Deep Resistivity Tomographic Imaging of The Qualibou Caldera, Saint Lucia

Abstract

The Qualibou Caldera has been studied since the 1970’s for possible development of geothermal power generation. In 1974 dipole-dipole resistivity measurements were performed in the area. The apparent resistivity data was plotted as contours and a single line running through Sulphur Springs was interpreted by using forward models to generate a best fit model. The data is reanalyzed using a robust 2D inversion method. The result shows a resistive body beneath Sulphur Springs, the presence of which has been debated for nearly thirty years. The data from all 2D tomograms is interpolated into 3D, which generates images showing conductive features reminiscent of hydrothermal convection plumes.