1. Institut für Umweltphysik; University of Heidelberg; Heidelberg Germany
2. Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences; University of East Anglia; Norwich United Kingdom
3. Institute Nazionale di Geofisica e Vulcanologia; Palermo Italy
4. Department of Environmental Sciences, Second University of Napoli; Caserta Italy
5. Prevention and Analysis of Natural Hazards; UNOPS; Kinshasa Democratic Republic of Congo
6. Dipartimento Scienze della Terra e del Mare; University of Palermo; Palermo Italy
7. Observatoire Volcanologique de Goma; Goma Democratic Republic of Congo
8. Department of Earth and Space Sciences; Chalmers University of Technology; Göteborg Sweden