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Entry  Wed Aug 22 18:58:12 2012, Jenne, Update, PEM, Weird BLRMS increase 10x
    Reply  Thu Aug 23 00:18:54 2012, Jenne, Update, PEM, Weird BLRMS increase BS_OSEMsensors_higherFreqPeakIsOlder_LowerFreqPeakIsMoreRecent.pdf
    Reply  Thu Aug 23 10:08:13 2012, Steve, Update, PEM, seismometers? bajaMag3.pngseisvssus.png
Message ID: 7251     Entry time: Wed Aug 22 18:58:12 2012     Reply to this: 7253   7254
Author: Jenne 
Type: Update 
Category: PEM 
Subject: Weird BLRMS increase 

It seems as though there is something funny going on around ~1.5 Hz, starting a little over an hour ago.

We see it in the BLRMS channels, the raw seismometer time series, as well as in various suspensions and LSC control signals.  It's also pretty easy to see on the camera views of all the spots (MC, arms, transmissions....AS is a little harder to tell since it's flashing, but it's there too).

The plots I'm attaching are only for ~10min after the jump happened, but there has been no change in the BLRMS since it started.  Usually, we'd see an earthquake in all the channels, and even big ones ring down after a little while.  This is concentrated at a pretty narrow frequency (some of Den's plots for later have this peak), and it's not ringing down, so it's not clear what is going on.

Here is a whole pile of plots.  Recall that the T-240 is plugged into the "STS_3" channels, and we don't have BLRMS for it, so you can look at the time series, but not any frequency specific stuff.

Attachment 1: All_seis_time_series.png  32 kB  | Hide | Hide all
Attachment 2: Gur1X.png  22 kB  | Hide | Hide all
Attachment 3: Gur1Y.png  23 kB  | Hide | Hide all
Attachment 4: Gur1Z.png  21 kB  | Hide | Hide all
Attachment 5: Gur2X.png  24 kB  | Hide | Hide all
Attachment 6: Gur2Y.png  23 kB  | Hide | Hide all
Attachment 7: Gur2Z.png  22 kB  | Hide | Hide all
Attachment 8: STS1X.png  25 kB  | Hide | Hide all
Attachment 9: STS1Y.png  25 kB  | Hide | Hide all
Attachment 10: STS1Z.png  26 kB  | Hide | Hide all
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