Constraining fault-zone hydrogeology through integrated hydrological and geoelectrical analysis

摘要: The hydrogeologic influence of the Elkhorn fault in South Park, Colorado, USA, is examined through hydrologic data supplemented by electrical resistivity tomography and self-potential measurements. Water-level indicate that groundwater flow impeded on spatial scale tens meters, but lack outcrop prevents interpretation why creates this heterogeneity. By supplementing geologic with geoelectrical measurements, further possible. Resistivity profiles are consistent increased fracturing within 70 m fault. Further zone includes possibility a vertical component fractured relatively high permeability damage one or more low cores resulting conduit-barrier behavior at meter to tens-of-meters scale. Calculated hydraulic heads from reveal additional complexity structure, including steeper gradient immediately west interpreted trace than suggested well alone.