GROUND-BASED GEOPHYSICAL SURVEYS OF GEOTHERMAL SYSTEM AT MOUNT BAKER, WA, USA
Detailed geologic mapping of the area has been limited due to dense vegetation and steep topography. LiDAR imagery revealed several NE-trending linear features, some of which are coincident with Baker Hot Springs. These features were investigated through dense ground-based gravity and magnetic surveys conducted between July and September 2016. Among other features, the studies revealed a strong magnetic and gravity gradient beneath Baker Hot Springs and extending ~1.7 km to the SSW. This anomaly is coincident with a linear feature observed in LiDAR and near a mapped fault. Near the hot springs, the pronounced linear anomaly intersects a NE-trending, less well-defined linear anomaly, suggesting a possible permeable pathway associated with the intersection of these linear features. We present several 2-D forward models of gravity and magnetic data as well as a 3-D inversion of magnetic susceptibility to interpret the structural controls of the Mount Baker hydrothermal system.