Citation

Geoscience Australia provides most of its products for free under a Creative Commons Attribution 3.0 Australia Licence. We only require that you reference the use of our data or information using the following citation:
Hackney, R., 2010. Potential-field Data Covering the Capel and Faust Basins, Australia's Remote Offshore Eastern Frontier. Record  2010/034. Geoscience Australia, Canberra.

Abstract

Record documenting sources of gravity and magnetic data covering the Capel and Faust basins (Lord Howe Rise) and the processes applied to level the data.
Google map showing geographic bounding box with values North bound -24.0 East bound 165.0 West bound 157.0 South bound -31.0
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please contact Geoscience Australia Client Services via:

fax:
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Product Type/Sub Type

dataset - GA Publication - Record

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2010

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
marine survey
magnetics
gravity
data
continental margins
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-24.0
East bound
165.0
West bound
157.0
South bound
-31.0

Lineage

The source data used to generate a levelled dataset for the Capel and Faust basins includes: 1) a dataset of gravity and magnetic data for the Australian region sourced internally from Geoscience Australia holdings of ship-track data and levelled by Desmond Fitzgerald and Associates Pty Ltd (now Intrepid Geophysics) in the late 1990s under contract to the Australian Geological Survey Organisation (now Geoscience Australia); 2) gravity and magnetic data from Geoscience Australia seismic survey GA-302 (2006/2007); and 3) gravity and magnetic data from Geoscience Australia marine survey GA-2436 (2007). The data for the GA-302 and GA-2436 surveys were provided to Geoscience Australia in mid-2008 by Fugro Robertson LCT Gravity and Magnetics Division (Job Numbers 4640 and 4731), the contractor used by Geoscience Australia to process gravity and magnetic data from these surveys. The processing steps applied to this dataset include: 1) re-computation of free-air gravity anomalies to ensure consistent computation of gravity anomalies between the different datasets; 2) splitting ship-tracks into relatively straight line segments to avoid multiple cross-overs between any pair of lines; 3) line filtering of the previously-levelled Australia-wide dataset to reduce noise and improve cross-over computations; 4) merge the individual datasets into a single master dataset for levelling; 5) editing to remove lines or line segments with spurious data - lines that were too short or too close to other line segments were also removed in order to improve levelling results; 6) line levelling - gravity data were levelled using a polynomial levelling technique referenced to a satellite radar altimetry-derived dataset, magnetic data were loop levelled (minmising misclosures around closed loops formed by ship tracks); 7) computation of simple Bouguer gravity anomalies (ie. without terrain corrections) using a spherical-cap Bouguer correction and a density contrast between water and sediment of 970 kilograms per cubic metre and water depths interpolated at each data point from the 2009 Bathymetry and Topography Grid of Australia. The data processing and levelling were conducted using the INTREPID software from Intrepid Geophysics (versions 4.2.756 and 4.2.1782). The resulting gravity and magnetic data for the Capel and Faust basins are contained in INTREPID vector databases and are also available in an ascii column-based file exported from INTREPID.

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf
misc

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-f884-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2010-07-16

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).