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Identification of deep magnetized structures in the tectonically active Chlef area (Algeria) from aeromagnetic data using wavelet and ridgelet transforms

The Chlef region constitutes a key area to study neotectonics structures and their geodynamical context. Aeromagnetic data analyzed using different processing methods (shaded relief technique, computation of vertical gradient, upward continuation, use of the continuous wavelet transform and ridgelet...

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Bibliographic Details
Published in:Journal of applied geophysics 2018-07, Vol.154, p.167-181
Main Authors: Boukerbout, H., Abtout, A., Gibert, D., Henry, B., Bouyahiaoui, B., Derder, M.E.M.
Format: Article
Language:English
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Summary:The Chlef region constitutes a key area to study neotectonics structures and their geodynamical context. Aeromagnetic data analyzed using different processing methods (shaded relief technique, computation of vertical gradient, upward continuation, use of the continuous wavelet transform and ridgelet transform), allow establishing a structural image of emerging and deep structures both onshore and offshore. Magnetic anomalies, over the Mediterranean Sea, the Chlef basin and the Ouarsenis Mounts, are well-correlated with the known geological structures. Long and short wavelength anomalies have been distinguished. The short wavelength anomalies are associated with the volcanic rocks on the coast from Chenoua to El Marsa and with the basement in the Boukadir zone in the sedimentary Chlef basin. The long wavelength anomalies to the South are associated mainly with deep E-W structures, limiting the Chlef basin. To the North, similar structures have been identified in the Mediterranean Sea. The compilation of the identified magnetic features leads to geometrical shape corroborating the structure in blocks of the Chlef basin. •An aeromagnetic study of the seismically Chlef region is achieved.•Different processing methods are used to highlight short and long wavelengths.•The deep E-W structures limiting the area are identified.•2-D and 3-D images of emerging and deep structures both onshore and offshore are done.•A correlation between geology, seismicity and identified structures is done.
ISSN:0926-9851
1879-1859
DOI:10.1016/j.jappgeo.2018.04.026