{"id":37452,"date":"2021-04-20T07:29:16","date_gmt":"2021-04-20T07:29:16","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=37452"},"modified":"2021-04-20T09:26:57","modified_gmt":"2021-04-20T09:26:57","slug":"nefyn-bay","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/04\/20\/nefyn-bay\/","title":{"rendered":"The 19 April 2021 coastal landslide at Nefyn Bay in North Wales"},"content":{"rendered":"<h4>The 19 April 2021 coastal landslide at Nefyn Bay in North Wales<\/h4>\n<p>On 19 April 2021 a really interesting coastal landslide occurred at Nefyn Bay in North <a href=\"https:\/\/blogs.agu.org\/landslideblog\/?s=wales&amp;submit.x=0&amp;submit.y=0&amp;mswhere=blog\">Wales<\/a>.\u00a0 <a href=\"https:\/\/www.bbc.co.uk\/news\/uk-wales-56799238?at_custom3=%40BBCWalesNews&amp;at_custom4=A2347246-A10A-11EB-ADD9-D67D0EDC252D&amp;at_custom2=twitter&amp;at_custom1=%5Bpost+type%5D&amp;at_medium=custom7&amp;at_campaign=64\">The BBC has some good imagery of the aftermath<\/a>:-<\/p>\n<div id=\"attachment_37455\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-37455\" class=\" wp-image-37455\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/04\/21_04-Nefyn-1.jpg\" alt=\"The 19 April 2021 coastal landslide at Nefyn Bay in North Wales.\" width=\"799\" height=\"420\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/04\/21_04-Nefyn-1.jpg 1993w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/04\/21_04-Nefyn-1-300x158.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/04\/21_04-Nefyn-1-1024x538.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/04\/21_04-Nefyn-1-768x403.jpg 768w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/04\/21_04-Nefyn-1-1536x807.jpg 1536w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><p id=\"caption-attachment-37455\" class=\"wp-caption-text\">The 19 April 2021 coastal landslide at Nefyn Bay in North Wales. <a href=\"https:\/\/www.bbc.co.uk\/news\/uk-wales-56799238?at_custom3=%40BBCWalesNews&amp;at_custom4=A2347246-A10A-11EB-ADD9-D67D0EDC252D&amp;at_custom2=twitter&amp;at_custom1=%5Bpost+type%5D&amp;at_medium=custom7&amp;at_campaign=64\">Image by Christian Pilling via BBC News<\/a>.<\/p><\/div>\n<p>.<\/p>\n<p>This landslide is interesting for its timing &#8211; the UK is having a spell of unusually dry weather for April &#8211; and for its runout, which is quite long.<\/p>\n<p>This landslide has received some attention in the UK, but strangely the most interesting element has not really received much publicity.\u00a0 <a href=\"http:\/\/yahoo.com\/entertainment\/woman-narrowly-escapes-landslide-northern-010526879.html\">This is that the landslide was captured on video by a woman, Amanda Stubbs, who was standing at the toe<\/a>.\u00a0 It is brilliant.\u00a0 <a href=\"https:\/\/www.youtube.com\/watch?v=jQG152DZDFE\">You should be able to see it below<\/a>:-<\/p>\n<iframe loading=\"lazy\" title=\"Woman Narrowly Escapes Landslide in Northern Wales\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/jQG152DZDFE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<p>.<\/p>\n<p>The landslide starts as a small retrogressive slump on the margin of what becomes the main slide.\u00a0 This destabilises the main mass, which fails through a strongly rotational mechanism.\u00a0 After failure the mass runs across the beach as a high mobility earthflow.<\/p>\n<p>There is some excellent drone imagery of the aftermath:-<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"cy\" dir=\"ltr\">Tirlithriad Nefyn 19.04.2022 <a href=\"https:\/\/t.co\/oI7y0lA2Xb\">pic.twitter.com\/oI7y0lA2Xb<\/a><\/p>\n<p>&mdash; Cai Erith Williams (@caierith) <a href=\"https:\/\/twitter.com\/caierith\/status\/1384140583543791628?ref_src=twsrc%5Etfw\">April 19, 2021<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>.<\/p>\n<p>The imagery shows the multiple scars of previous landslides on this section of coast, so this failure comes as no surprise.\u00a0 <a href=\"https:\/\/www.bgs.ac.uk\/case-studies\/nefyn-bay-north-wales-landslide-case-study\/\">The British Geological Survey (BGS) have a page dedicated to coastal landslides at Nefyn Bay, based on work undertaken after a fatal landslide on this section of coast in 2001<\/a>.\u00a0 There is also a paper online (<a href=\"http:\/\/nora.nerc.ac.uk\/id\/eprint\/1512\/\">Jenkins <em>et al.<\/em> 2007<\/a> &#8211; one of the authors is <a href=\"https:\/\/researchportal.port.ac.uk\/portal\/en\/persons\/andy-gibson(c154d5e6-f936-4ea0-aeb4-5024d247ebcb).html\">my former PhD student Andy Gibson<\/a>) that describes the nature of the landslides at the site and the evolution of the hazard.\u00a0 The landslides occur in glacial deposits that are eroded by the sea, exacerbated by sand layers overlying a low permeability clay.<\/p>\n<p>.<\/p>\n<h4>Reference<\/h4>\n<p><span class=\"person nerc_int_name\"><span class=\"person_name\">Jenkins, G.O.<\/span><\/span>;\u00a0<span class=\"person nerc_int_name\"><span class=\"person_name\">Gibson, A.D.<\/span><\/span>;\u00a0<span class=\"person nerc_int_name\"><span class=\"person_name\">Humpage, A.J.<\/span><\/span>. 2007. <a href=\"http:\/\/nora.nerc.ac.uk\/id\/eprint\/1512\/\">Climate change and evolution of landslide hazard at Nefyn Bay, North Wales<\/a>. In: <span class=\"person\"><span class=\"person_name\">McInnes, Robin<\/span><\/span>, (ed.)\u00a0<em>Landslides and climate change: challenges and solutions. Proceedings of the International Conference on Landslides and Climate Change.<\/em>\u00a0Taylor and Francis, 113-119.<\/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>The 19 April 2021 coastal landslide at Nefyn Bay in North Wales, which was caught on a brilliant video by a woman on the beach.  <!-- 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":37455,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[183,469,30631,959,963,133,575],"class_list":["post-37452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-coast","tag-featured","tag-glacial-materials","tag-landslide-report","tag-landslide-video","tag-uk","tag-wales"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/37452","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=37452"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/37452\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/37455"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=37452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=37452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=37452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}