PSN-L Email List Message
Subject: New Noise
From: tchannel1@............
Date: Tue, 2 Sep 2008 07:09:05 -0600
Hi Folks, This a.m. I checked my sensor screen and found my Lehman, at =
20 seconds, was recording some kind of noise. At first I thought it =
looked like the long freqs. from a distant earthquake. However, they =
built up over a 5 hour period, all in the quiet time of last night. My =
other two short period sensors showed nothing. I looked of an =
earthquake, but found nothing to attribute this to.
We are having a cold front move through. On the screen the noise looks =
like the letter W or small w's and it started small and has been =
building over five hours. I copied a one hour trace and looked at the =
FFT, it showed a lot of data starting at 10 seconds through 30 seconds. =
Again this is the same sort of data I would receive after a large =
distant earthquake which would record for maybe two hours.
This a.m. the long freq. are still being recorded. We have no wind, no =
rain, no great moving clouds, just overcast and in the 40's. It should =
warm up 70?
I am guessing it is weather, cold front? What else? Could it be the =
hurricans 2500 miles to the S.E.?
Hi Folks, This a.m. I checked my =
sensor=20
screen and found my Lehman, at 20 seconds, was recording some kind of=20
noise. At first I thought it looked like the long freqs. from a =
distant=20
earthquake. However, they built up over a 5 hour period, all in =
the quiet=20
time of last night. My other two short period sensors showed=20
nothing. I looked of an earthquake, but found nothing to =
attribute=20
this to.
We are having a cold front move=20
through. On the screen the noise looks like the letter W or =
small=20
w's and it started small and has been building over five=20
hours. I copied a one hour trace and looked at the =
FFT, it=20
showed a lot of data starting at 10 seconds through 30 =
seconds. =20
Again this is the same sort of data I would receive after a large =
distant=20
earthquake which would record for maybe two hours.
This a.m. the long freq. are still =
being=20
recorded. We have no wind, no rain, no great moving clouds, =
just=20
overcast and in the 40's. It should warm up 70?
I am guessing it is weather, cold=20
front? What else? Could it be the =
hurricans 2500=20
miles to the S.E.?
Thanks, Ted in =
Idaho
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