AAGD07: A new absolute gravity datum for Australian gravity and new standards for the Australian National Gravity Database  


Authors / CoAuthors

Tracey, R. | Bacchin, M. | Wynne, P.

Abstract

The current Australian gravity datum, Isogal84, is defined by the Australian Fundamental Gravity Network (AFGN). The AFGN consists of more than 950 stations at over 250 locations throughout Australia with the first stations in the network being established in the early 1950's. Prior to Isogal84, the datum was based on relative ties to overseas sites. The Isogal84 datum is based on 5 absolute gravity sites within Australia that were established in 1979 using a Soviet absolute gravimeter. Absolute gravity measurements conducted at 60 AFGN sites by Geoscience Australia using a portable absolute gravimeter have shown that the Isogal84 datum is 78 microgals (1 microgal = 1x10-8 m/s2) higher than the absolute measurements. A new gravity datum, the Australian Absolute Gravity Datum 2007 (AAGD07), has been defined based on these absolute gravity measurements and the AFGN and the Australian National Gravity Database (ANGD) have been adjusted to this new datum. Concurrent with implementing AAGD07, the formulae used for reducing gravity data in the ANGD have been reviewed and updated. These changes include using the 1980 International Gravity Formula, ellipsoidal heights, and a spherical cap bouguer correction that accounts for the Earth's curvature. These new formulae provide more accurate anomalies, particularly in longer wavelengths which will be beneficial to regional studies.

Product Type

document

eCat Id

65388

Contact for the resource

  Custodian

MNHD  

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

  • External PublicationConference Paper
( Theme )
  • data standards
( Theme )
  • geophysics
( Theme )
  • gravity
  • AU
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences
  • Published_External

Publication Date

2017-11-21T04:50:45

Creation Date

2007-01-01T00:00:00

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Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - restricted

Use - license

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Purpose

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unknown

Topic Category

geoscientificInformation

Series Information

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Unknown

Parent Information

Extents

[-45, -9, 110, 155]

Reference System

Spatial Resolution

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