Pulled Array Continuous Vertical Electrical Sounding (Pa-Cites) With An Additional Inductive Source.

Electrical and electromagnetic profiling methods are used extensively in environmental<br>geophysical investigations for many different purposes. The PA-CVES method (Pulled-<br>Array Continuous Vertical Electrical Sounding), where a tail of electrodes is towed behind<br>a small vehicle while continuously measuring in many electrode configurations, has been<br>used extensively for mapping the vulnerabilty of aquifers. Measurements are done for<br>every 1 metre and lo-15 km of profile can be made in one day.<br>This paper presents a theoretical study of the resolution capabilities of PA-CVES<br>measurements, as they are now performed, and an experimental design study for<br>including an inductive source in the measuring equipment. The joint interpretation of the<br>galvanic data set of ordinary PA-CVES measuements and a small number of induc.tive<br>data from a horizontal magnetic dipole source will significantly enhance the resolution<br>capabilities of the data set.<br>The study is carried out by analyzing the uncertainty of the model parameters of a onedimensional<br>three layer model using the covariance matrix of the inversion problem.