Atividade neotectônica na borda norte da Bacia do Araripe-ce: evidências a partir de índices morfométricos

Abstract

The current paper used digital elevation model from Shuttle Radar Topography Mission (SRTM) to extract morphometric data in order to locate terrains that could have been influenced by tectonics events in the north of Araripe Basin – CE. Drains and sub-basins were extracted and they allowed the application of the following morphometric indexes: Stream Length-Gradient Index (SL Index), Drainage Basin Asymmetry (AF), Mountain Front Sinuosity (SMF) and Hypsometric Integral (HI). The resultant indexes were converted into a class of tectonic intensity in order to calculate the index of relative active tectonics (IAT). The result indicated a moderate tectonic activity area in most of the sub-basins. Five out of twenty-one sub-basins presented high values and three of them were related to Santana do Acaraú Valley, that may have been formed due to those events.