Abstract
A geophysical project was developed in Cerritos area, near Pereira city, where gravity, magnetic, electrical and seismic data were acquired over a 210.75 km 2 area. The data were processed and interpreted according the geological information acquired and also available; as result a free to confined aquifer was defined in the Plio-Pleistoce Pereira formation (Tqp), that is characterized by non-homogeneous lateral layers and constituted by a superior sequence of volcanic ashes and an inferior of volcano-clastic flows which reaches 750 m thick. The Pereira fm is controlled by the tectonic controlled Cartago and Barroso formations, with inverse faults that indicate uplift of the basement and variations of the Pereira formation thick, affecting the underwater circulation system and expressed by variations in the electric resistivity of the subsoil.
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