1. 1Department of Hydrology and Atmospheric Sciences, The University of Arizona, 1133 E. James E. Rogers Way, Tucson, Arizona 85721-0011, USA
2. 2Department of Geosciences, The University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA
3. 3Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
4. 4Department of Earth and Environmental Science, New Mexico Tech, 801 Leroy Place, Socorro, New Mexico 87801, USA
5. 5Department of Earth, Environmental and Resource Sciences, University of Texas at El Paso, 500 W. University, El Paso, Texas 79902, USA
6. 6Department of Mining and Geological Engineering, The University of Arizona, 1235 E. James E. Rogers Way, Tucson, Arizona 85721-0021, USA
7. 7Department of Civil, Geological and Environmental Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon S7N 5A9, Canada