Enhancement of Fault Anomalies by Application of Steerable Filters: Application to Aeromagnetic Map of Part of Ifewara Fault Zone, Southwestern Nigeria
Title:
Enhancement of Fault Anomalies by Application of Steerable Filters: Application to Aeromagnetic Map of Part of Ifewara Fault Zone, Southwestern Nigeria
Author:
G.C. Onyedim
Appeared in:
Journal of applied sciences
Paging:
Volume 7 (2007) nr. 2 pages 214-219
Year:
2007
Contents:
Subtle potential-field signatures of brittle faults and fractures necessitate detailed data processing, using a wide variety of anomaly-enhancement techniques and display parameters. As a class of oriented linear filters, steerable filters are used in many vision and image processing tasks such as edge detection, textural analysis, motion analysis and pattern recognition. In this study, steerable filters were applied in six different azimuth directions to enhance magnetic anomalies due to faults in part of the basement complex of southwestern Nigeria. Unlike the original unfiltered image, the filtered images facilitated easy delineation of linear features which were interpreted as fractures in the area. The major fracture directions identified were NNE-SSW, NE-SW, NW-SE and ENE-WSW. The NNE-SSW trending Ifewara fault shows clearly as a fault zone.
Publisher:
Asian Network for Scientific Information, Pakistan (provided by DOAJ)
Journal description