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Title:	Resurvey of Byrd Station, Antarctica, drill hole
Authors:	National Science Foundation (U.S.). Office of Polar Programs. Garfield, Donald E. Ueda, Herbert T.
Keywords:	Antarctic regions Antarctica Byrd Station, Antarctica Azimuth measurements Drill holes Boring Drilling Ice Ice coring Ice coring rigs Inclinometer Inclination measurements EPOLAR
Publisher:	Cold Regions Research and Engineering Laboratory (U.S.) Engineer Research and Development Center (U.S.)
Series/Report no.:	Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 243.
Description:	Special Report Abstract: 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 inclinometer 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 ft/yr (2.23 m/yr). The direction of movementr elative to the surface varies from southwest at 300ft (91.5m) to northeast at 1100 ft (335 m),to east at 3368 ft (1027 m), and to northeast at 4835ft (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.
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/11784
Appears in Collections:	Special Report