Regional comparison of old-deep slab avalanches

3 Tracz, Dave Bellaire, Sascha Jamieson, Bruce 2011 Regional comparison of old-deep slab avalanches 5th Canadian Conference on Geotechnique and Natural Hazards Kelowna, BC 15/05/2011 deep slab avalanches, avalanche forecasting, snowpack statigraphy 31 Tracz, D. Jamieson, B. 2010 Characteristics of old-deep-slab avalanches Osterhuber, R. and Ferrari, M. International Snow Science Workshop Squaw Valley, California 148-154 17/10/2010 deep slab avalanche, avalanche forecasting, snow cover stability, snowpack properties, snowpack instability tests <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="ProgId" content="Word.Document" /> <meta name="Generator" content="Microsoft Word 12" /> <meta name="Originator" content="Microsoft Word 12" /> <link href="file:///C:%5CUsers%5CBruce%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_filelist.xml" rel="File-List" /> <link href="file:///C:%5CUsers%5CBruce%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_themedata.thmx" rel="themeData" /> <link href="file:///C:%5CUsers%5CBruce%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_colorschememapping.xml" rel="colorSchemeMapping" /> <style id="dynCom" type="text/css"></style> <script language="JavaScript"> </script><style>  </style> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="ProgId" content="Word.Document" /> <meta name="Generator" content="Microsoft Word 12" /> <meta name="Originator" content="Microsoft Word 12" /> <link href="file:///C:%5CUsers%5CBruce%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_filelist.xml" rel="File-List" /> <link href="file:///C:%5CUsers%5CBruce%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_themedata.thmx" rel="themeData" /> <link href="file:///C:%5CUsers%5CBruce%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_colorschememapping.xml" rel="colorSchemeMapping" /> <style>  </style><span style="font-size: 12pt; line-height: 150%; font-family: 'Arial','sans-serif'" lang="EN-CA">Deep and old slab avalanches (ODS) are often hard-to-forecast. The size and destructive potential of ODS avalanches can be disturbing. As a starting point for a study of hard-to-forecast avalanches we define ODS avalanches based on a large dataset spanning the three main mountain ranges of western Canada: Coast, Columbia and Rocky Mountains. The definition is based on extreme slab depth and extreme age of the snowpack weakness that failed causing the avalanche. Our data did not reveal a difference in slope angle or aspect between the deep-old-slab avalanches (ODS) and â��Otherâ�� avalanches. However, compared to Other avalanches, ODS avalanches were typically of greater size, involved less human triggering, released more often on crusts and weak layers of facets and tended to occur more often in early winter.</span><span style="font-size: 12pt; line-height: 150%; font-family: 'Arial','sans-serif'" lang="EN-CA"></span> <div>  <hr class="msocomoff" align="left" width="33%" size="1" />  <div>  <div id="_com_1" class="msocomtxt" language="JavaScript" onmouseover="msoCommentShow('_anchor_1','_com_1')" onmouseout="msoCommentHide('_com_1')"> <span><a title="_msocom_1" name="_msocom_1"></a></span> </div> </div> <div> <div id="_com_2" class="msocomtxt" language="JavaScript" onmouseover="msoCommentShow('_anchor_2','_com_2')" onmouseout="msoCommentHide('_com_2')"> <p class="MsoCommentText"> <span lang="EN-CA"><br /> <o:p></o:p></span> </p>  </div>  </div> </div>