Steinar,
My SEP is fairly close to yours, and I got 9mm of movement according to my
current calibration. Theoretical movement @20sec is 6mm.

Winquake calculated a magnitude of 9.0 using unfiltered data.

So I'd say It's absolutely plausible to see this movement.
Contact me if you want my data as mine didn't saturate.

Audun

"Jim and Connie Lehman"  writes:

> Steinar--an interesting observation at 8200 km--Let's chalk it up to
> half plausible, and half imagination.  This event is a powerful
> exhibit of energy, and it will be interesting to see reports of motion
> exhibited or detected by conditions other than seismographs.

By extrapolating http://jclahr.com/science/psn/magnitude.html we
should expect about 2 cm (!) ground movement at this distance, but I
expect that this would be longer periods than what my Lehman was
designed for.

While my observation might be plausible I'm actually more impressed
with what I saw on my 4.5 Hz geophones.  Here's what I get if I apply
a 1 Hz lowpass filter to the N-S geophone:

http://voksenlia.net/nytt/2011/jordskjelv-20110311.jpg

And here's the raw unfiltered seismometer plot:

http://voksenlia.net/nytt/2011/jordskjelv-20110311b.jpg

It's badly clipped, so it's less useful to study.

--
Steinar
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