Jeff K., Krishna V.

I analyzed the data from the T240 (labeled as STS atm) on the ground (about ~ 1 m away) and have attached three plots.

To make them I used 7k seconds of tiltmeter and T240 data from Tuesday night, roughly between 9:10 PM to 11:10 PM. I resampled both data sets to 1 Hz to get them on the same time base. Then I compared the phase of the T240 signal (converted to acceleration) against the tiltmeter signal in 10-100 mHz range and time shifted them until the phase lined up, as shown in the second figure.

I've also shown the residual, obtained by subtracting the time series of the two signals. We are limited by being on different clocks and DAQs, but even so, the coherence is decent. Just as I saw in our lab at UW, there is good coherence when both see tilt and very little coherence when the seismometer is seeing horizontal displacement while the tiltmeter still sees tilt.
 
Edit: I've attached the data in the format: columns [time   T240*w^2/g   tiltmeter]