Nat. Hazards Earth Syst. Sci., 12, 1277–1294, 2012 www.nat-hazards-earth-syst-sci.net/12/1277/2012/ Natural Hazards doi:10.5194/nhess-12-1277-2012 and Earth © Author(s) 2012. CC Attribution 3.0 License. System Sciences The 6 August 2010 Mount Meager rock slide-debris flow, Coast Mountains, British Columbia: characteristics, dynamics, and implications for hazard and risk assessment R. H. Guthrie1, P. Friele2, K. Allstadt3, N. Roberts4, S. G. Evans5, K. B. Delaney5, D. Roche6, J. J. Clague4, and M. Jakob7 1MDH Engineered Solutions, SNC-Lavalin Group, Calgary, AB, Canada 2Cordilleran Geoscience, Squamish, BC, Canada 3Earth and Space Sciences, University of Washington, Seattle, WA, USA 4Centre for Natural Hazard Research, Simon Fraser University, Burnaby, BC, Canada 5Landslide Research Programme, University of Waterloo, Waterloo, ON, Canada 6Kerr Wood Leidal Associates Limited, Burnaby, BC, Canada 7BGC Engineering Inc., Vancouver, BC, Canada Correspondence to: R. H. Guthrie (
[email protected]) Received: 14 October 2011 – Revised: 7 February 2012 – Accepted: 3 March 2012 – Published: 4 May 2012 Abstract. A large rock avalanche occurred at 03:27:30 PDT, pre- and post-event topography we estimate the volume of 6 August 2010, in the Mount Meager Volcanic Complex the initial displaced mass from the flank of Mount Mea- southwest British Columbia. The landslide initiated as a rock ger to be 48.5 × 106 m3, the height of the path (H) to be slide in Pleistocene rhyodacitic volcanic rock with the col- 2183 m and the total length of the path (L) to be 12.7 km. lapse of the secondary peak of Mount Meager.