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