An assessment of surge-induced crevassing and the formation of crevasse squeeze ridges

Brice R. Rea, David J.A. Evans

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Evidence for extensive crevassing is preserved on the deglaciated forelands of many surging glaciers as crevasse squeeze ridges (CSRs). At some point these crevasses make direct connection with the bed in order to become sediment filled, and full-depth connections have been inferred from turbid water up-wellings in crevasses and the formation of concertina eskers. The dynamics of seven surging glaciers are assessed, using a linear elastic fracture mechanics approach, to determine the likely directions of fracture and controlling parameters for Mode I crevasses. Extensional surface strain rates are insufficient to promote top-down full-depth penetration. For small crevasse spacing (
Original languageEnglish
Article numberF04005
Number of pages17
JournalJournal of Geophysical Research: Earth Surface
Volume116
Issue numberF4
Early online date19 Oct 2011
DOIs
Publication statusPublished - Dec 2011

Keywords

  • basal crevassing
  • basal water pressure
  • crevasse squeeze ridges
  • full-depth crevassing
  • linear elastic fracture mechanics
  • surging

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