After Kate, Diego and I moved the seismometers to the corner for a huddle test (see elog 10711), I wanted to check the coherence between the seismometers and the arm transmissions.
First of all, it looks like either the Guralp or the T-240 have their X and Y backwards. Diego is going to check this tomorrow.
Between 0.9Hz - 3.5Hz, we have pretty strong coherence with the horizontal seismic channels. Interestingly, between 8-10Hz, the Yarm has pretty strong coherence with the Z-axes of the seismometers (the coherence is only about 0.6, but it's consistent over a 2-ish Hz wide band).
The MC transmission doesn't have as much coherence with the seismic, which surprised me. So, we can try some FF to the MC, but we may also have to do some to the arms.