Hi Jon -

One other thought to keep in mind.  The passband on your instrument is =
4.5
hz.  This is in the range of short period seismometers that are =
displayed.
I don't know what filtering is used on the displays you have access to =
in
Iceland, but there may be significant differences in what you see from =
your
instrument and what is displayed due to filtering unless you are looking =
at
short period information.

For example the displays of the STS-1 run by the University of Arizona =
are
as follows:

	http://saso.geo.arizona.edu/saso/Earthquakes/Current/tuc_nf.html
	http://saso.geo.arizona.edu/saso/Earthquakes/Current/tuc_lp.html
	http://saso.geo.arizona.edu/saso/Earthquakes/Current/tuc_sp.html

	Broadband		No Filter
	Long Period		0.011 - 0.067 hz
	Short Period	1.00 - 2.00 hz

The Lamont-Daugherty Earth Observatory (LDEO), just north of New York =
City
uses the following:

	http://www.ldeo.columbia.edu/cgi-bin/LCSN/WebSeis/24hr_heli.pl

	Broadband		No Filter
	Long Period		0.003 - .1 hz
	Short Period	0.6 - 5.0 hz

The displays from IU Network - Albuquerque Seismological Laboratory =
(ASL)
are all long period and filtered at 0.02 hz

	http://aslwww.cr.usgs.gov/Seismic_Data/heli2.shtml

You can see significant differences in the displays of short period, =
long
period and broadband at the University of Arizona, and LDEO.

Cheers

Bob Hancock

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of jonfr500@.........
Sent: Sunday, December 10, 2006 18:26
To: psn-l@..............
Subject: Re: Low period noise

Hi

This might be storms, there is at the moment a low pressure system =
somewhere
south of Iceland.

This actually creates small wave forms in my plot, on the computer =
screen.
But it doesn't show on the online plot.

Regards.
J=F3n Fr=EDmann.
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