Abstract

JARAMILLO GIRALDO, Erika Cristina; VEGA MANCHOLA, Ximena  and  MONSALVE JARAMILLO, Hugo. APPLICATION OF GRAVIMETRY AND ELECTRIC TOMOGRAPHY METHODS TO OBTAIN STRATIGRAFIC PROFILES: CASE STUDY AT UNIVERSITY OF QUINDÍO AND PUERTO ESPEJO AREA, ARMENIA-COLOMBIA . Earth Sci. Res. J. [online]. 2005, vol.9, n.2, pp.73-84. ISSN 1794-6190.

The methodology used to develop resistivity and gravimetry geophysical surveying applied to the sub-surface is described. These are totally indirect methods whose purpose is to determine the density and resistivity contrasts in the sub-surface, in order to relate them with the different types of soils in the areas of study, located South and North In Armenia- Quindío (Puerto espejo and University of Quindío respectively), to determine the geometry of longitudinal profiles based on existing geotechnical boreholes which only provide unidimensional information.The importance of sub-surface is analyzed, using electric resistivity and gravimetry methods in Civil Engineering projects. The most important factors influencing the changes in electric resistivity and gravimetry values for differerent geological materials are also analyzed, as well as the ranges of variation of these values, depending on climate conditions and formation of layers in each area of study.For the electric tomography, the electrodic array Wenner -Schlumberger is used due to its high vertical and horizontal resolution. For the gravimetric method, the microgravimetry technic is used because this allows better detail in shallow layers of the sub- surface.Results obtained are presented in electric and gravimetric profiles in Puerto Espejo and University of Quindío , which are useful as calibration parameters of resistivity and gravity ranges for the types of soils found in these areas in Colombia, depending also on the humidity and temperature factors. The analysis and discussion of results is what finally permits to obtain conclusions, important for choosing the methods of geophysical exploration as an alternative to get familiar with the structures located in the sub-surface .

Keywords : Gravimetry; electric tomography; stratigrafic profiles; volcaniclastic fan; scarp; Armenia (Colombia).

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