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groups:homestake:meetings:20150723 [2015/07/23 10:49] – prestegardgroups: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
  
-Attending: Tanner, Pat, Victor, Gary+Attending: Tanner, Pat, Victor, Gary, Daniel
  
 Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home
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   * Tanner: no update from UMN, busy with other things.   * Tanner: no update from UMN, busy with other things.
   * 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.+  * 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.
  
 Next call August 6.  Next call August 6. 
groups/homestake/meetings/20150723.1437666541.txt.gz · Last modified: 2015/07/23 10:49 by prestegard

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