Seismic Imaging of the Subsurface at the Malmberget Iron Ore Mine, Northern Sweden

Summary Reflection seismic data were acquired along three profiles in the Malmberget area in northern Sweden during the time period 2 to 9 November, 2019. The aims of the survey were to identify structures in the upper 1 km of crust and to map potential fracture zones or zones of weakness in the bedrock related to ground deformation and induced seismicity. Gently dipping reflections are imaged along all 3 lines down to about 600-700 m. Deeper reflections, down to 2 km, are also observed along some portions of the lines. Breaks in the patterns in these reflections indicate where fracture zones may be present. Future dedicated boreholes with geophysical logging and seismic measurements in them are required to verify the interpretation.