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Published 1979 | Published
Journal Article Open

The Ice-Rock Interface and Basal Sliding Process as Revealed by Direct Observation in Bore Holes and Tunnels


The glacier bed, where basal sliding occurs, was reached by cable-tool drilling and sand-pump bailing in seven bore holes in Blue Glacier, Olympic National Park, Washington. Basal sliding velocities measured by bore-hole photography and confirmed by inclinometry are unexpectedly low, ranging from 0.3 to 3.0 cm/day and averaging 1.0 cm/day. This is much less than about half the surface velocity of 15 cm/day, which was the sliding-rate expected from earlier deformation measurements in bore holes made by thermal drilling alone.

Additional Information

© 1979 International Glaciological Society.

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Published - icerock_interface_and_basal_sliding_process_as_revealed_by_direct_observation_in_bore_holes_and_tunnels.pdf



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August 19, 2023
October 19, 2023