{"id":25412,"date":"2017-09-01T06:40:29","date_gmt":"2017-09-01T06:40:29","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=25412"},"modified":"2017-09-01T06:49:02","modified_gmt":"2017-09-01T06:49:02","slug":"zhangjiawan-rockslide","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2017\/09\/01\/zhangjiawan-rockslide\/","title":{"rendered":"Stunning, unbelievable, high resolution footage of the Zhangjiawan rockslide"},"content":{"rendered":"<h4>Stunning, unbelievable, high resolution footage of the Zhangjiawan rockslide<\/h4>\n<p>Reader Fabien has kindly pointed out to me that Liveleak has new footage of the <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2017\/08\/29\/zhangjiawan-landslide-1\/\">Zhangjiawan rockslide in Guizhou Province in China<\/a>, which killed 26 people and left a further nine missing and presumed killed.\u00a0 <a href=\"https:\/\/www.liveleak.com\/view?i=42b_1504124957\">This is the recording<\/a>, which sadly has no further metadata. Frustratingly WordPress no longer allows me to embed Liveleak videos, so I have embedded the <a href=\"https:\/\/www.youtube.com\/watch?v=BQJQ0qst3l4\">Youtube copy<\/a> of the video:-<\/p>\n<iframe loading=\"lazy\" width=\"480\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/BQJQ0qst3l4?feature=oembed\" frameborder=\"0\" allowfullscreen><\/iframe>\n<p>.<\/p>\n<p>This is undoubtedly one of the best ever recordings of the development of a major rockslide, capturing the precursory rockfall activity as well as the final failure event.\u00a0 The impression is clearly of a progressively disintegrating rockmass, rapidly fragmenting as movement develops.\u00a0 This may well be associated with the development of rotation in the mass.\u00a0 I have captured three elements of the initiation of the final collapse below:-<\/p>\n<div id=\"attachment_25414\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-25414\" class=\"size-full wp-image-25414\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2017\/09\/17_09-Ghuizhou-4-e1504245019168.jpg\" alt=\"Zhangjiawan rockslide\" width=\"640\" height=\"360\" \/><p id=\"caption-attachment-25414\" class=\"wp-caption-text\">The initiation of the Zhangjiawan rockslide. Stilll from a video posted pseudo-anonymously to Liveleak<\/p><\/div>\n<p>.<\/p>\n<p>This sequence shows that at the point of the development of rapid motion the rockslide was undergoing both toppling (i.e. the mass was rotating such that the upper section of the rockmass was moving more rapidly than the lower portion, and the whole mass is in effect tilting forwards) and basal sliding into the valley.\u00a0 This is a large-scale version of the motion that can be imagined from this <a href=\"http:\/\/www.empr.gov.bc.ca\/Mining\/Geoscience\/SurficialGeology\/Landslides\/Pages\/Whatarethedifferenttypesoflandslides.aspx\">simple block diagram<\/a>, although obviously it was far more complex when on the scale of the\u00a0 Zhangjiawan rockslide:-<\/p>\n<div id=\"attachment_25419\" style=\"width: 330px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-25419\" class=\"size-full wp-image-25419\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2017\/09\/17_09-toppling-and-sliding-1.gif\" alt=\"Zhangjiawan rockslide\" width=\"320\" height=\"240\" \/><p id=\"caption-attachment-25419\" class=\"wp-caption-text\">Simple block diagram to illustrate toppling and slide, via the <a href=\"http:\/\/www.empr.gov.bc.ca\/Mining\/Geoscience\/SurficialGeology\/Landslides\/Pages\/Whatarethedifferenttypesoflandslides.aspx\">BC Government<\/a><\/p><\/div>\n<p>.<\/p>\n<p>Meanwhile, <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2017\/08\/29\/zhangjiawan-landslide-1\/#comment-214517\">in a comment on my previous post<\/a> my good friend Tim Davies asked about the runout of the landslide, and in particular spectulated that the runout length might have been quite short.\u00a0 This <a href=\"http:\/\/gbtimes.com\/china\/death-toll-rises-17-southwest-china-landslide\">ChinaNews image<\/a> shows the full landslide track:-<\/p>\n<div id=\"attachment_25422\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-25422\" class=\"size-full wp-image-25422\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2017\/09\/17_09-Ghuizhou-5-e1504246255299.jpg\" alt=\"Zhangjiawan rockslide\" width=\"640\" height=\"480\" \/><p id=\"caption-attachment-25422\" class=\"wp-caption-text\"><a href=\"http:\/\/gbtimes.com\/china\/death-toll-rises-17-southwest-china-landslide\">ChinaNews image<\/a> of the Zhangjiawan rockslide<\/p><\/div>\n<p>.<\/p>\n<p>This suggests that whilst not being hyper-mobile, the track was probably not very short.\u00a0 There are some signs that the portion on the right side of the image has transitioned into a flow I think.\u00a0 <a href=\"http:\/\/news.xinhuanet.com\/english\/2017-08\/31\/c_136571495.htm\">Xinhua reports<\/a> that the landslide volume was about 600,000 m\u00b3, with a fall height (I assume of the initial failure) of about 200 m.<\/p>\n<p>I have not yet been able to locate this landslide reliably.\u00a0 Has anyone else had any luck?<\/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>Extraordinary high resolution video footage has been posted on Liveleak showing the initiation of the Zhangjiawan rockslide in China on Monday<!-- 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":25414,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[16,881,469,963,136,8167],"class_list":["post-25412","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-china","tag-east-asia","tag-featured","tag-landslide-video","tag-rockslide","tag-toplle"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/25412","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=25412"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/25412\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/25414"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=25412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=25412"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=25412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}