- Received 22 September 2016.
- Revision received 28 November 2016.
- Accepted 24 January 2017.
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- 1School of the Environment, Washington State University, PO Box 642812, Pullman, Washington 99164, USA
- 2Department of Geological Sciences and Institute for Geophysics, Jackson School of Geosciences, 2275 Speedway Stop C9000, University of Texas, Austin, Texas 78712, USA
- 3Instituto de Investigaciones Geológicas y del Medio Ambiente, Universidad Mayor de San Andrés, Calle 27 Cota Cota, La Paz, Bolivia