International Journal of Geosciences, 2011, 2, 373-387 doi:10.4236/ijg.2011.23040 Published Online August 2011 (http://www.SciRP.org/journal/ijg) Lineaments Extraction from Gravity Data by Automatic Lineament Tracing Method in Sidi Bouzid Basin (Central Tunisia): Structural Framework Inference and Hydrogeological Implication Hajer Azaiez1*, Hakim Gabtni1, Imen Bouyahya1, Dorra Tanfous2, Soumaya Haji3, Mourad Bedir1 1Laboratoire de Géoressources, Centre de Recherches et des Technologies des Eaux, Technopôle Borj-Cedria, Soliman, Tunisia 2Institut Préparatoire aux Etudes d’Ingénieur de Bizerte, Zarzouna, Bizerte, Tunisia 3Laboratoire 3E, Ecole nationale des ingénieurs de Sfax, Route de Soukra Km 4, Sfax, Tunisia E-mail:
[email protected] Received Feburary 2, 2011; revised May 11, 2011; accepted June 24, 2011 Abstract The gravity method may be used in the exploration of deep sedimentary basins. It allows the structuring and the lateral and vertical extent of sedimentary fill to be determined. This study has concerned a qualitative and quantitative gravity analysis of Sidi Bouzid Basin in Central Tunisia. Bouguer anomaly analysis and Gravity data filtering allow us to emphasize the structures affecting the basin. The Automatic Lineament Tracing method helps to quantify the different gravity responses of faults located in the shallow and deep sedimen- tary sections and in the basement. The elaborated structural map of the study area constitutes a useful docu- ment for rationalizing the future groundwater exploration in the arid area of central Tunisia since it shows faults dipping and deep hydrogeologic sub-basin delineation. Keywords: Gravity, Lineaments, Extraction, Tunisia, Hydrogeology 1. Introduction The gravity survey method was selected as the geo- physical method that would give a regional picture of the The Sidi Bouzid Basin, situated in central Tunisia (Fig- subsurface geology before making extensive surveys by ure 1), is characterized by a Mediterranean semi-arid to the seismic reflexion method.