Hi Jon,

That's what I'm hoping someone knows more about than I do.  I posted a gif=
=20
image of what we were seeing at:

http://bnordgren.org/seismo/090929.215813.bhz-ph.psn.gif

The peak amplitude appears to be about 1um/s.  Since at 180 seconds the 50=
=20
sec. instrument response is down by a factor of roughly 13, the actual peak=
=20
ground velocity must have been somewhere around 13um/sec implying a peak=20
displacement of about 0.37 mm.

Brett



At 12:44 AM 9/30/2009 +0000, you wrote:
>Hi,
>
>What was the signal that you where seeing ?
>
>Regards,
>J=F3n Fr=EDmann.
>
> > Hi all,
> >
> > As the Samoa quake was winding down, at about 23:04 UCT on the 50 sec
> > vertical we see a very clear ~180 second signal that lasts for about=
 half
> > an hour.  On the Trillium 120 Z channel it's much bigger.  What's going
> > on?  Is that what I think it is?
> >
> > Brett
> >

Watch our wiggles
http://bnordgren.org/seismo/gif_images.htm

or watch some very very good wiggles
http://aslwww.cr.usgs.gov/Seismic_Data/telemetry_data/ANMO_24hr.html


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)