1. COMET, School of Earth Sciences; University of Bristol; Bristol UK
2. U.S. Geological Survey, California Volcano Observatory; Menlo Park CA USA
3. Instituto Geofísico; Escuela Politécnica Nacional; Quito Ecuador
4. LMV; Université Clermont Auvergne; Clermont-Ferrand France
5. COMET, Department of Meteorology; University of Reading; Reading UK
6. COMET, School of Earth and Environment; University of Leeds; Leeds UK