2.5D ERT Survey in Oslo Harbor - Medieval Heritage in an Urban Development Area

Four ERT profiles have been acquired in the Bjørvika area in Oslo in order to reveal resistivity anomalies that could correspond to archaeologically interesting timber objects. The data has been processed and analyzed with three different inversion softwares, and both two- and three-dimensional resistivity models have been generated. The different 2D profiles as well as the 3D models were in good agreement, and anomalies located by the ERT survey were excavated and proven to correspond to buried concrete structures. The pinpointing capabilities, correctness and resolution of the different inversion methods have been elucidated.