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 Fri Dec 6 17:49:46 2019, rana, Summary, PEM, Jump test of seismometers: EX needs recentering 
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 Sun Dec 8 20:15:41 2019, rana, Summary, PEM, Jump test of seismometers: EX needs recentering
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Mon Dec 9 13:08:24 2019, Yehonathan, Summary, PEM, Jump test of seismometers: EX needs recentering
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Message ID: 15083
Entry time: Sun Dec 8 20:15:41 2019
In reply to: 15082
Reply to this: 15086
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| Author: |
rana |
| Type: |
Summary |
| Category: |
PEM |
| Subject: |
Jump test of seismometers: EX needs recentering |
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I have re-centered the EX (and EY) seismometers. They are Guralp CMG40-T, and have no special centering procedure except cycling the power a few times. I turned off the power on their interface box, then waited 10s before turning it back on.
The fist atm shows the comparison using data from 8-9 PM Saturday night:
- there seems to be a factor of 2 calibration diff between the T240 near the BS, and the Guralp seismometers at the end. Which one is right?
 When was the last time they were cross calibrated?
- The low coherence between BS_X and EX_X shows the problem. They should be very coherent (> 0.9) for 0.1-1 Hz.
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