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40m Log |
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Tue Oct 8 08:08:18 2019, gautam, Update, PEM, PEM BLRMS anomaly
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Wed Oct 23 11:49:21 2019, gautam, Update, PEM, PEM BLRMS anomaly 
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Thu Oct 24 18:37:15 2019, gautam, Update, PEM, T240 checkout
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Tue Nov 5 12:37:50 2019, gautam, Update, PEM, T240 interface unit pulled out 
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Wed Nov 13 19:34:45 2019, gautam, Update, PEM, Follow-up on seismometer discussion 
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Wed Nov 13 20:15:56 2019, rana, Update, PEM, Follow-up on seismometer discussion
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Wed Nov 13 23:40:15 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Thu Nov 14 12:11:04 2019, rana, Update, PEM, Follow-up on seismometer discussion
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Fri Nov 15 00:18:41 2019, rana, Update, PEM, Follow-up on seismometer discussion
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Fri Nov 15 12:16:48 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Mon Nov 18 14:32:53 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Tue Nov 19 21:53:57 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Message ID: 15025
Entry time: Thu Nov 14 12:11:04 2019
In reply to: 15024
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Author: |
rana |
Type: |
Update |
Category: |
PEM |
Subject: |
Follow-up on seismometer discussion |
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at 1 Hz' this effect is not large so that's real translation. at lower frequencies a ground tilt couples to the horizontal sensors at first order and so the apparent signal is amplified by the double integral. drawing a free body diagram u can c that
x_apparent = (g / s^2) * theta
but for vortical this not tru because it already measures the full free fall and the tilt only shows up at 2nd order |