Jan D. Marshall
WB7COX
Nampa, Idaho
jandmarshall@............
www.cableone.net/jandmarshall

----- Original Message -----
From: "Karl Cunningham" 
To: 
Sent: Thursday, May 30, 2002 9:28 PM
Subject: Re: 8 second Microseisms


Stephen --

I'm seeing the same thing in Southern California, and it has
increased
substantially this afternoon.  See
http://www.keckec.com/images/current.kc1.gif

The amplitude is quite large too.  There are two storm systems
off Baja
California (one off northern Baja and the other southwest of the
tip) that
I suspect are responsible.  Tropical storms and hurricanes
(usually later
in the season) are often responsible for large background noise,
even when
they are 1500 miles away.

Karl Cunningham



--On Thursday, May 30, 2002 09:08 -0700 Stephen & Kathy

wrote:

> 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 caused 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!!
>
> http://quake.geo.berkeley.edu/bdsn/make_seismogram.html
>
> I haven't noticed such long period microseisms before,,,
perhaps I just
> wasn't looking??

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