Chairs: Esben Auken, Aarhus University, Department of Geoscience, Aarhus C, Denmark, John W Lane Jr, USGS, Hydrogeophysics Branch, Storrs, CT, United States, Xavier Comas, Florida Atlantic University, Geosciences, Boca Raton, FL, United States and Burke J Minsley, USGS Geology, Geophysics, and Geochemistry Science Center, Denver, CO, United States