PSN-L Email List Message

Subject: Long Frequency noise?
From: "Ted Channel" tchannel@............
Date: Wed, 23 Dec 2009 18:59:44 -0700


Hi Folks,  I just recorded the 6.3M Primor'ye Russia,  on three sensors, =
a Lehman, a Vertical and a new horz I call ch 2.

The Ch 2 sensor is new, and has a period of 22 second, horz pendulum =
like a Lehman.   This new sensor has always had (long period noise)?  =
FFT...... This was the first earthquake I have received since I =
installed it.   I normally filter 1 for low pass, .05 for high =
pass................This time I had to use 1 for low pass and .5 for =
high pass, to clean it up.

I can send all three .psn files, all unfiltered, if you think you can =
tell me what is causing the noise.    I won't try to go into great =
detail here.   All three sensor recorded it clearly buy something is not =
right.








Hi Folks,  I just recorded the = 6.3M Primor'ye=20 Russia,  on three sensors, a Lehman, a Vertical and a new horz I = call ch=20 2.
 
The Ch 2 sensor is new, and has a = period of 22=20 second, horz pendulum like a Lehman.   This new sensor has = always had=20 (long period noise)?  FFT...... This was the first earthquake = I have=20 received since I installed it.   I normally filter 1 for low = pass, .05=20 for high pass................This time I had to use 1 for low pass and = ..5 for=20 high pass, to clean it up.
 
I can send all three .psn files, all = unfiltered, if=20 you think you can tell me what is causing the noise.    I = won't=20 try to go into great detail here.   All three sensor recorded = it=20 clearly buy something is not right.
 
Thanks, Ted

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