Ted
In light of the recent discussions, the 6.3M Primor'ye =0ARussia event I re=
corded didn't contain any real surface waves. I got P, PP and S only.=20

Regards
Barry
http://www.seismicvault.com

--- On Wed, 12/23/09, Ted Channel  wrote:

From: Ted Channel 
Subject: Long Frequency noise?
To: "psn" 
Date: Wednesday, December 23, 2009, 5:59 PM

=0A=0A =0A =0A=0AHi Folks,=A0 I just recorded the 6.3M Primor'ye =0ARussia,=
=A0 on three sensors, a Lehman, a Vertical and a new horz I call ch =0A2.=
=0A=A0=0AThe Ch 2 sensor is new, and has a period of 22 =0Asecond, horz pen=
dulum like a Lehman.=A0=A0 This new sensor has always had =0A(long period n=
oise)?=A0=A0FFT...... This was the first earthquake I have =0Areceived sinc=
e I installed it.=A0=A0 I normally filter 1 for low pass, .05 =0Afor high p=
ass................This time I had to use 1 for low pass and .5 for =0Ahigh=
 pass, to clean it up.=0A=A0=0AI can send all three .psn files, all unfilte=
red, if =0Ayou think you can tell me what is causing the noise.=A0=A0=A0 I =
won't =0Atry to go into great detail here.=A0=A0 All three sensor recorded =
Ted
In light of =
the recent discussions, the 6.3M Primor'ye =
=0ARussia event I recorded didn't contain any real surface waves. I =
got P, PP and S only. 

Regards
Barry
http://www.seismicvault.com

--- On Wed, 12/23/09, Ted Channel <tchannel@............
t> wrote:

From: Ted Channel <=
tchannel@............>
Subject: Long Frequency noise?
To: "psn" &l=
t;psn-l@..............>
Date: Wednesday, December 23, 2009, 5:59 PM
=0A=0A =0A =0A=0A
Hi Folks,  I just recorded the 6.3M Primor'y=
e =0ARussia,  on three sensors, a Lehman, a Vertical and a new horz I =
call ch =0A2.
=0A
&n=
bsp;
=0A
The Ch 2 sensor is new, a=
nd has a period of 22 =0Asecond, horz pendulum like a Lehman.   T=
his new sensor has always had =0A(long period noise)?  FFT...... =
This was the first earthquake I have =0Areceived since I installed it. =
;  I normally filter 1 for low pass, .05 =0Afor high pass.............=
....This time I had to use 1 for low pass and .5 for =0Ahigh pass, to clean =
it up.
=0A
 =0A
I can send all three .psn files,=
 all unfiltered, if =0Ayou think you can tell me what is causing the noise.=
    I won't =0Atry to go into great detail here.  =
 All three sensor recorded it =0Aclearly buy something is not right.=
=0A
 
=0A
Thanks, Ted

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