Semblance filtering of airborne potential field data

Asbjorn N. Christensen

doi:10.1071/ASEG2003ab024

ISSN: 2202-0586
E-ISSN:

oa Semblance filtering of airborne potential field data
Authors Asbjorn N. Christensen^a
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^a BHP Billiton Minerals Exploration,, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue ASEG2003 - 16th Geophysical Conference, Aug 2003, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2003ab024
- Published online: 01 Aug 2003

Abstract

Airborne Gravity Gradiometer (AGG) data and Total Magnetic Intensity (TMI) data are acquired simultaneously by the BHP Billiton FALCON� system. An important step in the joint interpretation of AGG and TMI data is to identify and discriminate geological structures from the geophysical signatures in the data sets. Hence, the local similarity - or lack thereof -between the AGG and the TMI data is an important clue in the geological interpretation of the data. A spectral semblance filter computes the resemblance of the two data sets individually for each wave number in the Fourier domain. Spectral semblance filtering enables the interpreter to separate and isolate events that are coherent in two different data sets, such as gravity and magnetic.

An example, using data from a FALCON� survey over the Hardey Syncline in the Hamersley Basin, demonstrates the use and the advantages of the spectral semblance filtering of airborne potential fields data.

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2026-01-13

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References

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Article Type: Research Article

Keyword(s): airborne geophysical survey; banded iron-formations; filtering; potential fields; semblance

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oa Semblance filtering of airborne potential field data

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