{"id":15022,"date":"2015-05-05T07:30:52","date_gmt":"2015-05-05T07:30:52","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=15022"},"modified":"2015-05-05T07:30:52","modified_gmt":"2015-05-05T07:30:52","slug":"the-langtang-ice-and-rock-avalanche-in-the-gorkha-earthquake","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2015\/05\/05\/the-langtang-ice-and-rock-avalanche-in-the-gorkha-earthquake\/","title":{"rendered":"The Langtang ice and rock avalanche in the Gorkha Earthquake"},"content":{"rendered":"<h5>The Langtang ice and rock avalanche<\/h5>\n<p>Over the weekend the picture is slowly becoming clearer in terms of landslides associated with the <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2015\/05\/02\/gorkha-earthquake-1\/\">Gorkha Earthquake in Nepal<\/a>.\u00a0 It is now apparent that the level of landsliding in the Hill Districts at least is rather lower than we might have feared, although it is still far from insignificant.\u00a0 Understanding the situation in the higher mountains remains very challenging due to the amount of cloud cover that is still preventing satellite images from being available.\u00a0 We have to hope that a window opens up before the monsoon.<\/p>\n<p>So far the stand our landslide event appears to be the ice and rock avalanche at Langtang.\u00a0 This appears to have caused substantial loss of life.\u00a0 Not for the faint-hearted, this<a href=\"https:\/\/www.youtube.com\/watch?v=9BEDRlFImD8\"> BBC report from the scene<\/a> leaves little to the imagination in terms of the likely losses.<\/p>\n<p>.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/9BEDRlFImD8\" width=\"640\" height=\"360\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>.<\/p>\n<p><a href=\"http:\/\/www.spaceref.com\/news\/viewsr.html?pid=47137\">NASA have managed to collect some imagery of the site<\/a>.\u00a0 This is a post-event Landsat 8 image that clearly shows the avalanche:<\/p>\n<div id=\"attachment_15023\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-1-e1430807148885.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15023\" class=\"size-full wp-image-15023\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-1-e1430807148885.jpg\" alt=\"Langtang\" width=\"640\" height=\"427\" \/><\/a><p id=\"caption-attachment-15023\" class=\"wp-caption-text\"><a href=\"http:\/\/www.spaceref.com\/news\/viewsr.html?pid=47137\">NASA Landsat 8<\/a><\/p><\/div>\n<p>.<\/p>\n<p>This is the Google Earth image of the village of Langtang before the ice and rock avalanche:<\/p>\n<div id=\"attachment_15024\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-2-e1430807441522.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15024\" class=\"size-full wp-image-15024\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-2-e1430807441522.jpg\" alt=\"Langtang\" width=\"640\" height=\"416\" \/><\/a><p id=\"caption-attachment-15024\" class=\"wp-caption-text\">Google Earth<\/p><\/div>\n<p>.<\/p>\n<p>The <a href=\"http:\/\/www.digitalglobeblog.com\/2015\/04\/26\/digitalglobe-opens-access-to-satellite-data-to-support-disaster-response-efforts-in-nepal\/\">Digital Globe satellite imagery<\/a> of the site captures the avalanche track and deposit pretty well:<\/p>\n<div id=\"attachment_15025\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-4-e1430808756334.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15025\" class=\"size-full wp-image-15025\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-4-e1430808756334.jpg\" alt=\"Langtang\" width=\"640\" height=\"533\" \/><\/a><p id=\"caption-attachment-15025\" class=\"wp-caption-text\"><a href=\"http:\/\/www.digitalglobeblog.com\/2015\/04\/26\/digitalglobe-opens-access-to-satellite-data-to-support-disaster-response-efforts-in-nepal\/\">Digital Globe<\/a><\/p><\/div>\n<p>.<\/p>\n<p>This is a slightly odd event because of the lack of a clear large deposit.\u00a0 My initial (and very provisonal) interpretation would be that a chunk of ice and rock broke off from the slope above the village &#8211; a comparison of the Google Earth image from January with the Digital Globe image suggests this strongly:<\/p>\n<p>Before:-<\/p>\n<div id=\"attachment_15026\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-45jpg-e1430809185218.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15026\" class=\"size-full wp-image-15026\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-45jpg-e1430809185218.jpg\" alt=\"Langtang\" width=\"640\" height=\"416\" \/><\/a><p id=\"caption-attachment-15026\" class=\"wp-caption-text\">Google Earth<\/p><\/div>\n<p>After:<\/p>\n<div id=\"attachment_15027\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-5-e1430809297792.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15027\" class=\"size-full wp-image-15027\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/05\/15_05-Langtang-5-e1430809297792.jpg\" alt=\"Langtang\" width=\"640\" height=\"650\" \/><\/a><p id=\"caption-attachment-15027\" class=\"wp-caption-text\"><a href=\"http:\/\/www.digitalglobeblog.com\/2015\/04\/26\/digitalglobe-opens-access-to-satellite-data-to-support-disaster-response-efforts-in-nepal\/\">Digital Globe<\/a><\/p><\/div>\n<p>.<\/p>\n<p>I suspect that this mass then went through freefall \/ rapid sliding into the valley below (removing rock from the surface en route &#8211; the planed off surface is clearly apparent in the image above). Google Earth suggests that the fall was about 700 or 800 m vertical distance &#8211; and that the mass then fragmented on impact to create a massive blast of air, ice and rock.\u00a0 This is similar to the <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2014\/01\/25\/seti-river-iss\/\">Seti River rock avalanche<\/a> that I featured three years ago, although on a smaller scale.\u00a0 This mechanism would account for the huge damage that occurred in Langtang.<\/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>Satellite imagery and on site reports suggest that the Langtang ice and rock avalanche occurred when a block freefell about 700 m before fragmenting to generate a blast of ice, rock and air.<!-- 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":15023,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[537,3],"tags":[505,469,66,306,72],"class_list":["post-15022","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earthquake-induced-landslide","category-landslide-report","tag-avalanche","tag-featured","tag-nepal","tag-rock-avalanche","tag-south-asia"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/15022","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=15022"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/15022\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/15023"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=15022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=15022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=15022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}