Homestake Meeting Minutes, 10/18/17
Attending: Daniel, Ross, Pat, Andrew, Vuk, Michael
Agenda:
- Next Meeting: Vuk will circulate doodle poll, it seems there are conflicts with current time.
- Data analysis topics
- Data corrections, frame production (Gary/Daniel/Pat)
- Has data in IRIS been updated? Check with Gary?
- Event catalog (Gary/Ross)
- Radiometer updates (Pat, Andrew)
- looking at the transverse to vertical phase, to find the Rayleigh wave (90 degree phase).
- tried to run the radiometer on the data around 1.5 Hz, which seems to be coming from a direction about 68 degrees east of north. Find that radiometer gives 22 degrees north of east, which seems consistent. Some concerns: the data at this frequency has periodic turn ons/offs, so it may be local, in which case the waves would not be plane waves.
- Looked at earthquakes too, but not ready to present.
- Plan to present at the next meeting, will try to have some slides with applications to different data.
- Parameter estimation for Rayleigh and Love (Pat)
- Teleseismic events and Wiener filtering (Daniel, Michael)
- Very-long-periods (Ross)
- Circulated a figure comparing power in Homestake and Pinon flat arrays. Up to 1000x better noise in the Homestake array at 2mHz, depending on the frequency.
- Will use this for the methods paper, didn't see the very long periods in the Pinon Flats. Will use to demonstrate why Homestake data can reveal these periods.
- Method paper is nearly done, will also write a results paper
- 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
- target: Seism. Research Lett., 6000 words, 10 figures.
- Paper should be in a very mature state. Vuk will take another look, check emails from Gary, and if there are no issues will submit.
- 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
- Michael with check with Jan, there may be more work to be done on it before circulation.
- Teleseismic EQs and near-surface scattering
- Leads: Daniel, Victor
- Time-variable velocity changes
- Lead: Victor, not started yet
- Very low frequency harmonics (Ross)