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Homestake Meeting Minutes, 04/13/18

Attending: Gary, Pat, Victor, Vuk, Daniel


  • Next Meeting: May 11
  • Data analysis topics
    • Data corrections, frame production (Gary/Daniel/Pat)
    • Event catalog (Gary/Ross)
      • Pat: eigenfunctions measured above 0.2 Hz, not much signal below it. Gary agrees.
      • Vuk: Correction of equation on slide 6.
      • Daniel: for data points where there is a binary distribution (some retro and some pro), should we try to force the retro solution? This could change the mean and the median.
      • Pat: not sure, had the same question. Will follow up via email.
      • Victor/Daniel: if v(f) is a power law, then the coefficients of the biexponential eigenfunctions are independent of frequency.
      • Pat: velocity at low frequencies is maybe not modelled well with a linear or a power law. Maybe there are better choices?
      • Victor: usually people don't fit velocity vs frequency with a parametrized curve, instead they use their data (or don't use some frequencies).
      • Victor/Pat: could try to fix velocities from other estimates, and only estimate other parameters
      • Vuk: it seems posteriors and priors are similar, not constraining the eigenfunctions more than we already did before the measurements.
      • Victor: yes, the paper could simply state that the data is consistent with the model.
      • Vuk: Maybe we can get away with some simpler statistical statement, showing that the model is consistent with the data?
      • Victor: would be nice, but would not be the selling point of the paper.
      • Vuk: let's then proceed with what we have. If we come up with a simple statistical test we can add it…
    • 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:
      • Leads: Vuk, Gary, Victor
      • Submitted to Seism. Research Lett.: Still waiting. Vuk to check with the editor…
  • Active excitation overview paper
    • Leads: Gary, Ross
    • Others: Victor, Daniel,…
  • 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
  • Estimating directional and modal composition of the seismic noise. (Pat, Levi, Vuk)
    • Leads: Pat, Vuk, Levi
  • Wiener filter application
    • Leads: Jan, Michael
    • Latest version: Draft.
    • Michael: draft produced after discussing with Victor. Will iterate again to make it more suitable for geophysics community. Moved text around to emphasize geo aspects more. Target: Journal of Geophysical Research: Solid Earth. Physics implications are in the conclusion only.
    • Victor: this is the standard journal for geophysics research, so the emphasis should be on geophysics. It is OK to add on implications for physics.
  • Teleseismic EQs and near-surface scattering
    • Leads: Daniel, Victor
  • Time-variable velocity changes
    • Lead: Victor, not started yet
  • Very low frequency harmonics (Ross)
  • 3D PDF of Homestake geometry - draft for active source experiment paper homestakeexperiment.pdf
groups/homestake/meetings/20180413.txt · Last modified: 2018/04/13 13:06 by mandic