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| groups:homestake:meetings:20171208 [2017/12/08 12:17] – mandic | groups:homestake:meetings:20171208 [2017/12/08 13:19] (current) – mandic | ||
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| Homestake Meeting Minutes, 12/08/17 | Homestake Meeting Minutes, 12/08/17 | ||
| - | Attending: Andrew, Jan, Pat, Ross, Vuk, Daniel, Michael | + | Attending: Andrew, Jan, Pat, Ross, Vuk, Daniel, Michael, Gary |
| Agenda: | Agenda: | ||
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| * Leads: Jan, Michael | * Leads: Jan, Michael | ||
| * Latest version: {{: | * Latest version: {{: | ||
| - | * Vuk: | + | * Vuk: Why can't you measure seismic speed below 1.2 Hz. |
| + | * Jan: Not clear, the method should work, it looks like there is a lot of variability around 1Hz, potentially different wave modes. | ||
| + | * New point in the paper: evidence of the presence of body waves at 0.2 Hz, based on the speed measurement. Body waves seem to dominate on some days. In fact, it seems there is a continuous body wave background and on some weeks a stronger Rayleigh background overcomes it. Important for GW detectors. | ||
| + | * Vuk: suggest to emphasize this to Victor and Gary via email, their response could help place this result in existing geo literature. ALso suggest to plot Fig 6 as a scatter plot, which should appear as -45 degree line. | ||
| + | * Daniel: where would body waves come from? | ||
| + | * Jan: not sure. | ||
| + | * Jan: also have very good Wiener subtraction. Should we try a more visible journal, like Nature geophysics? | ||
| + | * Vuk: worth considering, | ||
| + | * Jan: correct, could try another array like Sweatwater. | ||
| + | * Vuk: Could we use an estimate of Rayleigh wave speed from elsewhere? And plot lambda/4 on the Figure 5. | ||
| + | * Ross/Pat: could try to estimate the speed from mining blast data. Pat working on this now, Ross did a study in the past. | ||
| + | * Jan: Could use shear wave speed, which was measured, and convert based on some assumption on the poisson ratio. This could be a value for now, that could be updated later from other analyses. | ||
| + | * Gary: could use the mine blasts. Have very solid data on shear wave speed from the active excitation at 2000. But this is on the scale 10-100m, but don't know it at a larger scale, but wouldn' | ||
| + | * Jan will send an email summarizing these results. We should discuss how to proceed via email, if necessary we'll schedule another call before the winter break... | ||
| * Teleseismic EQs and near-surface scattering | * Teleseismic EQs and near-surface scattering | ||