Definitive SPM identification through spatial, temporal and amplitude analysis of airborne EM data

Macnae, J 2015, 'Definitive SPM identification through spatial, temporal and amplitude analysis of airborne EM data', in R. V. Schneider (ed.) Proceedings of the 2015 SEG Technical Program (Expanded Abstracts), New Orleans, United States, 18-23 October 2015, pp. 2027-2031.


Document type: Conference Paper
Collection: Conference Papers

Title Definitive SPM identification through spatial, temporal and amplitude analysis of airborne EM data
Author(s) Macnae, J
Year 2015
Conference name SEG International Exhibition and Annual Meeting
Conference location New Orleans, United States
Conference dates 18-23 October 2015
Proceedings title Proceedings of the 2015 SEG Technical Program (Expanded Abstracts)
Editor(s) R. V. Schneider
Publisher Society of Exploration Geophysicists
Place of publication United States
Start page 2027
End page 2031
Total pages 5
Abstract Several recent papers have used decay characteristics to predict and map the presence of superparamagnetic (SPM) responses in airborne EM data. Because the most common cause of SPM is irregularly distributed weathering products in the near surface, the majority of SPM anomalies appear as small amplitude responses with short spatial wavelength variations. Even if a significant area of SPM is present, short spatial variations are common. This paper suggests that a combination of small amplitude, characteristic SPM decay shape and short spatial wavelength is unambiguously characteristic of SPM. As a result, there is no need to use two vertically offset receivers to identify SPM with certainty.
Subjects Electrical and Electromagnetic Methods in Geophysics
Signal Processing
Keyword(s) electromagnetic
airborne survey
magnetic susceptibility
interpretation
filtering Read More: http://library.seg.org/doi/abs/10.1190/segam2015-5852566.1
DOI - identifier 10.1190/segam2015-5852566.1
Copyright notice © 2015 Society of Exploration Geophysicists
ISSN 1949-4645
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