A brief analysis of ZTEM data from the Forrestania test site, WA

Daniel Sattel; Ken Witherly; Michael Becken

doi:10.1081/22020586.2010.12041962

ISSN: 2202-0586
E-ISSN:

oa A brief analysis of ZTEM data from the Forrestania test site, WA
Authors Daniel Sattel^a, Ken Witherly^b and Michael Becken^c
View Affiliations Hide Affiliations

^a EM Solutions, , USA, [email protected] ^b Condor Consulting, Inc., , USA, [email protected] ^c GFZ Potsdam, , Germany, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12041962
- Published online: 01 Dec 2010

Abstract

Summary

ZTEM is a helicopter-borne AFMAG system that measures the magnetic-field response in the frequency range 25-600 Hz of naturally occurring currents in the subsurface. The resolution of this system is analyzed by forward modeling and inverting synthetic ZTEM data using a 2D algorithm for a range of conductivity scenarios.

ZTEM data acquired at the Forrestania test site are compared with overlapping VTEM data. Conductivitydepth sections derived from both data sets show broad agreement, but indicate better spatial resolution for the VTEM data. The response due to bedrock conductor IR2 is strong for the VTEM system and subtle on the ZTEM profiles, which appear to be dominated by responses to larger, elongated structures. Products derived from the ZTEM data, including apparent conductivity, phase and Karous-Hjelt filtered grids appear to map geologic structure, complementing the information gathered from the VTEM data.

Article metrics loading...

/content/journals/10.1081/22020586.2010.12041962

2010-12-01

2026-01-21

From This Site

/content/journals/10.1081/22020586.2010.12041962

dcterms_title,dcterms_subject,pub_keyword

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

10

5

Full text loading...

References

Becken M., and Pedersen L.B., 2003, Transformation of VLF anomaly maps into apparent resistivity and phase: Geophysics 68, 497-505.
DeGroot-Hedlin, C. and S. Constable, 1990, Occam’s inversion to generate smooth two-dimensional models from magnetotelluric data: Geophysics 55, 1613-1624.
De Lugao, P.P., and Wannamaker, P., 1996, Calculating the two-dimensional magnetotelluric Jacobian in finite elements using reciprocity, Geophys. J. Int., 127, 806-810.
Karous, M., and Hjelt, S.E., 1983, Linear filtering of VLF dipangle measurements: Geophysical Prospecting 31, 782-794.
Legault, J.M., Kumar, H., Milicevic, B., and Hulbert, L., 2009, ZTEM airborne tipper AFMAG test survey over a magmatic copper-nickel target at Axis Lake in northern Sakatchewan: 79th International Exposition and Annual Meeting, SEG, Expanded Abstracts, 1272-1276.
Pedersen L.B., Qian, W., Dynesius, L., and Zhang P., 1994, An airborne tensor VLF system. From concept to realization: Geophysical Prospecting 42, 863-883.
Wannamaker, P.E., Stodt, J.A., and Rijo, L., 1987, A stable finite-element solution for two-dimensional magnetotelluric modeling: Geophysical Journal of the Royal Astronomical Society, 88, 277-296.
Witherly, K., and Irvine, R., 2007, Mapping targets of high conductance with the VTEM airborne EM system: 19th International Geophysical Conference and Exhibition, ASEG, Extended Abstracts.

/content/journals/10.1081/22020586.2010.12041962

Article Type: Research Article

Keyword(s): AFMAG; airborne electromagnetics; EM data modeling; inversion; natural-field EM.

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 A brief analysis of ZTEM data from the Forrestania test site, WA

Abstract

Most Read This Month

Most Cited This Month Most Cited RSS feed