[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, Cambs, England
[2] Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AJ, Fife, Scotland
[3] Univ Durham, Dept Earth Sci, Durham DH1 3LE, Durham, England
[4] Tribhuvan Univ, Dept Civil Engn, Kathmandu 44613, Bagmati, Nepal
[5] Univ Rennes, Geosci Rennes, CNRS, UMR 6118, F-35042 Rennes, Brittany, France
[6] GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, Sect Geomorphol 4 6, D-14473 Brandenburg, Germany