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.

Keep up the good work,  Jim Lehman
----- Original Message ----- 
From: "Steinar Midtskogen" 
To: 
Sent: Saturday, March 12, 2011 1:01 PM
Subject: Lehman seismometer movement


> My SEP seismometer (Lehman type) went off the scale for two hours
> during the Japan quake.  I'm 8200 km away.  I had a look at the
> instrument while this while going on and I'm pretty sure that I could
> see the weight moving, very slowly.  I approached it as slowly as I
> could and stopped a meter away from it so I wouldn't disturb it, and
> watched for a few minutes.  It seemed to move irregularly, not just
> swinging back and forth.
>
> Does this sound plausible or was I simply imagining this?
>
> Also, I'm pretty impressed with my 4.5 Hz geophones.  Even with a 0.01
> Hz (100s) lowpass filter the S wave shows up beautifully.  The data
> from the Lehman seismomter are not very useful for analysis as the
> data are heavily clipped.
>
> -- 
> Steinar
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