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| groups:homestake:meetings:20140123 [2014/01/23 09:59] – created mandic | groups:homestake:meetings:20140123 [2014/01/23 11:20] (current) – mandic | ||
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| Meeting Minutes, 01/23/2014 | Meeting Minutes, 01/23/2014 | ||
| - | Attending: | + | Attending: |
| Homestake wiki: https:// | Homestake wiki: https:// | ||
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| 1) Homestake update | 1) Homestake update | ||
| - | 2) UMN test setup (Tanner) | + | Vuk: no news yet, trying to connect with Bryce. Will try to keep everyone informed via email. |
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| + | 2) UMN test setup | ||
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| + | Tanner: continuing to set up the prototype at UMN, connected the digitizer, the bailer, | ||
| + | and a computer to a local network switch. Can control them, see the data from the seismometer | ||
| + | etc. At the moment don't have the GPS hooked up, since the lab is in the basement. Will move to | ||
| + | a different lab with a window, with the hope that we can get the GPS signal and get the whole | ||
| + | system to work. | ||
| 3) Analysis of existing data | 3) Analysis of existing data | ||
| a) Frames/ | a) Frames/ | ||
| b) Wiener filtering (Michael, Jan) | b) Wiener filtering (Michael, Jan) | ||
| + | Michael: no news. | ||
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| c) Estimation algorithms (Shivaraj, Eric) | c) Estimation algorithms (Shivaraj, Eric) | ||
| + | Eric: posted slides: | ||
| + | https:// | ||
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| + | Eric: Going back to the beginning and trying to rebuild the radiometer algorithm to | ||
| + | understand it better now, and to make things easier in the future. Studying the overlap | ||
| + | reduction between seismometers, | ||
| + | Assume isotropic distribution of eg P-waves only or S-waves only, two detectors some distance | ||
| + | apart, look at different detector orientations. Normalization of the overlap reduction function | ||
| + | such that at low frequency it shows the fraction of the power detected, so it approaches 1/3 | ||
| + | (due to 3D nature of the siimulated field). | ||
| + | Victor: similar studies have been done in the past, showing that lower frequencies are | ||
| + | correlated over longer distances. There is also a difference between surface and body waves. | ||
| + | Eric: Next, will develop the code to simulate different seismic noise fields, stochastic | ||
| + | rather than sinusoidal. Should allow adding different modes in the future, with different | ||
| + | directionality and different frequency content. | ||
| + | Victor: should also worry about heterogeneity. | ||
| + | Vuk: definitely should include it, although it may be more important and high than at low frequencies. | ||
| + | Eric: will also redo the map-computation code, including the spherical harmonic decomposition | ||
| + | code copied from the GW field. | ||
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