Homestake Meeting Minutes, 08/24/17

Attending: Vuk, Andrew, Daniel, Ross, Victor

Agenda:

• Next Meeting: Vuk will do a doodle poll, but Wed 11am central seems good.
• Data analysis topics
  • Data corrections, frame production (Gary/Daniel/Pat)
    • Daniel: timing hiccups from last week, timing off by 1/4 of a second especially when a station is reset.
      • Daniel made a list of all times that are questionable, will try to see how this correlates with time channels. There are of order 30-40 glitches in different stations, but they may correlate with times when timing channels were known to be bad.
    • Is IRIS data updated? Daniel checked, does not look updated… Will check with Gary how to proceed.
  • Event catalog (Gary/Ross)
  • Radiometer updates (Pat, Andrew) pdf
    • Estimation of Newtonian noise at different depths, will present some of it at the LIGO-Virgo collaboration meeting next week.
  • Parameter estimation for Rayleigh and Love (Pat)
  • Teleseismic events and Wiener filtering (Daniel, Michael)
  • Very-long-periods (Ross)
  • Velocity from noise correlations (Daniel)
    • Model selection?
  • Pull together all velocity measurements to start making comparisons (all)

• Papers
  • Homestake Array Summary paper: pdf
    • Leads: Vuk, Gary, Victor
    • target: Seism. Research Lett., 6000 words, 10 figures.
    • Vuk: addressed comments from Jan, Riccardo, and LIGO internal review, should be ready for submission. Will send one last email to get Gary's approval, as he was not present today.

• Active excitation overview paper
  • Leads: Gary, Ross
  • Others: Victor, Daniel,…
  • Will discuss at the next call.

• Surface Active Excitation
  • Leads: Victor, Boise
  • Others: Gary, Ross
  • Plan to invite the Boise group to give us a presentation in Sep or Oct 2017, when they are ready with their paper.

• Underground Active Excitation:
  • Lead: Gary, Ross

• Parameter estimation for the Rayleigh and Love eigenfunctions (amplitude vs depth dependence).
  • Leads: Pat, Daniel
  • Also contributing: Victor, Vuk, Levi
  • Novel, but maybe insufficient for a publication. Could use the eigenfunction measurement for Rayleigh and assume something about Rayleigh field to make preliminary estimates of the Newtonian noise.

• Estimating directional and modal composition of the seismic noise. (Pat, Levi, Vuk)
  • Leads: Pat, Vuk, Levi

• Wiener filter application
  • Leads: Jan, Michael
  • Aim for late August.

• Teleseismic EQs and near-surface scattering
  • Leads: Daniel, Victor

• Time-variable velocity changes
  • Lead: Victor, not started yet

• Very low frequency harmonics (Ross)