Commisioners have reported excess pitch motion in ITMX for the past few nights. The plot attached shows the Optical lever motion (Top left is ASD, bottom left is RMS) , and the ground motion (Top right is ASD, bottom right is RMS). Measurement are taken every morning at 1am on Sunday (Red), Monday (Blue), Tuesday (Green), Wednesday (Brown) and Thursday (Magenta).

The numbers below show that the pitch motion has varied by as much as a factor of 5 from one night to another, but it is not necessarily directly correlated with the amplitude of the ground motion (worst pitch motion was yesterday though the mircro-seism was not higher than during the previous nights).

- Optical Lever RMS motion at 100 mHz, Sunday through Thursday at 1 am PT:

18 nRad / 44nRad / 63nRad / 42nRad / 100 Rad

- Ground instruments RMS motion at 100 mHz in nm/s (must check the units, but it's fair to compare the day to day relative motion), Sunday through Thursday at 1 am PT:

113  / 106 /  197 / 189 / 140

- Ratio in nRad/(nm/s):

0.16   0.41   0.32  0.22   0.71