submitted, perhaps a new station being created every time the
channels change configuration? I suppose it is not a big deal, but it
does seem confusing.
thanks,
Philip
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