Abstract:
A seismic refraction survey was conducted on sea ice near Butter Point to provide data on sediment thickness for possible further drilling and to investigate the cause of a reported gravity anomaly. 12 vertical geophones were spaced at 29.95m intervals, frozen in to holes chipped in the sea ice and covered by 100-200mm of snow. Two reverse lines were shot, using four shot points.
Quality
The investigator has retired. Most of the data was reported in the publication. Appendix 1 Seismic Refraction Survey contains the following data: A: Details of shots fired (Line, Shot Number, Time, Shot Depth, Charge, Shot instant warning time, Fuse Burning time, Offset = distance to nearest geophone) B: Linear Regression Lines for the Refraction Arrivals at each spread (Line, Spread, Offset, Shot Point, Apparent Velocity, Intercept, Comments) C: Time/Distance graph for Line 1 D: Time/Distance bar graph for Line 2 E: Plane Layer Interpretation F: Shot Instant Detection G: Ray Tracing Analysis
Iles, D. Dibble, R.R. 1981 Seismic refraction survey on sea-ice near Butter Point, New Harbour, McMurdo Sound. Immediate report - Victoria University of Wellington Antarctic Expedition 25. Wellington Antarctic Research Centre, Victoria University of Wellington
