Campuses:
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | |||
| groups:homestake:meetings:20160310 [2016/03/10 10:32] – mandic | groups:homestake:meetings:20160310 [2016/03/10 10:52] (current) – mandic | ||
|---|---|---|---|
| Line 4: | Line 4: | ||
| - Homestake array | - Homestake array | ||
| - | * status of stations (WTP, Yates, 800): Still problems with Yates, and one of the masses at 800 seems stuck, have to recenter it. WTP seems to be working fine, although the voltage maxes out to 12-13V, less than other stations. There were data gaps from 4850C, probably due to blasting. Probably lost power too, in two 10hr periods, so 20hrs total. Data flow going ok. | + | * status of stations (WTP, Yates, 800): |
| - | * Gary: looked at the data, looks like they used a sequence of charges, it would be good to try to deconvolve them. Would need to know the timing of the explosions. | + | * Tanner: Still problems with Yates, and one of the masses at 800 seems stuck, have to recenter it. WTP seems to be working fine, although the voltage maxes out to 12-13V, less than other stations. There were data gaps from 4850C, probably due to blasting. Probably lost power too, in two 10hr periods, so 20hrs total. Data flow going ok. |
| + | * Gary: looked at the data, looks like they used a sequence of charges, it would be good to try to deconvolve them. Would need to know the timing of the explosions. Will follow up on this. | ||
| * planning next visit: April 15-24 | * planning next visit: April 15-24 | ||
| - | * Forego RR station for this trip, data flow has been stable | + | * Forego RR station for this trip, data flow has been stable. Will simplify the visit a bit. |
| - | * PASSCAL sent the new instrument for Yates | + | * PASSCAL sent the new instrument for Yates, should arrive within a week. |
| - | * Need to produce the workplan. Pat and Terry to reserve a car and a hotel (lodge should be available too). | + | * Need to produce the workplan |
| - data analysis updates | - data analysis updates | ||
| - | * Tanner: took an event from Gary's catalog, tried to identify the Rayleigh part of it, about 30sec from a local blast. Filtered the data, estimating the frequency of the wave by eye. Then do principal component analysis: compute the covariance matrix, then its eigenvalues, | + | * Tanner: took an event from Gary's catalog, tried to identify the Rayleigh part of it, about 30sec from a local blast. Filtered the data, estimating the frequency of the wave by eye. Then do principal component analysis: compute the covariance matrix, then its eigenvalues, |
| - | * Daniel: all sounds great. A more common approach people use is to fix the source direction, and then force the azimuth. | + | * Daniel: all sounds great. A more common approach people use is to fix the source direction, and then force the azimuth. But Tanner' |
| - | * Daniel: showed plots that can be used to convince ourselves that we are looking at the Rayleigh wave, by plotting | + | * Daniel: showed plots that can be used to convince ourselves that we are looking at the Rayleigh wave, by looking at the velocity vs frequency or period |
| + | * Gary: could provide additional tools used in seismology to help Tanner' | ||
| + | * Tanner: want to do the analysis at all frequencies (eg 10-20 steps between 0.1 and 10 Hz) and at all stations, to study the amplitude vs depth dependence. And fit a power law to extract the fit parameters. | ||
| + | * Daniel: looking at the eigenfunctions as a function of depth would also be very interesting. | ||
| + | * Gary: making progress on understanding the data from the surface shots. Have a table for when data is good in a given station. Then cross-correlate stations to get time-lags for each shot to within 1ms. Difficult problem, but seems doable. | ||
| + | * Ross: processed the seismic line data at 2000 level, seeing reflectors in the data. Not sure if from open cut or the free surface. Should have a presentation next meeting. | ||
| + | * Vuk: Victor gave Levi some pointers about how to look for the missing information on minerals. Levi will follow up on it. | ||
| + | Next meeting: March 24, will focus on data analysis updates. | ||