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groups:homestake:meetings:20180413

Homestake Meeting Minutes, 04/13/18

Attending: Gary, Pat, Victor, Vuk, Daniel

Agenda:

- Next Meeting: May 11
- Data analysis topics
- Data corrections, frame production (Gary/Daniel/Pat)
- Event catalog (Gary/Ross)
- Radiometer updates (Pat, Andrew) {{:groups:homestake:meetings:rwave_pe_and_radiometer.pdf|}}
- 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