PSN-L Email List Message
Subject: Lehman seismometer movement
From: Steinar Midtskogen steinar@.............
Date: Sat, 12 Mar 2011 19:01:39 +0100
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
__________________________________________________________
Public Seismic Network Mailing List (PSNLIST)
To leave this list email PSNLIST-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.
[ Top ]
[ Back ]
[ Home Page ]