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Entry  Fri Feb 10 02:35:29 2012, kiwamu, Update, IOO, crazy ground motion MCunlock.png
    Reply  Fri Feb 10 11:01:31 2012, steve, Update, IOO, crazy ground motion seism1davg.png
       Reply  Fri Feb 10 11:46:44 2012, steve, Update, IOO, seismic noise back to normal seism4h.pngseis60s.pngoneday.png
          Reply  Fri Feb 10 15:47:38 2012, rana, Update, PEM, seismic noise back to normal 
             Reply  Fri Feb 10 15:52:35 2012, Jenne, Update, PEM, seismic BLRMS loud too 
                Reply  Fri Feb 10 23:58:30 2012, rana, Update, PEM, seismic BLRMS loud too 
                   Reply  Mon Feb 13 11:30:51 2012, Jenne, Update, PEM, seismic BLRMS loud too 
                      Reply  Mon Feb 13 12:02:17 2012, Koji, Update, PEM, seismic BLRMS loud too 
    Reply  Fri Feb 10 23:19:09 2012, kiwamu, Update, IOO, cross talk causing fake seimometer signals 
Message ID: 6272     Entry time: Fri Feb 10 15:52:35 2012     In reply to: 6271     Reply to this: 6275
Author: Jenne 
Type: Update 
Category: PEM 
Subject: seismic BLRMS loud too 

Quote:

 

 Kiwamu and Steve maybe don't know about how to trend seismic noise. If you just take the mean of the time series, you don't prove that the seismic noise got any higher. The STS has a nominally zero DC output, so the long period level shifts that you see tell you just that there was a DC offset.

This is NOT an increase in seismic noise. To see a seismic trend you should plot the trend of the BLRMS channels that we made especially for this purpose.

 So, none of our PEM BLRMS channels are recorded as of right now.  All we have for long-term record is the StripTool on the wall.  The 0.1-0.3Hz and 0.3-1 Hz traces both show these weirdo things, but the 1Hz and up BLRMS don't have any unusual noise.

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