Mapping Buried Fault Zones in a Granitic Pluton Using Aeromagnetic Data

Abstract Globally, the largest geothermal resources are linked to crystalline basement, which could be exploited using Enhanced Geothermal Systems (EGS). The planned underground laboratory GeoLaB aims facilitate large-scale application of EGS technologies by performing in-situ high-flowrate experiments on fault zones. Tromm Granite at northwestern margin Upper Rhine Graben was preselected as one two potential sites for GeoLaB. To improve understanding natural network in target area, a drone-based aeromagnetic survey conducted March 2022, covering an area about 13.3 km 2 center pluton. A selection eight filters enhance signal tested against each other synthetic model. Based this comparison, tilt derivative appears most reliable method mapping and characterizing filtered dataset reveals linear anomalies interpreted altered relative abundance magnetic lineaments correlates broadly with slip tendency current stress field. Thus, may provide insights into reactivation deformation history zones, significantly influence hydraulic properties. However, additional geophysical surveys or exploration wells needed validate results.