Self-gradient effects for airborne gravity gradiometry

Paul Johnston

doi:10.1071/ASEG2012ab077

ISSN: 2202-0586
E-ISSN:

oa Self-gradient effects for airborne gravity gradiometry
Authors Paul Johnston^a
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^a University of Western AustraliaSchool of Physics M013, , 35 Stirling Hwy, Crawley, WA 6009, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2012ab077
- Published online: 01 Dec 2012

Abstract

Summary

The method by which an airborne gravity gradiometer measures gravity gradients and is stabilised within the aircraft affects the magnitude of the observed gravity gradient due to the nearby masses in the aircraft. To first order, the gravity gradient due to masses within the aircraft can be modelled using point masses. When the centre of mass of the instrument is stationary with respect to the aircraft, self-gradient is caused by rotation of masses about the centre of mass of the instrument resulting in a modest contribution to changes in observed gravity gradient. Movement of the centre of mass of the instrument with respect to the aircraft produces a larger self-gradient signal. In either case, the self-gradient signal correlates well with aircraft motion and can be easily removed from the observations by post-processing without the need for a complex model of the mass distribution within the aircraft.

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2012-12-01

2026-01-25

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References

Anstie, J., Aravanis, T., Johnston, P., Mann, A., Longman,M., Sergeant, A., Smith, R., Van Kann, F., Walker, G., Wells, G., and Winterflood, J. 2010, Preparation for flight testing the VK1 gravity gradiometer: In R. J. L. Lane (editor), Airborne Gravity 2010 - Abstracts from the ASEG-PESA Airborne Gravity 2010 Workshop: Published jointly by Geoscience Australia and the Geological Survey of New South Wales, Geoscience Australia Record 2010/23 and GSNSW File GS2010/0457.
Carroll, K. A., Hatch, D. and Main, B. 2010, Performance of the Gedex High-Definition Airborne Gravity Gradiometer: In R. J. L. Lane (editor), Airborne Gravity 2010 - Abstracts from the ASEG-PESA Airborne Gravity 2010 Workshop: Published jointly by Geoscience Australia and the Geological Survey of New South Wales, Geoscience Australia Record 2010/23 and GSNSW File GS2010/0457.
Lee, J. B. 2001. FALCON gravity gradiometer technology. Exploration Geophysics, 32, 247-250.
Lumley, J. M., White, J. P., Barnes, G., Huang, D., Paik, H. J., 2004, A superconducting gravity gradiometer tool for exploration, in R.J.L. Lane, editor, Airborne Gravity 2004 - Abstracts from the ASEG-PESA Airborne Gravity 2004 Workshop: Geoscience Australia Record 2004/18, 1-12.
van Leeuwen, E. H., McCracken, K.G., Lee, J. B. and Turner, R. J. 2005, Airborne gravity gradiometer: U. S. Patent 6 883 372B2.

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Article Type: Research Article

Keyword(s): airborne gravity gradiometry; gravity gradient

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