PSN-L Email List Message
Subject: Re: Long Frequency noise?
From: chrisatupw@.......
Date: Thu, 24 Dec 2009 08:51:50 EST
In a message dated 24/12/2009, tchannel@............ writes:
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.
Hi Ted,
I will have a look if you like. What is the construction of Ch 2,
please?
Regards,
Chris Chapman
In a message dated 24/12/2009, tchannel@............ writes:
Hi Folks, I just recorded the 6.3=
M=20
Primor'ye Russia, on three sensors, a Lehman, a Vertical and a new=
horz=20
I call ch 2.
The Ch 2 sensor is new, and has a perio=
d of 22=20
second, horz pendulum like a Lehman. This new sensor has alw=
ays=20
had (long period noise)? FFT...... This was the first earthqu=
ake I=20
have received since I installed it. I normally filter 1 for=
low=20
pass, .05 for high pass................This time I had to use 1 for low=
pass=20
and .5 for high pass, to clean it up.
I can send all three .psn files, all un=
filtered,=20
if you think you can tell me what is causing the=20
noise.
Hi Ted,
I will have a look if you like. What is the=
=20
construction of Ch 2, please?
Regards,
Chris Chapman
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