1. Department of Geography and Institute of Hazard Risk and Resilience; Durham University; South Road Durham DH1 3LE UK
2. School of Geography, Politics and Sociology; Newcastle University; Newcastle upon Tyne UK
3. Laboratoire Magmas et Volcans; Université Blaise Pascal; Clermont-Ferrand France
4. Institute of Geology, Adam Mickiewicz University in Poznań; Poznań Poland