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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