CHARACTERIZING LINEAMENTS FROM SATELLITE IMAGES AND FIELD STUDIES IN THE CENTRAL EBRO BASIN (NE SPAIN)

In the central part of the Ebro basin, filled with Neogene beds, more than 6000 lineaments have been mapped at a 1 : 100000 scale, using a c ombination of bands 2, 4 and 7 of the Landsat Thematic Mapper (TM). Wi th an automatic exploration program, geometric features of the lineame nt population were analysed, identifying four sets of lineaments trend ing NW-SE, ESE-WNW, NNE-SSW and NE-SW. Field studies reveal that most lineaments are normal faults. The highest density lies over a lax NW-t rending syncline, where the Tertiary thickness is lower and the baseme nt shows NW-trending faulting. It is thus concluded that the lineament s developed as a result of cover deformation above large basement faul ts.