1887
  1. Home
  2. A-Z Publications
  3. Geophysical Prospecting
  4. Volume 67, Issue 6
  5. Article
Volume 67 Number 6
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

For airborne gravity gradiometry in rugged terrain, helicopters offer a significant advantage over fixed‐wing aircraft: their ability to maintain much lower ground clearances. Crucially, this provides both better signal‐to‐noise and better spatial resolution than is possible with a fixed‐wing survey in the same terrain. Comparing surveys over gentle terrain at Margaret Lake, Canada, and over rugged terrain at Mount Aso, Japan, demonstrates that there is some loss of spatial resolution in the more rugged terrain. The slightly higher altitudes forced by rugged terrain make the requirements for terrain correction easier than for gentle terrain. Transforming the curvature gradients measured by the Falcon gravity gradiometer into gravity and the complete set of tensor components is done by a Fourier method over gentle terrain and an equivalent source method for rugged terrain. The Fourier method is perfectly stable and uses iterative padding to improve the accuracy of the longer wavelengths. The equivalent source method relies on a smooth model inversion, and the source distribution must be designed to suit the survey design.

© 2019 European Association of Geoscientists & Engineers © 2018 European Association of Geoscientists & Engineers
Loading

Article metrics loading...

/content/journals/10.1111/1365-2478.12736
2019-01-09
2024-04-23

  • From This Site

    /content/journals/10.1111/1365-2478.12736
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. BarnesG.J. and LumleyJ.M.2011. Processing gravity gradient data. Geophysics76, 133–I47.
     [Google Scholar]
  2. BlakelyR.J.1996. Potential Theory in Gravity and Magnetic Applications. Cambridge University Press.
     [Google Scholar]
  3. BoggsD.B., MaddeverR.A.M., LeeJ.B., TurnerR.J., DowneyM.andDransfield M.H.2007. First test survey results from the Falcon helicopter‐borne airborne gravity gradiometer system. Preview126, 26–28.
     [Google Scholar]
  4. ChristensenA.N. and HodgesG.2013. HeliFalcon Gravity gradiometer data acquisition in rugged terrain. Proceedings of the 11th SEGJ International Symposium, Yokohama, Japan, 18–21 November 2013.
  5. CordellL.1992. A scattered equivalent source method for interpolation and gridding of potential field data in three dimensions. Geophysics57, 629–636.
     [Google Scholar]
  6. DampneyC.N.G.1969. The equivalent source technique. Geophysics34, 39–53.
     [Google Scholar]
  7. DransfieldM.H.2007. Airborne gravity gradiometry in the search for mineral deposits. Exploration in the New Millennium: Proceedings of Exploration 07, Fifth Decennial International Conference on Mineral Exploration (ed. B.Milkereit), pp. 341–354. Decennial Mineral Exploration Conferences.
  8. DransfieldM.H.2010. Requirements for airborne gravity gradient terrain corrections. 21st Geophysical Conference. ASEG Extended Abstracts 2010.
  9. DransfieldM.H. and ChristensenA.N.2013. Performance of airborne gravity gradiometers. The Leading Edge32, 908–922.
     [Google Scholar]
  10. DransfieldM.H. and LeeJ.B.2004. The Falcon airborne gravity gradiometer survey systems. Airborne Gravity 2004 – Abstracts from the ASEG‐PESA Airborne Gravity 2004 Workshop: Geoscience Australia Record 2004/18 (ed. R. J. L.Lane), pp. 15–19. Geoscience Australia.
  11. DransfieldM.H. and ZengY.2009. Airborne gravity gradiometry: Terrain corrections and elevation error. Geophysics74(5), I37–42.
     [Google Scholar]
  12. GuspiF.1987. Frequency‐domain reduction of potential field measurements to a horizontal plane. Geoexploration24, 87–98.
     [Google Scholar]
  13. HansenR.O. and MiyazakiY.1984. Continuation of potential fields between arbitrary surfaces. Geophysics49, 787–795.
     [Google Scholar]
  14. HodgesG., DransfieldM.H. and SheiT.2010. The Falcon airborne gravity gradiometer for engineering applications. 23rd EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 11–15 April 2010, Keystone, CO, USA.
  15. LeeJ.B.2001. Falcon gravity gradiometer technology. Exploration Geophysics32, 75–79.
     [Google Scholar]
  16. LiY. and OldenburgD.W.1996. 3‐D inversion of magnetic data. Geophysics61, 394–408.
     [Google Scholar]
  17. LiY., NabighianM., and OldenburgD.W.2014. Using an equivalent source with positivity for low‐latitude reduction to the pole. Geophysics79(6), J81–J90.
     [Google Scholar]
  18. ShimadaT., TakaiK., MiyakeK., HisataniK. and ToshaT.2015. Airborne Survey by a helicopter for evaluation of geothermal resources. Proceedings of World Geothermal Congress 2015, New Zealand.
  19. Van LeeuwenE.H.2000. BHP develops airborne gravity gradiometer for mineral exploration. The Leading Edge19, 1296–1297.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.1111/1365-2478.12736
Loading
Heli‐borne gravity gradiometry in rugged terrain
Geophysical Prospecting 67, 1626 (2019); https://doi.org/10.1111/1365-2478.12736
/content/journals/10.1111/1365-2478.12736
/content/journals/10.1111/1365-2478.12736
Loading

Data & Media loading...

  • Article Type: Research Article
Keyword(s): Acquisition; Airborne gravity gradiometry; Data processing; Gravity; Rotary wing; Rugged terrain; Spatial resolution

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error