C. Caseldine, A. Russell, J. Hardard�ttir, O. Knudsen, J. Hardardóttir, UK) Caseldine, C. (Department of Geography, University of Exeter, UK) Russell, A. (School of Earth Sciences and Geography, Politics and Sociology, University of Newcastle-upon-Tyne, Iceland) Hardardottir, J. (Orkustofnun Hydrological Services, Reykjavik, Iceland) Knudsen, O. (Jardfraedistofan ehf., Reykjavik