I checked the recent relations between blasting for the tunnel construction and IFO unlock. All figures show the seismic noise at IXV Z and IR trans changes.
All blasting seemed to unlock the IFO.
Is it beneficial to prepare a robust but noisy control for the predicted blasting timing? The actual blasting timings seemed to be fluctuating within about 1 hour around the pre-reported timings. 1 hour is too long to waste the observation time. If the relock is faster, is it better to wait for the relock? However, alignment can also be damaged by blasting? If so, the sensitivity just after relock can be worse until ASC/BPS/ADS finds good alignment. This is also practical loss of time?
Anyway, we should report these results to the Tunnel constructors.
- Fig.1: 20250429 19:30
- Fig.2: 20250428 19:44
- Fig.3: 20250428 09:58
- Fig.4: 20250422 04:27
- Fig.5: 20250421 22:59
- Fig.6: 20250421 09:24
- Fig.7: 20250417 20:22
and blasting timing reports from the tunnel constructor (excel files).
