Aeromagnetic data centered over Skelton Neve, Antarctica: A Web Site for Distribution of Data and Maps (on-line edition)
Entry ID:
Skelton_Aeromag_Data
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Summary
Abstract:
The Transantarctic Mountains (TAM) rift-flank uplift has developed along the ancestral margin of the East Antarctic craton, and forms the boundary between the craton and the thinned lithosphere of the West Antarctic rift system. Geodynamic processes associated with the exceptionally large-magnitude uplift of the mountain belt remain poorly constrained, but may involve interaction of rift-related ... mechanical and thermal processes and the inherited mechanical
elements of the cratonic lithosphere. The Transantarctic Mountain
Aerogeophysical Research Activities (TAMARA) program proposes to document the
regional structural architecture of a key segment of the Transantarctic
Mountains in the region around the Royal Society Range where the rift flank is
offset along a transverse accommodation zone. 
Purpose:
In December through January, 1998, the TAMARA group flew a helicopter
aeromagnetic survey and collected ground gravity station data. These data will
be integrated with other geologic and geophysical information from the region
in order to map the large-scale structures along the TAM where relations
between longitudinal and transverse structures along the rift flank can be
resolved.
Supplemental_Information:
An aeromagnetic grid was created for the survey area. In addition, 65 gravity
stations were collected in profile-form in the Skelton Neve region.
Related URL
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Description:
Gridded data may be downloaded without charge from the above URL.
Description:
URL provides project information, references, and data set downloads.
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Multimedia Sample
View full image
Caption:
Skelton Neve, Antarctica Aeromagnetic Anomaly Map
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: -77.5
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S: -79.7
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E: 166.7
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W: 153.5
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Data Set Citation
Dataset Originator/Creator:
D. Damaske, C. A. Finn, H-D. Moeller, C. Demosthenous, E. D. Anderson
Dataset Title:
Aeromagnetic data centered over Skelton Neve, Antarctica: A website for distribution of data and maps (on-line edition)
Dataset Series Name:
U.S. Geological Survey Open-File Report
Dataset Release Date:
2002
Dataset Release Place:
Denver, Colorado, USA
Dataset Publisher:
U.S. Geological Survey
Issue Identification:
Open-File Report 02-452
Data Presentation Form:
raster digital data
Online Resource:
http://pubs.usgs.gov/of/2002/ofr-02-452
Temporal Coverage
Start Date:
1997-01-01
Stop Date:
1998-12-31
Quality
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The digital data are grids, which were created from helicopter
magnetometer observations. Grid values represent the total
intensity of the Earth's magnetic field after filtering to remove any
anomalous noise, adjusting for ... the diurnal component of the magnetic
field, and removal of the International Geomagnetic Reference Field
(IGRF).
The data in the original grids have been processed using formulas and
methods that are not usually documented but that represent
industry standard practices for airborne data reduction.
Logical_Consistency_Report:
During the 1997-1998 field season, the TAMARA project collected about
14,100 line-km of helicopter magnetic data, covering an area just a
little less than 30,000 sq km. One hundred twenty-five hours of helicopter
time were used to complete the survey. Relative to the initial plans,
92.5% of line-kilometers, or 95% of the planned area, was covered.
Magnetic base stations established in McMurdo and the Skelton Neve field
camp recorded the daily variations of Earth's magnetic field for removal
from the total-field observed from the helicopter. The position of a
cesium magnetometer carried in a bird slung 30 m below the helicopter was
accomplished with Trimble 4000 GPS receivers. Barometric altitudes were
also recorded. The data from each flight were quality controlled.
The crew for the aeromagnetic helicopter-borne program consisted of 3
helicopter support personnel (including 2 pilots and an engineer) and 6
scientific staff (geophysicists, engineers, and quality control
specialists). Bundesanstalt fur Geowissenschaften und Rohstoffe (BGR)
contributed a geophysicist, an engineer, and a quality control
specialist. Three additional scientists were from the USGS and Ohio
State University. A general assistant for camp operations and a
mountaineer were supported by the National Science Foundation (NSF).
In addition to the aeromagnetic data, 65 gravity stations were collected
in profile-form in the Skelton Neve region.
More details are found in the report describing the compilation of
the original grids: http://pubs.usgs.gov/of/2002/ofr-02-452
Completeness_Report:
Areas with no aeromagnetic data are flagged with dummy values,
which are described for the grids in a readme.txt file.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Flight Path Recovery - High-resolution horizontal position
of the survey aircraft used to collect data were determined
from differential positioning techniques based on Global
Positioning System (GPS) satellites. Positioning data were
recorded in-flight independently using a Trimble GPS receiver.
For most flights GPS reference station data at either Skelton
Neve Camp or McMurdo were available and a differential position
was calculated. For gaps in differential positioning, original
GPS Rover data were used, adjusted at both ends of any gap.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Flight Path Recovery - High-resolution vertical position
of the survey aircraft used to collect data were determined
from differential positioning techniques based on Global
Positioning System (GPS) satellites. Positioning data were
recorded in-flight independently using a Trimble GPS receiver.
For most flights GPS reference station data at either Skelton
Neve Camp or McMurdo were available and a differential position
was calculated. For gaps in differential positioning, original
GPS Rover data were used, adjusted at both ends of any gap.
Access Constraints
None
Use Constraints
Please cite data providers
Distribution
Distribution Media:
Online (HTTP)
Distribution Size:
3.0 Mbytes
Distribution Format:
ArcInfo
Fees:
None for online downloads
Distribution Media:
Online (HTTP)
Distribution Size:
1.7 Mbytes (largest file)
Distribution Format:
ASCII
Fees:
None for online downloads
Distribution Media:
Online (HTTP)
Distribution Size:
848 Kbytes (largest file)
Distribution Format:
ER mapper
Fees:
None for online downloads
Distribution Media:
Online (HTTP)
Distribution Size:
545 Kbytes (largest file)
Distribution Format:
geosoft
Fees:
None for online downloads
Distribution Media:
Online (HTTP)
Distribution Size:
850 Kbytes (largest file)
Distribution Format:
USGS ODDF
Fees:
None for online downloads
Personnel
Role:
INVESTIGATOR
Role:
TECHNICAL CONTACT
Phone:
303-236-5652
Email:
ericanderson at usgs.gov
Contact Address:
U.S. Geological Survey, Geology Division
Box 25046, MS 964
Denver Federal Center
City:
Denver
Province or State:
CO
Postal Code:
80225-0046
Country:
USA
Role:
DIF AUTHOR
Phone:
303-236-1389
Email:
rsweeney at usgs.gov
Contact Address:
U.S. Geological Survey, Geology Diviion
Box 25046, MS964
Denver Federal Center
City:
Denver
Province or State:
CO
Postal Code:
80225-0046
Country:
USA
Publications/References
MASLANYJ, M.P., & DAMASKE, D., 1986, Lessons regarding aeromagnetic surveying during magnetic disturbances in polar regions: British Antarctic Survey Bulletin, 73, 9-17.
DAMASKE, D., MARCINKOWSKI, V., MÖLLER, H.-D., in press, Aeromagnetic survey in central Dronning Maud Land, East Antarctica, during the GeoMaud expedition 1995/96: Lay-Out, Execution, and Data Processing: Geologisches Jahrbuch.
Creation and Review Dates
DIF Creation Date:
2003-04-24
Last DIF Revision Date:
2004-10-01
Future DIF Review Date:
2004-04-24
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