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Figure captions

VIEWS: 12 PAGES: 1

									Figure captions

1. Location map of the Russell Glacier. The inset displays the location of the study
   site at the glacier’s terminus.

2. Sketch diagram of the study site, illustrating the location of all of the markers (with
   the exception of marker RC, which was situated approximately 20 metres down-
   glacier, i.e. to the right) including the vertical marker array within the stratified
   facies, basal ice (1-6), the left control marker (LC), and the markers surrounding
   the debris-band (U, M and L).

3. Total motion of all the markers during the experiment: (A) markers 1 to 6 and
   marker LC; (B) markers U, M, L, RC and CC. A gap in a marker’s trace relates to a
   period when the marker ablated out of the ice and no measurement was recorded.

4. The (A) horizontal and (B) vertical components of the total velocity vector. The
   markers are described in numerical order (1=highest, 6=lowest; y-axis), whilst the
   time elapsed since the start of the experiment is displayed on the x-axis, and the
   velocity component on the z-axis. Only the markers from the BIL vertical array are
   illustrated.

5. Variation in (a) horizontal velocity, (b) vertical velocity and (c) total velocity, with
   height in the BIL. The height is measured using the bottom marker (6) as the
   datum. Regression lines are displayed along with their associated coefficient of
   determination (R2 value).

6. Spatial patterns of movement in the horizontal (X-Y) plane. Motion in all cases
   occurs from right to left. A gap in the trace of a marker indicates a period when the
   marker ablated out of the ice and no measurement was recorded. Markers within
   the BIL vertical array are displayed in (A), those surrounding the debris-band in
   (B), and LC and RC in (C).

7. Spatial patterns of movement in the vertical, flow-parallel (XY-Z) plane. Motion in
   all cases occurs from right to left. A gap in the trace of a marker indicates a period
   when the marker ablated out of the ice and no measurement was recorded. Markers
   within the BIL vertical array are displayed in (A), those surrounding the debris-
   band in (B), and LC and RC in (C).

8. Schematic diagram comparing profiles of motion between a basal ice layer
   characterised by: a) pervasive deformation, b) one displaying a heterogeneous
   composition.

								
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