Alexander K Kendrick¹, Rosemary J Knight¹, Carole D Johnson², Gaisheng Liu³, Steven Knobbe³, Randall Hunt⁴ and James J Butler Jr³, (1)Stanford University, Geophysics, Stanford, CA, United States, (2)USGS, Storrs, CT, United States, (3)University of Kansas, Kansas Geological Survey, Lawrence, KS, United States, (4)U.S. Geological Survey, Upper Midwest Water Science Center, Middleton, WI, United States