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Entry  Wed Nov 28 23:18:35 2012, Charles, Update, PEM, Decreased RMS in Seismometers 8-31_11-29_PEM-RMS.jpg
    Reply  Thu Nov 29 02:43:48 2012, Ayaka, Update, PEM, Decreased RMS in Seismometers GUR1Xfilterbank.pngseismometers1129.jpgseismometers1129.pdf
       Reply  Thu Nov 29 09:58:06 2012, Den, Update, PEM, Decreased RMS in Seismometers 
          Reply  Tue Jan 29 14:34:42 2013, Jenne, Update, PEM, Secret Seis filters  
Message ID: 7762     Entry time: Thu Nov 29 02:43:48 2012     In reply to: 7759     Reply to this: 7763
Author: Ayaka 
Type: Update 
Category: PEM 
Subject: Decreased RMS in Seismometers 


The attached plots display RMS noise from various accelerometers and seismometers over the past 90 days. One can see how after the reinstallation of the seismometers in November, RMS from the GUR1Z and GUR1X channels decreases by a factor of about 100 from data in August. Additionally, the RMS over the course of the last 90 days has notably decreased in all instruments. In many cases, the RMS is only the result of inherent electronics noise, rather than from a signal.

The Image is replaced

[Den, Ayaka]

We found that seismometer was working and the calibration in the filter banks should have been wrong.
We turned off the all FM2 filter in RMS filter banks.

We also installed STS seismometer. It is under the BS. Now we have spectrum of three seismometers.


RA: the above plot is kind of unreadable and useless. Please replace with something legible and put in some words about why there is a wrong filter, what exactly it is, etc., etc. etc. And why would you leave in a filter which is not supposed to be on? We might as well leave a few secretly broken chairs in the control room...

Attachment 2: seismometers1129.jpg  98 kB  | Hide | Hide all
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