-------------------------------------------------------------------------------- Readme for the global SKS splitting compilation used in Becker, T. W., Lebedev, S., and Long, M. D.: On the relationship between azimuthal anisotropy from shear wave splitting and tomographic models. J. Geophys. Res., 117, B01306, doi:10.1029/2011JB008705, 2012. http://www-udc.ig.utexas.edu/external/becker/preprints/bll11.pdf -------------------------------------------------------------------------------- The SKS database consists of two files, a cleaned up, merged version of individual splits, and a station averaged file (see http://www-udc.ig.utexas.edu/external/becker/sksdata.html for references and updates). Thorsten Becker, August 2016 thwbecker@post.harvard.edu * Format description - Individual splits (14326 entries, including nulls) station lat lon azi d_azi dt d_dt type elat elon edep mlat mlon bazi > head ftp/becker2011.sks.table 007x 34.1000 241.4000 83.0 0.0 1.50 0.00 1 34.1000 241.4000 0.0 34.1000 241.4000 0.0 012x 34.1400 241.4400 81.0 0.0 1.35 0.00 1 34.1400 241.4400 0.0 34.1400 241.4400 0.0 028x 34.2800 241.4600 82.0 0.0 1.50 0.00 1 34.2800 241.4600 0.0 34.2800 241.4600 0.0 040x 34.3900 241.4700 273.0 0.0 2.35 0.00 1 34.3900 241.4700 0.0 34.3900 241.4700 0.0 043x 34.4200 241.4700 285.0 0.0 1.55 0.00 1 34.4200 241.4700 0.0 34.4200 241.4700 0.0 046x 34.4500 241.4700 79.0 0.0 1.30 0.00 1 34.4500 241.4700 0.0 34.4500 241.4700 0.0 061x 34.5800 241.5400 272.0 0.0 1.25 0.00 1 34.5800 241.5400 0.0 34.5800 241.5400 0.0 101 38.8340 77.5360 35.0 0.0 0.50 0.00 1 38.8340 77.5360 30.0 38.8340 77.5360 0.0 10 -23.6160 292.1550 91.0 0.0 0.80 0.00 1 -23.6160 292.1550 30.0 -23.6160 292.1550 0.0 10 -23.6160 292.1550 91.0 15.0 0.80 0.20 1 -23.6160 292.1550 0.0 -23.6160 292.1550 0.0 station: is the station name lat/lon: are the station coordinates, in degrees, latitude and longitude azi: the apparent fast polarization azimuth in degrees CW from North d_azi: the error in degrees (zero if not specified), dt: the delay time in seconds (zero if null), d_dt: the error in the delay time (0 if not given), If measurements are Nulls, both azi, dt, d_azi, and d_dt will be set to zero type: the type of measurement 1 = SKS 2 = local S 3 = Ppol 4 = SKKS elon/elat: mlon/mlat: are event and path mid point coordinates. If not provided, or only partially provided, the station coordinates are used. edep: is the event depth, if provided, else set to zero. bazi: the back-azimuth (in degrees CW from N), if provided, else zero. - Averaged splits (5159 entries): arithmetically averaged for colocated sites. In this case, all event and mid point coordinates are set to the station coordinates, station names are set to "avg", and back-azimuth is set to zero. > head ftp/becker2011.sks.avg.table avg -89.9800 0.0000 68.0 0.0 1.30 0.00 1 -89.9800 0.0000 0.0 -89.9800 0.0000 0.0 avg -75.0000 0.0700 73.0 0.0 0.50 0.00 1 -75.0000 0.0700 0.0 -75.0000 0.0700 0.0 avg 43.0600 0.1500 90.0 0.0 0.80 0.00 1 43.0600 0.1500 0.0 43.0600 0.1500 0.0 avg 40.8200 0.4900 82.9 32.6 0.99 0.19 1 40.8200 0.4900 0.0 40.8200 0.4900 0.0 avg 43.6600 0.5600 46.0 0.0 1.20 0.00 1 43.6600 0.5600 0.0 43.6600 0.5600 0.0 avg 41.8800 0.7500 101.0 0.8 1.40 0.08 1 41.8800 0.7500 0.0 41.8800 0.7500 0.0 avg 42.4000 0.7600 99.0 0.0 1.50 0.00 1 42.4000 0.7600 0.0 42.4000 0.7600 0.0 avg 43.1800 0.7600 98.0 0.0 0.60 0.00 1 43.1800 0.7600 0.0 43.1800 0.7600 0.0 avg 42.6300 0.7700 102.0 0.0 1.30 0.00 1 42.6300 0.7700 0.0 42.6300 0.7700 0.0 avg 42.9600 1.0900 70.0 0.0 0.90 0.00 1 42.9600 1.0900 0.0 42.9600 1.0900 0.0