Accession Number:

ADA021657

Title:

Resurvey of Byrd Station, Antarctica, Drill Hole.

Descriptive Note:

Special rept.,

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s):

• Garfield,Donald E.
• Ueda,Herbert T.

Report Date:

1975-12-01

Pagination or Media Count:

16.0

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 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

Descriptors:

• *ICE PENETRATION
• *CORE SAMPLING
• DEFLECTION
• SURVEYING(GEOGRAPHIC)
• ANTARCTIC REGIONS
• DRILLING
• GRAVITY ANOMALIES

Subject Categories:

• Geodesy
• Snow, Ice and Permafrost

Distribution Statement:

APPROVED FOR PUBLIC RELEASE