Because of a small number of earthquakes, over 18 hours of continuous locking was realized.
However, the lock loss seemed not to be related to seismic noise shock.
After this long lock, the BNS range seems to be sometimes degraded during locking. It is better to check the IFO conditions, especially those related to ASC and/or signal saturation. Some excess noise was visible around 60 Hz to 100 Hz.
