Abstract

MATIZ-LEON, Jhon Camilo; RODRIGUEZ-RODRIGUEZ, Gilbert  and  ALFARO-VALERO, Claudia. Ground temperature model from shallow soundings and remote sensing for geothermal area of Paipa, Boyacá-Colombia. bol.geol. [online]. 2019, vol.41, n.2, pp.71-88.  Epub May 30, 2019. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v41n2-2019004.

Temperature models were generated from Shallow Temperature Surveys (SST) and Remote Sensing (SR) with Landsat 8 TIRS images for Paipa geothermal area. The temperature range at 20 cm depth fluctuates between 17.04°C and 19.14°C. At 150 cm depth, the temperature values range from 16.81°C to 19.66°C. The normalization of the temperature values in depth (20 cm and 150 cm) as a function of the surface temperature eliminates the effect of the solar radiation and allows to compare the temperatures calculated with SR both in surface and depth. Pearson correlation coefficient measure shows that there are mostly negative correlations in depth (-0.1955) and some positive surface correlations (0.3125) between SST and SR anomaly maps. In turn, an analysis of uranium (38U) (0 ppm and 205.7 ppm), thorium (32Th) (0.6 ppm and 94.2 ppm) and potasio (40K) (0% and 11.8%) anomalies by gamma ray spectrometry, topography (between 2500 mals and 3200 mals) and the estimated temperature anomalies, finding highs and lows with spatial matching between the variables.

Keywords : Geothermal exploration; shallow temperatures surveys; remote sensing; digital processing of satellite images; geostatistics; Pearson..

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