USGS Groundwater Information: Branch of Geophysics
![]() Figure 1. (a) Radar zero-offset slowness and (b) radar zero-offset amplitude profiles for the INJ-3 to MW-7 plane, Anoka County Riverfront Park, Fridley, Minnesota |
![]() Figure 2. Field study slowness-difference tomograms for the MW-1 to INJ-2 and MW-7 to INJ-3 planes using the weighted damped least-squares (WDLS) inversion method, Anoka County Riverfront Park, Fridley, Minnesota (after Lane et al., 2004). |
![]() Figure 3. Interpreted conceptual model of the June 2003 cross-sectional distribution of groundwater with inferred, highly elevated total dissolved solids (TDS) (medium gray), moderately elevated TDS (light gray), and the region where pure-phase vegetable oil emulsion is found in the subsurface (dark gray), Anoka County Riverfront Park, Fridley, Minnesota. |