{"id":23139,"date":"2017-04-09T08:17:40","date_gmt":"2017-04-09T08:17:40","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=23139"},"modified":"2017-04-09T08:18:19","modified_gmt":"2017-04-09T08:18:19","slug":"papamoa-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2017\/04\/09\/papamoa-1\/","title":{"rendered":"Papamoa: a brilliant video illustrating the mobility of landslides"},"content":{"rendered":"<div id=\"fb-root\"><\/div>\n<p><script>(function(d, s, id) {\n  var js, fjs = d.getElementsByTagName(s)[0];\n  if (d.getElementById(id)) return;\n  js = d.createElement(s); js.id = id;\n  js.src = \"\/\/connect.facebook.net\/en_GB\/sdk.js#xfbml=1&version=v2.8\";\n  fjs.parentNode.insertBefore(js, fjs);\n}(document, 'script', 'facebook-jssdk'));<\/script><\/p>\n<h5>Papamoa: a brilliant video illustrating the mobility of landslides<\/h5>\n<p>One of the hardest things to explain about landslides is the ways in which changes in the structure of soils can cause dramatic reductions of strength, and thus increases in mobility. A brilliant video has been <a href=\"https:\/\/www.facebook.com\/emma.kapua\/videos\/10212085454072148\/\">posted to Facebook by Emma Kapua<\/a> that illustrates this point as never before, I think.\u00a0 This landslide occurred in the Papamoa Hills of New Zealand, one of many landslides triggered by the remnants of Tropical Cyclone Debbie as it passed over the country last week:<\/p>\n<p>&nbsp;<\/p>\n<div class=\"fb-video\" data-href=\"https:\/\/www.facebook.com\/emma.kapua\/videos\/vb.1248699961\/10212085454072148\/?type=2&amp;theater\" data-width=\"640\" data-show-text=\"false\">\n<blockquote class=\"fb-xfbml-parse-ignore\" cite=\"https:\/\/www.facebook.com\/emma.kapua\/videos\/10212085454072148\/\"><p>&nbsp;<\/p>\n<p>The force of nature! Papamoa Hills Regional Park 6th April 2017 after heavy rain from ex. TC Debbie.<\/p>\n<p>Posted by <a href=\"#\">Emma Kapua<\/a> on Thursday, 6 April 2017<\/p><\/blockquote>\n<\/div>\n<p>&nbsp;<\/p>\n<p>.<\/p>\n<p>You will see that this starts as a classic, small rotational failure.\u00a0 It is clearly formed from intact soil at this point:-<\/p>\n<div id=\"attachment_23160\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-23160\" class=\"size-full wp-image-23160\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2017\/04\/17_04-Papamoa-1-e1491724631542.jpg\" alt=\"Papamoa \" width=\"640\" height=\"331\" \/><p id=\"caption-attachment-23160\" class=\"wp-caption-text\">Papamoa: the early phase of the landslide caught on <a href=\"https:\/\/www.facebook.com\/emma.kapua\/videos\/10212085454072148\/\">video by Emma Kapua and posted to Facebook<\/a>.<\/p><\/div>\n<p>.<\/p>\n<p>As the landslide goes around the circular shear surface it fragments rapidly, and changes phase:-<\/p>\n<div id=\"attachment_23174\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-23174\" class=\"size-full wp-image-23174\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2017\/04\/17_04-Papamoa-2-e1491724769550.jpg\" alt=\"Papamoa\" width=\"640\" height=\"336\" \/><p id=\"caption-attachment-23174\" class=\"wp-caption-text\">The fluidisation of the Papamoa landslide, as caught on <a href=\"https:\/\/www.facebook.com\/emma.kapua\/videos\/10212085454072148\/\">video by Emma Kapua and uploaded to Facebook<\/a><\/p><\/div>\n<p>Thereafter the landslide behaves as a fluidised mass, and thus accelerates rapidly down the steep part of the slope:-<\/p>\n<div id=\"attachment_23180\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-23180\" class=\"size-full wp-image-23180\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2017\/04\/17_04-Papamoa-3-e1491724908299.jpg\" alt=\"Papamoa\" width=\"640\" height=\"339\" \/><p id=\"caption-attachment-23180\" class=\"wp-caption-text\">The final phase of the Papamoa landslide, as captured by <a href=\"https:\/\/www.facebook.com\/emma.kapua\/videos\/10212085454072148\/\">Emma Kapua and posted to Facebook<\/a><\/p><\/div>\n<p>.<\/p>\n<p>Understanding the processes that allow some soils to respond in this way has been a key aspect of landslide research, and of course it is essential to appreciate these mechanisms if the likely impact of future landslides is to be determined.\u00a0 It is the failure to understand that landslides can show this behaviour that can lead to an under-appreciation of the hazard that some landslides can pose. Clearly once a slide is moving in this way then the destructive potential is very high.<\/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>A brilliant video has been uploaded to Facebook from Papamoa in New Zealand which illustrates the process of fluidisation of a rotational landslide<!-- 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":23174,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[29],"tags":[469,963,7],"class_list":["post-23139","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-video","tag-featured","tag-landslide-video","tag-new-zealand"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/23139","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=23139"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/23139\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/23174"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=23139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=23139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=23139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}