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| | Abstract | | The small-loop electromagnetic method is increasingly used for shallow environmental and engineering surveys. The instruments require an accurately calibrated receiver coil to measure the secondary magnetic field in the presence of the dominant primary field. Our experience shows that there are many cases where the data are not accurate enough to justify quantitative interpretation. We present an inversion approach that allows a correction for the offset errors and also construct multidimensional resistivity model. The key point is that the data are acquired at two different heights. The synthetic and field data examples demonstrate that the inversion recovers reliable resistivity models from multifrequncy data that are severely contaminated with offset errors. |
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