Deformation of Bore Hole in Malaspina Glacier, Alaska

• Main Author: Sharp, Robert P.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Geological Society of America 1953
• Subjects: Arctic; Rigsby; Arctic Institute of North America; glacier; glaciers; The Arctic Institute; Alaska
• Online Access: https://doi.org/10.1130/0016-7606(1953)64[97:DOBHIM]2.0.CO;2

Demorest's (1942, p. 31-38; 1943, p. 365-373) exposition of extrusion flow in glaciers has not enjoyed universal acceptance. Skepticism has been especially strong in England where physicists have produced well-considered arguments and calculations showing that extrusion flow is a mechanical improbability (Orowan, 1949, p. 233-236; Nye, 1951, p. 565; 1952a; 1952b). Their analyses necessarily involve gross simplifications and are based in part upon assumptions concerning the physical properties and behavior of ice under long-continued confining pressure and stress so the validity of their conclusions needs independent confirmation. © 1953 The Geological Society of America, Inc. This work constitutes part of Project Snow Cornice, an endeavor of the Arctic Institute of North America directed by Walter A. Wood. The Office of Naval Research supported the glaciological research under contract N6onr 244-16, and the Parsons Survey Company of South Gate, California, kindly loaned a small-diameter inclinometer without charge for the surveys of 1951 and 1952. Bellingham Canning Company, the U. S. Coast Guard, and the Civil Aeronautic Association provided valuable logistical support. The following men participated in the work at the test site: C. R. Allen, D. R. Baker, L. H. Nobles, G. P. Rigsby, and G. I. Smith. The aid of these organizations and individuals is gratefully acknowledged. California Institute of Technology, Pasadena, California Division of Geological Sciences, Contribution no. 610.