PSN-L Email List Message

Subject: Re: PSN - Increase in noise
From: meredith lamb psnseismograph52@..........
Date: Mon, 30 Aug 1999 12:49:59 +0000




"Rex Klopfenstein, Jr" wrote:

> I have two S-G seisms running and everything was fine.  I had the
> amplifiers adjusted to display about +/-100 counts of background noise.
> Sunday (8/29/99) I turned on the monitor on my SDR computer.  All
> channels (HI/LO on both N/S and E/W) are somewhat more noisy.  The
> average values are now about +/-300 to 400 counts.
>
> I retrieved a block of data from my N/S channel during a quiet time
> (2:00am LOCAL).  I then switched to the FFT screen and noted a peak at
> 0.12 on LOG(f) scale (x axis).  I assume that the scale is log base 10
> of frequency or 0.12 = approx 1.3 Hz??
>
> Would this increase in noise be caused by the hurricane on the East
> Coast (I am located in NW Ohio).  I remember seeing something on this
> list sometime ago, but can't remember if there was a characteristic
> frequency of this hurricane noise.
>
> If the hurricane isn't doing it, it's time for some detective work!!
>
> Any help would appreciated before I start looking for gremlins!!!
> --
> Rex Klopfentein, Jr.
> rklopfen@.........
> http://www.wcnet.org/~rklopfen
>

Rex,

Don't think anything is unusual on your end....the hurricane
microseisms are hitting me hard here too.  Need to increase
the trigger level here...probably as well there...its set it off
afew times since yesterday when it started building up with
time.

Meredith Lamb




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Larry Cochrane <cochrane@..............>