{"id":7662,"date":"2014-01-04T09:24:40","date_gmt":"2014-01-04T09:24:40","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=7662"},"modified":"2014-01-04T09:27:07","modified_gmt":"2014-01-04T09:27:07","slug":"hastings-rockfall","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2014\/01\/04\/hastings-rockfall\/","title":{"rendered":"Hastings rockfall: dramatic new landslide videos from southern England"},"content":{"rendered":"<h5>Context of the Hastings Rockfall<\/h5>\n<p>The context of the Hastings Rockfall is that over the last few weeks the UK has been suffering the effects of a series of exceptional low pressure systems that have swept in from the Atlantic, bringing heavy rainfall and very strong winds.\u00a0 Unfortunately, <a href=\"http:\/\/www.bbc.co.uk\/news\/uk-25601796\">the onslaught continues today<\/a>.\u00a0 The consequence has been high levels of damage (and <a href=\"http:\/\/www.bbc.co.uk\/news\/uk-politics-25594526\">a political fuss about funding for flood defences<\/a>), and (unsurprisingly) many landslides.<\/p>\n<h5>The Hastings Rockfall event<\/h5>\n<p>Perhaps the most spectacular event captured on video to date occurred at Rock-A-Nore in Hastings in East Sussex.\u00a0 Most of the coverage (e.g. <a href=\"http:\/\/metro.co.uk\/2014\/01\/03\/breathtaking-moment-a-chunk-of-hastings-cliff-face-breaks-away-into-sea-4248862\/\">the Metro<\/a> and <a href=\"http:\/\/www.bbc.co.uk\/news\/uk-england-sussex-25594640\">the BBC<\/a>) has featured the <a href=\"http:\/\/www.youtube.com\/watch?v=rAmkjc7kcu0\">Youtube video<\/a> below, but in fact this is not the best one:<\/p>\n<p>http:\/\/www.youtube.com\/watch?v=rAmkjc7kcu0<\/p>\n<p>If you look carefully at the above video you will see that before the collapse there is a fresh scar on the cliff face.\u00a0 This is because the above event is the second collapse in the sequence.\u00a0 The first <a href=\"http:\/\/www.youtube.com\/watch?v=hJVW1oXZz2w\">was also captured on video and is on Youtube<\/a>:<\/p>\n<p><iframe loading=\"lazy\" title=\"Cliff fall Huge Land slide\/ Rock slide into the sea in Hastings Old town East Sussex. Part 1\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/hJVW1oXZz2w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p><a href=\"http:\/\/www.youtube.com\/watch?v=jMdw6eyupIQ\">The second collapse was also captured<\/a> by the same person, although this video is less good:<\/p>\n<p><iframe loading=\"lazy\" title=\"Huge Land slide\/Rock slide\/ Cliff falls into the sea in Hastings East Sussex.Part 2\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/jMdw6eyupIQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Three aspects are interesting here.\u00a0 First, without the videos we would probably have considered these collapses to have been a single collapse.\u00a0 One of the things that the run of videos is doing is the highlight the sequential nature of failures.\u00a0 Second, a simple before and after analysis would have led to the interpretation that these collapses were simple rock topples, but in fact the mechanism of failure is very complex, in the case of the second set of collapses perhaps driven by compressional failure of the foot of the failing block.\u00a0 And third, the reason that the videos were being captured is that there was precursory rockfall activity.<\/p>\n<h5>Background information on the location of the Hastings Rockfall<\/h5>\n<p>For those interested in the location of the Hastings Rockfall, <a href=\"http:\/\/www.discoveringfossils.co.uk\/hastings_fossils.htm\">the Discovering Fossils website<\/a> has a good description of the geology of the cliff, which includes this photograph taken before the collapse:<\/p>\n<div id=\"attachment_7663\" style=\"width: 460px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2014\/01\/14_01-Rock-A-Nore.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-7663\" class=\"size-full wp-image-7663\" alt=\"Hastings rockfall\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2014\/01\/14_01-Rock-A-Nore.jpg\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2014\/01\/14_01-Rock-A-Nore.jpg 450w, https:\/\/blogs.agu.org\/landslideblog\/files\/2014\/01\/14_01-Rock-A-Nore-300x225.jpg 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><p id=\"caption-attachment-7663\" class=\"wp-caption-text\">Discovering Fossils: http:\/\/www.discoveringfossils.co.uk\/hastings_fossils.htm<\/p><\/div>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>New videos have appeared on Youtube over the last 24 hours of a large, dramatic rock cliff collapse at Rock-A-Nore near Hastings in East Sussex, England<!-- 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":7663,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[732,56,133,35],"class_list":["post-7662","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-video","tag-coastal-cliff","tag-rockfall","tag-uk","tag-video"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/7662","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=7662"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/7662\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/7663"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=7662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=7662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=7662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}