PSN-L Email List Message

Subject: Re: 8 second Microseisms
From: "Mauro Mariotti" mariotti@.........
Date: Thu, 30 May 2002 18:50:19 +0200

the best way to identify a strange signal is to transform some hours
of recording in audio wav files.
Arie Verveer should have a tool to be used with SDR.
Interesting result are came out listening background noise.
See the topic of phonoseismology on my web siter



----- Original Message -----
From: "Stephen & Kathy" 
To: "PSN-list" 
Sent: Thursday, May 30, 2002 6:08 PM
Subject: 8 second Microseisms

> FYI,,   I noticed a strangeness in the background noise today as I was
checking my
> traces, so I did an FFT and discovered that they had a period of about 8
> seconds,,   as compared to the normal 4.5 to 5.5 that I've noticed over
the years
> for Northern California!    Anyone have any idea why????    Could this be
> by the hurricane,, or is something else going on???   I verified that it
was not
> my machine by checking with the Berkeley "make your own seismogram" link!!
> I haven't noticed such long period microseisms before,,,   perhaps I just
> looking??
>   Stephen
>   PSN Station #55
>   near Pilot Hill Ca
>   38.828N  120.979W
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