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Resurvey of Byrd Station, Antarctica, Drill Hole.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Pagination or Media Count:
The drill hole at Byrd Station, which was surveyed in January 1968 to a vertical depth of 7063 ft 2153 m below the top of the casing, was resurveyed in January 1975 to a vertical depth of 4835 ft 1474 m. Inclination and azimuth measurements were made with a Parsons multiple-shot inclinometers and compared with the earlier measurements made during drilling. The results indicate a progressively increasing displacement with depth to a value of 51.2 ft 15.6 m at the 4835-ft 1474-m level, or about 7.3 ftyr 2.23 myr. The direction of movement relative to the surface varies from southwest at 300 ft 91.5 m to northeast at 1100 ft 335 m, to east at 3368 ft 1027 m, and to northeast at 4835 ft 1474 m, indicative of a complex twisting motion. An increase in accessible depth along the hole axis of 18 ft 5.49 m beyond the 1969 depth was noted. No attempt was made to measure hole diameter or vertical strain. It is recommended that the hole be resurveyed in 3-5 years if it is still logistically feasible, using a better inclinometer. Author
APPROVED FOR PUBLIC RELEASE