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| groups:homestake:meetings:20170727 [2017/07/25 21:58] – mandic | groups:homestake:meetings:20170727 [2017/07/27 12:30] (current) – mandic | ||
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| Homestake Meeting Minutes, 07/27/17 | Homestake Meeting Minutes, 07/27/17 | ||
| - | Attending: | + | Attending: |
| Agenda: | Agenda: | ||
| - | * Next Meeting: | + | * Next Meeting: |
| * Data analysis topics | * Data analysis topics | ||
| * Data corrections, | * Data corrections, | ||
| + | * Pat: Frames ready at Caltech. | ||
| + | * Daniel: Some timing hiccups, especially when a station is reset, timing off by 1/4 of a second. Have to chase it further, may be ignorable. | ||
| + | * Don't know if IRIS updated the data yet, should check with Gary... | ||
| * Event catalog (Gary/Ross) | * Event catalog (Gary/Ross) | ||
| * Radiometer updates (Pat, Andrew) | * Radiometer updates (Pat, Andrew) | ||
| - | * Parameter estimation for Rayleigh and Love (Pat) - presentation? | + | * Parameter estimation for Rayleigh and Love (Pat) - {{: |
| + | * Velocity estimate is close to the local phase velocity, estimated using local displacements as a function of depth. | ||
| + | * Homogeneous half-space is not a good approximation, | ||
| + | * H/V ~ 1.3 - Victor: this is normal/ | ||
| * Teleseismic events and Wiener filtering (Daniel, Michael) | * Teleseismic events and Wiener filtering (Daniel, Michael) | ||
| - | | + | * Vuk: making progress, will try to present at the next meeting. |
| + | | ||
| + | * Putting a paper together. Large section written up. Expect to circulate it in a month or so. | ||
| + | * Next try to remove tides alone, see how that affects the data. | ||
| * Velocity from noise correlations (Daniel): {{: | * Velocity from noise correlations (Daniel): {{: | ||
| + | * see timing glitches at some times. | ||
| + | * Pat: seems to be related to bad timing, maybe due to network problems. | ||
| + | * Ross: may be an issue with the 800 station, had a large number of mass re-centerings. | ||
| + | * Daniel: Also see slow drifts in RRDG, know that we lost the clock in this station towards the end of the run. | ||
| + | * Find time-shift between two stations to match the waveforms, this gives the group velocity. Do it for each station pair individually, | ||
| + | * Similar to Pat's analysis, but using the noise instead of transients. | ||
| + | * Concern regarding uncertainty for station pairs that are close in horizontal plane. Maybe not seeing Rayleigh waves, will follow up on this. | ||
| + | * Results in velocity estimates and eigenfunction profiles. Can compare to Pat's approach. | ||
| + | * Vuk: Maybe we can combine these measurements with Pat's and do model selection for eigenfunctions. | ||
| + | * Victor: there are many models out there, may have to constrain them a bit before launching into it. | ||
| + | * Gary: active data may also constrain these, some of the models are definitely not supported by the data. | ||
| + | * Daniel, Ross, Gary, Pat: will try to pull together all velocity measurements to start making comparisons. Pat will send the link again. | ||
| * Papers | * Papers | ||
| Line 19: | Line 40: | ||
| * Leads: Vuk, Gary, Victor | * Leads: Vuk, Gary, Victor | ||
| * target: Seism. Research Lett., 6000 words, 10 figures. | * target: Seism. Research Lett., 6000 words, 10 figures. | ||
| + | * Gary almost done with updates in the paper. | ||
| + | * Vuk will send it for internal LIGO review when Gary is done. No objections to this plan. | ||
| * Active excitation overview paper | * Active excitation overview paper | ||
| Line 28: | Line 51: | ||
| * Leads: Victor, Boise | * Leads: Victor, Boise | ||
| * Others: Gary, Ross | * Others: Gary, Ross | ||
| - | * Victor | + | * Victor |
| + | * Vuk: it seems this would be decoupled from any papers we want to pursue. | ||
| + | * Gary/ | ||
| + | * Vuk: let's invite them to give us a presentation in a couple of months, when they are ready. | ||
| * Underground Active Excitation: | * Underground Active Excitation: | ||