Summary
This study employed Ground Penetrating Radar (GPR) to investigate subsurface geological features in the Brumunddal area, central Norway, focusing on regions affected by post-glacial seismicity and landslides. Using a central frequency of 100 MHz provided a balance between penetration depth and resolution, enabling mapping of subsurface features located in up to 22.5 meters depth in Hestbekken, Åsdal, and Mælumsætra NE, and up to 27.5 meters in Putten and Skreppåsen. The results revealed variable geological conditions, with some profiles exhibiting more favourable electromagnetic properties in landslide deposits, indicated by stronger and more continuous reflections. However, this correlation was not always consistent. Furthermore, profiles in Hestbekken, showed both weak and strong reflectivity beneath bog, reflecting different water saturation levels. While Åsdal profiles correlated strong reflectivity within landslide materials, Mælumsætra NE showed both distinct and weak reflectors. Additionally, the investigations in Putten and Skreppåsen highlighted the influence of surface conditions on the GPR measurements, and indications of potential faulting in profile S1. Overall, the findings emphasize the importance of considering local geological factors in interpreting GPR data, with potential for further insights through ground truth methods like drilling.
