From the plot of GPS-derived horizontal speeds on the Bench Glacier in Figure 8.18a, estimate 1) the background speed of the glacier that is presumably attributable to internal deformation of the ice, and 2) scale the maximum sliding speeds during the two speed-up events at the GPS 3 site.

Figure 8.18a

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Horizontal displacement (m) Discharge (m³/s) Bed separation (m) 2 1 0.25 0.2 0.15 0.1 0.05 068642O 10 a 140 b Sliding speed Event 1 C 8-d mnohu muh Mushum 0.1 (m/d) 0 wwwwwwwwwwwww/-/||^^^^~~4 Manstader Discharge MAN ANN MA распроти только 2m/9d Event 2 150 160 enflur? 4 WAAMAAN 3 170 Day of year 2002 gps1 gps2 gps3 gps4 gps5 www 180 Suspended sediment concentration M 190 3 1 0.3m/58d wwwwwwwww. 3 3 N 2 0 (g/L) Concentration