Electrical resistivity and refraction seismic data acquisition over a segment of the Møre-Trøndelag Fault Complex
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The Møre-Trøndelag Fault Complex (MTFC) is a key structural element in mid-Norway. 2D resistivity profiling and shallow refraction seismics have been carried out to resolve the near surface structures of the fault in the area of Tingvollfjorden. Here two of the main segments of the MTFC are evidenced by the topography (Tjellefjorden Fault and Fannefjorden Fault). In total a series of seven resistivity profiles and one refraction profile will be presented in this report. The resistivity profiles reveal very low resistive zones in the bedrock. The geometries of the low resistivity zones strongly suggest a highly fractured bedrock. Along one of the resistivity profiles, additionally a shallow refraction seismic profile was conducted. In addition, the refraction profile shows three distinct low velocity anomalies in the bedrock, which might relate to damage zones of the MTFC. Comparison between the 2D resistivity and refraction seismic shows that two weak zones correlate, while the third velocity zone is probably artifact.