Active Seismics on Sorsdal Glacier 2015-2016

The active seismics are all part of a survey of the Sorsdal Glacier. They are designed to measure ice thickness, and the thickness of the water column underneath the ice shelf where the ice is floating. This was part of an investigation to determine the location of the grounding line on Sorsdal Glacier.Sorsdal Glacier site S04 - 14/12/2015Timing: 2000 - 2150Coordinates: S68 42.006, E78 09.439Team: Sue Cook, James Hamilton, Marty BenaventeWeather: Some high cloud, low wind, good visibilitySite notes: Crevasses greater than 2 m wide running in along flow direction (parallel to geophone cables). Surface very thin layer of icy/hard packed snow with blue ice underneath.Equipment: Geometrics Geode Seismograph communicating with a laptop via ethernet cable using Geometrics Seismodule Controller Software Version 11.1.69.0 (Geometrics Inc., 2014)Sampling: 4-second records at 4000 samples/secondGeophones: 40 Hz Blue/yellow geophones used.Seismic survey layout: 2 x 36 m cables (3 m spacing)Geophones all set into surface by drilling small hole with handheld drill. Bearing of seismic line: 338 degrees (on compass, no magnetic declination applied)Geophones 1-12 to East, 13-24 to WestHammer blows began from East end of line (geophone 1), moving every 6 m towards West end of line. 10 blows at each location.Sources:Geophone,File,Hammer swinger1, 2.dat, JH3, 3.dat, JH5, 4.dat, JH7, 5.dat, JH9, 6.dat, JH11, 7.dat, JH24, 8.dat, MB22, 9.dat, MB20, 10.dat, MB18, 11.dat, MB16, 12.dat, MB14, 13.dat, MBcentre, 14.dat, MB