Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This East Arunta Gravity Complete Bouguer Anomaly 1VD is a complete Bouguer anomaly grid for the East Arunta (P200680). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. This gravity survey was acquired under the project No. 200680 for the geological survey of NT. The grid has a cell size of 0.00376 degrees (approximately 400m). A total of 5231 gravity stations were acquired to produce this grid.
Product Type
dataset
eCat Id
144008
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Data centre )
-
- NCI
- ( Discipline )
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- Earth sciences
- ( Discipline )
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- geophysics
- ( Feature type )
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- grid
- ( Place )
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- Australia
- ( Place )
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- NT
- ( Project )
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- survey 200680
- ( Theme )
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- GADDS2.0
- ( Theme )
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- gravity
- ( Theme )
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- Bouguer
- ( Theme )
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- infinite slab
- ( Theme )
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- complete
- ( Theme )
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- 1VD
- ( Theme )
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- first vertical derivative
- ( Theme )
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- ground digital data
- ( Theme )
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- geophysical survey
- ( Theme )
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- grav
- ( Theme )
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- grid
- ( Theme )
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- raster
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- Published_External
Publication Date
2020-03-09T00:00:00
Creation Date
2020-03-09T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This East Arunta Gravity Complete Bouguer Anomaly 1VD is a first vertical derivative of the complete Bouguer anomaly grid for the East Arunta (P200680). This gravity survey was acquired under the project No. 200680 for the geological survey of NT. The grid has a cell size of 0.00376 degrees (approximately 400m). A total of 5231 gravity stations at 2000m spacing were acquired to produce this grid. The complete Bouguer gravity anomalies were calculated by applying terrain correction (Bullard C - which accounts for the undulations of the surrounding topography) to the spherical cap Bouguer anomaly point data of East Arunta (P200680). These terrain corrections were calculated using software from INTREPID Geophysics. The Intrepid algorithm utilises concentric rings subdivided into cells (Direen, 2001) to calculate the terrain correction. The data were then gridded using a gridding technique provided by the INTREPID Geophysics software package. A Fast Fourier Transform (FFT) process was applied to the complete infinite slab Bouguer gravity grid of the survey area to calculate the first vertical derivative grid. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose. Details of the specifications of individual surveys held in the Australian National Gravity Database (ANGD) can be found in the Second Edition of the Index of Gravity Surveys (Wynne and Bacchin, 2009). References: Direen, N.G., 2001. Application of terrain corrections in Australia (2001). Intrepid Geophysics, http://www.intrepid-geophysics.com; Wynne, P., and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.
Parent Information
Geophysical Data Collection - gravity
UUID - c6b58f54-102c-19e9-e044-00144fdd4fa6,
eCat ID - 74512
Extents
[-23.5354, -22.467, 135.1517, 138.0197]
Reference System
None
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
This East Arunta Gravity Complete Bouguer Anomaly 1VD includes ground gravity data for the East Arunta (P200680) acquired for the geological survey of NT