Resurvey of Byrd Station, Antarctica, Drill Hole.
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 an...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1975
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA021657 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA021657 |
id |
ftdtic:ADA021657 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA021657 2023-05-15T14:01:32+02:00 Resurvey of Byrd Station, Antarctica, Drill Hole. Garfield,Donald E. Ueda,Herbert T. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1975-12 text/html http://www.dtic.mil/docs/citations/ADA021657 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA021657 en eng http://www.dtic.mil/docs/citations/ADA021657 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geodesy Snow Ice and Permafrost *ICE PENETRATION *CORE SAMPLING DEFLECTION SURVEYING(GEOGRAPHIC) ANTARCTIC REGIONS DRILLING GRAVITY ANOMALIES Byrd station(Antarctic) Inclinometers Text 1975 ftdtic 2016-02-20T10:37:20Z 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 ft/yr (2.23 m/yr). 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) Text Antarc* Antarctic Antarctica Ice permafrost Defense Technical Information Center: DTIC Technical Reports database Antarctic Byrd Byrd Station ENVELOPE(-119.533,-119.533,-80.017,-80.017) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geodesy Snow Ice and Permafrost *ICE PENETRATION *CORE SAMPLING DEFLECTION SURVEYING(GEOGRAPHIC) ANTARCTIC REGIONS DRILLING GRAVITY ANOMALIES Byrd station(Antarctic) Inclinometers |
spellingShingle |
Geodesy Snow Ice and Permafrost *ICE PENETRATION *CORE SAMPLING DEFLECTION SURVEYING(GEOGRAPHIC) ANTARCTIC REGIONS DRILLING GRAVITY ANOMALIES Byrd station(Antarctic) Inclinometers Garfield,Donald E. Ueda,Herbert T. Resurvey of Byrd Station, Antarctica, Drill Hole. |
topic_facet |
Geodesy Snow Ice and Permafrost *ICE PENETRATION *CORE SAMPLING DEFLECTION SURVEYING(GEOGRAPHIC) ANTARCTIC REGIONS DRILLING GRAVITY ANOMALIES Byrd station(Antarctic) Inclinometers |
description |
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 ft/yr (2.23 m/yr). 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) |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
Garfield,Donald E. Ueda,Herbert T. |
author_facet |
Garfield,Donald E. Ueda,Herbert T. |
author_sort |
Garfield,Donald E. |
title |
Resurvey of Byrd Station, Antarctica, Drill Hole. |
title_short |
Resurvey of Byrd Station, Antarctica, Drill Hole. |
title_full |
Resurvey of Byrd Station, Antarctica, Drill Hole. |
title_fullStr |
Resurvey of Byrd Station, Antarctica, Drill Hole. |
title_full_unstemmed |
Resurvey of Byrd Station, Antarctica, Drill Hole. |
title_sort |
resurvey of byrd station, antarctica, drill hole. |
publishDate |
1975 |
url |
http://www.dtic.mil/docs/citations/ADA021657 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA021657 |
long_lat |
ENVELOPE(-119.533,-119.533,-80.017,-80.017) |
geographic |
Antarctic Byrd Byrd Station |
geographic_facet |
Antarctic Byrd Byrd Station |
genre |
Antarc* Antarctic Antarctica Ice permafrost |
genre_facet |
Antarc* Antarctic Antarctica Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA021657 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766271378954125312 |