Designing matched bandpass and azimuthal filters for the separation of potential-field anomalies by source region and source type

Jeffrey D. Phillips

doi:10.1071/ASEG2001ab110

ISSN: 2202-0586
E-ISSN:

oa Designing matched bandpass and azimuthal filters for the separation of potential-field anomalies by source region and source type
Authors Jeffrey D. Phillips^a
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^a U.S. Geological Survey, , United States, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab110
- Published online: 01 Dec 2001

Abstract

Matched bandpass filtering of potential-field data, based on a multi-layer equivalent source model, provides a useful way to separate short-wavelength anomalies that originate at shallow depths from long-wavelength anomalies that generally originate at greater depths. Matched azimuthal filtering is a new concept that can be used in conjunction with the bandpass filtering to suppress directional noise or to enhance directional signal. An implementation of matched bandpass and azimuthal filtering using multiple equivalent-source layers is demonstrated on aeromagnetic data collected over the Albuquerque basin, New Mexico, USA.

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2001-12-01

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References

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Grauch, V.J.S., Hudson, M.R., and Minor, S.A, 2001, Aeromagnetic expression of faults that offset basin fill, Albuquerque basin, New Mexico: Geophysics, 66, in press.
Phillips, J.D., 1997, Potential-field geophysical software for the PC, version 2.2: U.S. Geological Survey Open-File Report 97-725, (ftp://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-97-0725/pfofr.htm).
Ridsdill-Smith, T.A., 1998, Separating aeromagnetic anomalies using wavelet matched filters: 68th Annual International Meeting, Society of Exploration Geophysicists, Expanded Abstracts, 550-553, (http ://wavelet.freeservers .com/papers/Wavseg98 .zip).
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Spector, A., 1968, Spectral Analysis of Aeromagnetic Maps: Ph.D. thesis, Dept. of Physics, University of Toronto.
Spector, A., and Grant, F., 1970, Statistical models for interpreting aeromagnetic data: Geophysics, 35, 293-3302.
Syberg, F.R.J., 1972, A Fourier method for the regional-residual problem of potential fields: Geophysical Prospecting, 20, 47-75.
U.S. Geological Survey, Sander Geophysics, Ltd., and Geoterrex, 1999, Digital data from the Sandoval-SantaFe, Belen, and Cochiti aeromagnetic surveys, covering areas in Sandoval, Santa Fe, Rio Arriba, Valencia, and Socorro Counties, New Mexico: U.S. Geological Survey Open-File Report 99-404, CD-ROM.

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Article Type: Research Article

Keyword(s): Aeromagnetic; Algorithms; Filtering; Gravity; Potential-field

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