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Homestake Meeting Minutes, 10/15/15

Attending:

Homestake wiki: https://zzz.physics.umn.edu/groups/homestake/home

Our agenda:

1) Homestake array status

2) Update on activation experiments

3) data analysis updates

1. analysis updates

1. planning for data analysis workshop, Oct 23-25 (Fri-Sun) at UMN.

Proposed topics:

1. A session to talk out what each group's broader goals with background to make sure we all understand each other. Two options: (a) have people give talks on specific topics, or (b) open discussion with prompting questions. Gary recommends a hybrid were a couple of us give short presentations with linked discussions. Topics might be:
   1. Teach seismologists some basics of gravitational waves, how GW detectors work, and why seismology is relevant.
   2. Teach physicists some basics of seismic wave propagation to your students. Here is a list of some items that are clearly relevant: P and S body waves in isotropic media, Rayleigh and Love waves, anisotropic media basics (velocity dependence on direction, shear wave splitting, and particle motions in an isotropic medium), and the free surface interaction in isotropic and anistropic media.
   3. These are probably best done the context of what our broad science goals are.

1. Gary has some analysis code under development to show. These are tools to visualize and measure three-component particle motions.

1. We need to give an overview of the active source data and any preliminary results we can show by then.

1. Gary started an event catalog for the experiment. It needs some tuning, but Gary can show the group what he has.

1. instrument calibration

1. What do we know about velocity (vs depth, vs direction) - this is linked to your active source study

1. Wiener filter study - this is pursued by Michael Caughlin and Jan Harms, and neither will be present. Maybe we can ask them to connect remotely

1. estimating the composition of the seismic noise. This would include the algorithm we are developing, maybe some simulations and applications to data. It should also include using some of the other algorithms from geo-community. Related to this is also understanding the Rayleigh waves better - how their amplitude depends on depth, P-vs-S content etc. I am sure learning for geophysicists would help us a lot here…