Near Surface Case Studies Using RMT Measurements in Sweden

Four examples from the radiomagentotelluric (RMT) measurements in Sweden are selected to present application of the method in the near surface studies. Detection and mapping the details of a low resistivity water-bearing fracture zone in resistive crystalline bedrock is shown in the first example. Estimation of the depth and lateral extension of hazardous sulphidic sediments is the aim in second example. Results of 2D inversion of RMT data along a profile show that the contaminated sediments are considerably less resistive than the surrounding sediments. Use of RMT method in the engineering investigation at a bridge construction site where the modelled overburden thicknesses are in good agreement with those determined by the geotechnical tests is presented in the third example. At the end the results from RMT measurements with the purpose of mapping the depth extent of a resistive and homogeneous reef limestone that has a variety of industrial use are presented.