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| groups:homestake:meetings:20150723 [2015/07/23 10:49] – prestegard | groups:homestake:meetings:20150723 [2015/07/23 10:55] (current) – prestegard |
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| Homestake Meeting Minutes, 07/23/15 | Homestake Meeting Minutes, 07/23/15 |
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| Attending: Tanner, Pat, Victor, Gary | Attending: Tanner, Pat, Victor, Gary, Daniel |
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| Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home | Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home |
| * Gary: working on some tools for doing particle motion analysis quantitatively. Takes seismograms and plots vector motion in 3D so you can visualize the particle motion. Needs a GUI so you can specify certain parameters, but it's difficult to do. | * Gary: working on some tools for doing particle motion analysis quantitatively. Takes seismograms and plots vector motion in 3D so you can visualize the particle motion. Needs a GUI so you can specify certain parameters, but it's difficult to do. |
| * Gary: what's more important to do is to take the data and try to find a model for the particle motion. Using multi-wavelet method to get best-fit of particle motion ellipse at a given time step and in a given frequency band. This is a useful tool for anisotropy, helps to quantify the actual particle motion in terms of a major and minor axis and look at the frequency dependence. Can measure orientation of the ellipse relative to direction of wave propagation; will tell us how much particle motion deviates from simple models. Can also try to quantify shear wave splitting. | * Gary: what's more important to do is to take the data and try to find a model for the particle motion. Using multi-wavelet method to get best-fit of particle motion ellipse at a given time step and in a given frequency band. This is a useful tool for anisotropy, helps to quantify the actual particle motion in terms of a major and minor axis and look at the frequency dependence. Can measure orientation of the ellipse relative to direction of wave propagation; will tell us how much particle motion deviates from simple models. Can also try to quantify shear wave splitting. |
| | * Daniel: have been working with Victor to take waveforms from a given event and find the optimal waveform to describe it. So far we are just using time delays, nothing fancy with anisotropy or reflection, but it's working well so far. |
| | * Gary: is this just cross-correlation? |
| | * Daniel: taking the waveforms from the onset t-arrival and doing an inversion that would account for them and for free surface reflections. We are seeing a very strong effect from free surface reflections, it might be very useful to include this in the radiometry code as well. |
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| Next call August 6. | Next call August 6. |