Color display of Schlumberger soundings across a branch of the San Andreas Fault near Desert Hot Springs, California. The data were interpreted using Zohdy's algorithm which assumes one layer per data point. The
vertical lines of crosses indicate  the locations of the layer bottoms. The deep low resistivities are associated with ground-water. There are actually two faults in the cross section comprising a horst-like structure. The conductive  ground water forms updwells on the eastern side of the structure on  the left of the figure , flows over the  structure and forms somewhat of an underground waterfall and into the deeper basin to the right.

References:  Lukkarila                Drenth et al 2002