TY  - JOUR
PY  - 2008//
TI  - Large-scale moraine deformation at the Athabasca Glacier, Jasper National Park, Alberta, Canada
JO  - Landslides
A1  - Hugenholtz, Chris
A1  - Moorman, Brian
A1  - Barlow, John
A1  - Wainstein, Pablo
SP  - 251
EP  - 260
VL  - 5
IS  - 3
N2  - In this paper the development of a large-scale gravitational deformation involving the eastern lateral moraine of the Athabasca Glacier in Jasper National Park, Alberta, Canada, is described. Interpretation and analysis of sequential aerial photographs indicates that a 540-m-wide segment of the eastern lateral moraine began to deform in the early 1950s; however, significant movement only began in the late 1960s. Since then, the moraine has undergone progressive gravitational deformation leading to a network of fractures, bulging, and the development of a large gap in the moraine crest. Geographic information system analysis of topographic changes between 1967 and 2006 indicates that the displaced volume of the moraine is approximately 9.0 × 10 5 m 3 . In the last 39 years, the moraine crest has displaced 55 m (1.4 m yr −1 ) down towards the glacier. The development of slope instability is linked to a combination of debuttressing from recent glacier recession, deformation of the moraine, as well as the movement of a large, mobile, debris-mantled slope impinging the upslope margin of the lateral moraine. This case study illustrates the importance of glacial conditioning and local geomorphological factors in creating conditions for large-scale moraine instability in recently deglacierized alpine basins.<p /> 
LA  - 
SN  - 1612-510X
UR  - http://dx.doi.org/10.1007/s10346-008-0116-5
ID  - ref1
ER  -