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Homestake Meeting Minutes, 12/03/15

Attending: Gary, Victor, Michael, Levi, Vuk, Daniel, Pat, Tanner

Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home

Our agenda:

1) Homestake array status Tanner: DQ shift this week. Still having problems with Ross, masses are misbehaving and also having data dropouts. The data is not good. Should check on the power levels at this station. Lost contact with 4850C station yesterday, down for more than 12 hours now (it is still not back). This is probably due to the test blasts going on there this week. Did not see any sign of battery draining prior to the drop out. Should follow up with Jaret - Tanner will do it.

Gary: Noticed that Yates is acting up (Guralp), showing spikes in all 3 components. Got advice to lock and unlock the seismometer, and this cleared it up. The data was probably usable before the fix, but noisier.

Gary: should recenter 300, another Guralp.

Tanner: Also E2000 and WTP should be re-centered.

Gary: WTP has little dirt on the top, this could be the problem.

Gary: the new 2000E location seems to be perfect, don't see many tilt events at all.

- calibration efforts Gary: Calibration procedure worked mostly. Intended to post the results, but did not have a chance to do it yet. Results are in the form of figures, shown as the phase and amplitude spectra, measured vs nominal for each sensor. All STS-2 sensors are indistinguishable from the specs, so the calibrations are within the error from the nominal for all STS-2 stations. But there were problems with Guralps: We were running an older version of the software which had a bug when dealing with Guralps. So the calibration did not work for Guralps. This put Ross into an unusable state - this has happened before in other projects, and the fix that sometimes worked was to cycle the power at the site - this could be done from the doghouse, we don't have to open the vault.

The Guralps are at Yates, Ross, Deadwood, and 300 - we don't have the calibration for these. We should calibrate these when we visit next.

- do we need to plan a visit in Jan/Feb? Vuk: We have only one issue, the Ross, which is not a critical station. Maybe someone at Homestake could do this for us. Vuk will follow up on this.

Gary: Another issue is that the balers may be filling up. Can we find out how much data is on them? Tanner will try to follow up on this.

2) data analysis updates