1. Department of Industrial Engineering, University of La Laguna (ULL), Campus Ancheta, 38200 La Laguna, Spain
2. Department of Geology, University of Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5001-801 Vila Real, Portugal
3. CGeo–Geosciences Center, University of Coimbra, Rua Silvino Lima, Polo II, 3030-790 Coimbra, Portugal