A014 MONITORING OF A GROUNDWATER TRACER USING RADIOMAGNETOTELLURICS (RMT) Summary 1 In autumn 2002 a large amount of saltwater was injected into a shallow unconfined aquifer for a period of 7 days. The experiment was accompanied by extensive geophysical monitoring for 10 weeks before during and after the injection. Radiomagnetotelluric field data display a conducting anomaly progressing with the groundwater flow. A comparable anomaly appears in the conductivities determined by groundwater probing. The RMT data have been interpreted using a two-dimensional magnetotelluric inversion code. Inversion results supply detailed information on the heterogeneous geological structure of the aquifer and reveal a


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