Issues related to determination of the horizontal centre of magnetization

Blair McKenzie; Clive Foss; Dean Hillan

doi:10.1071/ASEG2012ab334

ISSN: 2202-0586
E-ISSN:

oa Issues related to determination of the horizontal centre of magnetization
Authors Blair McKenzie^a, Clive Foss^b and Dean Hillan^c
View Affiliations Hide Affiliations

^a Tensor Research, PO Box 8159 Greenwich NSW 2065, [email protected] ^b CSIRO Earth Science & Resource Engineering, North Ryde, [email protected] ^c CSIRO Earth Science & Resource Engineering, North Ryde, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab334
- Published online: 01 Dec 2012

Abstract

Summary

The direction of magnetization of a compact source causing a magnetic field anomaly can be found without concern for the details of its shape using magnetic moment analysis (MMA). This provides assistance in the successful inversion of magnetic anomalies due in part to remanent magnetization of unknown direction. However, the success of MMA is dependant on the analysis being positioned appropriately over the horizontal centre of the source body. MMA itself can derive an estimate of the horizontal centre of magnetization and in this presentation we investigate the conditions for stable convergence of an iterative solution that progressively steps the analysis to a revised horizontal centre of magnetization. We find that reliable magnetization directions can be recovered for grid widths down to twice the source depth and less. One, or at most two iterations of the analysis should locate the horizontal centre of magnetization over a compact source to within 5% of its depth and with a resulting uncertainty in magnetization direction of the order of 5°.

Article metrics loading...

/content/journals/10.1071/ASEG2012ab334

2012-12-01

2026-01-14

From This Site

/content/journals/10.1071/ASEG2012ab334

dcterms_title,dcterms_subject,pub_keyword

-contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution

10

5

Full text loading...

References

Caratori Tontini, F. and Pedersen, L. B., 2008, Interpreting magnetic data by integral moments: Geophysical Journal International, 174, 815-824.
Foss, C.A. and McKenzie, K.B., 2011a, Inversion of anomalies due to remanent magnetization: an example from the Black Hill Norite of South Australia: Australian Journal of Earth Sciences, 58, 391-405.
Foss, C.A. and McKenzie, K.B., 2011b, Strategies to model a suite of remanent magnetization anomalies: Exploration Geophysics (submitted).
Foss, C.A., Schmidt, P.W., Milligan, P., Musgrave, R., 2012, A web-based utility to highlight the role of remanent magnetization in Australian magnetic field data.: ASEG Conference Extended abstract (this volume).
Helbig, K.,1963, Some integrals of magnetic anomalies and their relationto the parameters of the disturbing body: Zeitschrift fur Geophysik, 29, 83-96.
Medeiros, W.E. and Silva, J. B. C., 1995, Simultaneous estimation of total magnetization direction and spatial orientation: Geophysics, 50, 1365-1377.
Phillips, J. D., 2005, Can we estimate magnetization directions from aeromagnetic data using Helbig’s integrals?: Earth Planets Space, 57, 681-689.
Phillips, J.D.,Nabighian, M.N., Smith, D. V., and Li, Y., 2007, Estimating locations and total magnetization vectors of compact magnetic sources from scalar, vector, or tensor magnetic measurements through combined Helbig and Euler analysis: SEG Extended abstract, 770-774.
Schmidt, P. W. and Clark, D. A., 1998, The calculation of magnetic components and moments from TMI: A case study from the Tuckers Igneous Complex, Queensland: Exploration Geophysics, 29, 609-614.

/content/journals/10.1071/ASEG2012ab334

Article Type: Research Article

Keyword(s): centre of magnetization; magnetic moment; magnetization direction; remanent magnetization

Most Cited This Month Most Cited RSS feed

- Inversion of data from electrical imaging surveys in water-covered areas
  
  Authors M. H. Loke and J. W. Lane
- Inversion of Magnetic Data from Remanent and Induced Sources
  
  Authors Robert G. Elllis, Barrry de Wet and Ian N. Macleod
- A comparison of smooth and blocky inversion methods in 2-D electrical imaging surveys
  
  Authors M. H. Loke, Ian Acworth and Torleif Dahlin
- Designing matched bandpass and azimuthal filters for the separation of potential-field anomalies by source region and source type
  
  Authors Jeffrey D. Phillips
- Bad Colour Maps Hide Big Features and Create False Anomalies
  
  Authors Peter Kovesi
- Practical 3D EM inversion – the P223F software suite
  
  Authors Art Raiche, Fred Sugeng and Glenn Wilson
- Estimating Noise Levels in AEM Data
  
  Authors Andy Green and Richard Lane
- Target delineation using Full Tensor Gravity Gradiometry data
  
  Authors Colm A. Murphy and James Brewster
- Transdimensional Monte Carlo Inversion of AEM Data
  
  Authors Ross C Brodie and Malcolm Sambridge
- The geotech VTEM time domain helicopter em system
  
  Authors Ken Witherly, Richard Irvine and Edward Morrison
More Less

oa Issues related to determination of the horizontal centre of magnetization

Abstract

Most Read This Month

Most Cited This Month Most Cited RSS feed