Roll-along Inversion – A New Approach for Very Long Dc Resistivity Profiles

In some cases elongated dc resistivity profiles are measured either continuous or by a roll-along technique. The interpretation in one step is usually a time consuming numerical task with large memory requirements. We present a new approach for a subsequent solution using segmentation and sophisticated constraints. It proves to be very efficient for large segment numbers and can be used on standard pc's. We show two field data examples: First, data from a flood-protection measured with the roll-along technique are treated. Thus it is possible to distinguish cohesive and sandy zones in the dike as well as in the substratum. The second examples uses data collected by a sea-bottom towed multi-electrode cable with continuous data acquisition. The result provides valuable insight into the sedimentation structures.