Numerous studies of glacier sliding have found that changing subglacial hydrology can explain variations in glacier motion over time-scales of days and longer. Direct measurements of sliding (Fischer & Clarke, 1997a; Hubbard, 2002) and seismicity data (e.g. Deichmann et al., 2000) have provided evidence of unsteady (stick-slip) glacier sliding at much shorter time-scales. These data suggest that friction may be important at the glacier bed, so that elastic strain accumulation and release also form a component of basal motion.

Data collected from the northern margin of Russell Glacier, West Greenland, during September 2002 have allowed investigation of basal motion variations at very short (subhour) time-scales. This paper presents a brief summary of the results and possible implications for basal motion at this and similar sites.

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