{"id":16493,"date":"2015-10-19T05:30:50","date_gmt":"2015-10-19T05:30:50","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=16493"},"modified":"2015-10-18T15:40:28","modified_gmt":"2015-10-18T15:40:28","slug":"first-announcement-a-giant-rock-avalanche-on-the-flanks-of-mount-steele-in-the-yukon-last-week","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2015\/10\/19\/first-announcement-a-giant-rock-avalanche-on-the-flanks-of-mount-steele-in-the-yukon-last-week\/","title":{"rendered":"First announcement: a giant rock avalanche on the flanks of Mount Steele in the Yukon last week"},"content":{"rendered":"<h5>Mount Steele Rock Avalanche<\/h5>\n<p>On 12th October at 02:02:32 UT a giant rock avalanche occurred on the flanks of Mount Steele in the Yukon area of Northwest Canada.\u00a0 The landslide was detected by Colin Stark and Goram Ekstrom of Columbia University using the global seismic network, and I am posting this news with their kind permission.\u00a0 Since the landslide occurred the availability of cloud-free satellite imagery has allowed the location to be identified.<\/p>\n<p>The landslide is large &#8211; I will give the full details from the seismic inversion tomorrow &#8211; but Stark and Ekstrom estimate a mass of about 60 million tonnes, which yields a volume of about 24 million cubic metres.\u00a0 The crown of the landslide is at an elevation of about 3350 m, the total vertical distance is about 2200 m to the toe, with a runout over the Steele Glacier of about 3700 m.<\/p>\n<p>Colin Stark has provided this Landsat 8 image of the landslide, draped into a digital elevation model.\u00a0 As can be\u00a0 seen below the landslide detached from the flank of Steele SE, a sub-peak of Mount Steele:<\/p>\n<div id=\"attachment_16496\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/10\/15_10-Steel-1-e1445181192158.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16496\" class=\"wp-image-16496 size-full\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/10\/15_10-Steel-1-e1445181192158.jpg\" alt=\"Mount Steele\" width=\"640\" height=\"444\" \/><\/a><p id=\"caption-attachment-16496\" class=\"wp-caption-text\">Landsat 8 image of the Mount Steele rock avalanche, courtesy of Colin Stark and used with permission<\/p><\/div>\n<p>.<\/p>\n<p>This is an image of the same location on Mount Steele before the landslide, also from Landsat 8 via Colin Stark:<\/p>\n<div id=\"attachment_16499\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/10\/15_10-Steel-2-e1445181829971.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16499\" class=\"size-full wp-image-16499\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/10\/15_10-Steel-2-e1445181829971.jpg\" alt=\"Mount Steele rock avalanche\" width=\"640\" height=\"444\" \/><\/a><p id=\"caption-attachment-16499\" class=\"wp-caption-text\">Landsat 8 image of the location of the Mount Steele rock avalanche, courtesy of Colin Stark and used with permission<\/p><\/div>\n<p>.<\/p>\n<p>Note the location of the landslide as indicated through analysis of the Landslide Force History (LFH) seismic data.\u00a0 This was within 7 km of the actual location of the Mount Steele rock avalanche, which is impressively close.\u00a0 The seismic data suggests that this rock avalanche had a peak velocity of about 60 m \/ sec, which is about 220 km\/h.\u00a0 An interesting aspect of this landslide is the smooth morphology of the slope that failed compared to those around it, as seen in the above image.\u00a0 I am unsure as to whether this is significant.<\/p>\n<p>I will provide more detail about, and further images showing, this landslide tomorrow.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>I can reveal here for the first time that last week a giant rock avalanche was detected by Colin Stark and Goram Ekstrom on the flanks of Mount Steele in the Yukon, Canada<!-- AddThis Advanced Settings generic via filter on wp_trim_excerpt --><!-- AddThis Share Buttons generic via filter on wp_trim_excerpt --><\/p>\n","protected":false},"author":22,"featured_media":16496,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3],"tags":[4,469,959,306,25,588],"class_list":["post-16493","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-canada","tag-featured","tag-landslide-report","tag-rock-avalanche","tag-satellite","tag-seismic"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/16493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/comments?post=16493"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/16493\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/16496"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=16493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=16493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=16493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}