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Landslides

, Volume 5, Issue 4, pp 445–455 | Cite as

The July 2007 rock and ice avalanches at Mount Steele, St. Elias Mountains, Yukon, Canada

  • Panya S. LipovskyEmail author
  • Stephen G. Evans
  • John J. Clague
  • Chris Hopkinson
  • Réjean Couture
  • Peter Bobrowsky
  • Göran Ekström
  • Michael N. Demuth
  • Keith B. Delaney
  • Nicholas J. Roberts
  • Garry Clarke
  • Andrew Schaeffer
Recent Landslides

Abstract

A large rock and ice avalanche occurred on the north face of Mount Steele, southwest Yukon Territory, Canada, on July 24, 2007. In the days and weeks preceding the landslide, several smaller avalanches initiated from the same slope. The ice and rock debris traveled a maximum horizontal distance 5.76 km with a maximum vertical descent of 2,160 m, leaving a deposit 3.66 km2 in area on Steele Glacier. The seismic magnitude estimated from long-period surface waves (M s) is 5.2. Modeling of the waveforms suggests an estimated duration of approximately 100 s and an average velocity of between 35 and 65 m/s. This landslide is one of 18 large rock avalanches known to have occurred since 1899 on slopes adjacent to glaciers in western Canada. We describe the setting, reconstruct the event chronology and present a preliminary characterization of the Mount Steele ice and rock avalanches based on field reconnaissance, analysis of seismic records and an airborne LiDAR survey. We also present the results of a successful dynamic simulation for the July 24 event.

Keywords

Rock avalanche Ice avalanche Mount Steele St. Elias Mountains Yukon Territory 

Notes

Acknowledgements

We gratefully acknowledge contributions to this study made by Steve Israel (Yukon Geological Survey); Peter von Gaza (Pixel Mapper Geoscience); Doug Makkonen (Trans North Helicopters); Lance Goodwin, Andy Williams and Donjek Upton (Icefield Ranges Expeditions); Dr. John Barlow and the Canadian Consortium for LiDAR Environmental Applications Research (C-CLEAR) field crew; Lloyd Freese (Kluane National Park); Christian Zdanowicz (Geological Survey of Canada); Dr. Natalia Ruppert (Alaska Earthquake Information Center, University of Alaska Fairbanks); and Dr. Gerald Holdsworth (Arctic Institute of North America, University of Calgary). Stephen A. Wolfe provided a Geological Survey of Canada internal review. We also acknowledge the helpful reviews of Dr. Patrick Wassmer and an anonymous reviewer. We acknowledge Natural Resources Canada Earth Sciences Sector contribution number 20070457.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Panya S. Lipovsky
    • 1
    Email author
  • Stephen G. Evans
    • 2
  • John J. Clague
    • 3
  • Chris Hopkinson
    • 4
  • Réjean Couture
    • 5
  • Peter Bobrowsky
    • 5
  • Göran Ekström
    • 6
  • Michael N. Demuth
    • 7
  • Keith B. Delaney
    • 2
  • Nicholas J. Roberts
    • 2
  • Garry Clarke
    • 8
  • Andrew Schaeffer
    • 8
  1. 1.Yukon Geological SurveyGovernment of YukonWhitehorseCanada
  2. 2.Landslide Research Programme, Department of Earth and Environmental SciencesUniversity of WaterlooWaterlooCanada
  3. 3.Centre for Natural Hazard Research, Department of Earth SciencesSimon Fraser UniversityBurnabyCanada
  4. 4.Applied Geomatics Research Group, Centre of Geographic SciencesNova Scotia Community CollegeLawrencetownCanada
  5. 5.Geological Survey of Canada (Landslides and Geotechnics)Natural Resources CanadaOttawaCanada
  6. 6.Lamont-Doherty Earth ObservatoryColumbia UniversityPalisadesUSA
  7. 7.Geological Survey of Canada (Glaciology)Natural Resources CanadaOttawaCanada
  8. 8.Department of Earth and Ocean SciencesUniversity of British ColumbiaVancouverCanada

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