{"id":28389,"date":"2018-07-24T05:58:17","date_gmt":"2018-07-24T05:58:17","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=28389"},"modified":"2018-07-24T05:58:17","modified_gmt":"2018-07-24T05:58:17","slug":"fagraskogarfjall-landslide-2","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2018\/07\/24\/fagraskogarfjall-landslide-2\/","title":{"rendered":"Fagraskogarfjall landslide – a high resolution satellite image via Planet Labs"},"content":{"rendered":"

Fagraskogarfjall landslide – a high resolution satellite image via Planet Labs<\/h4>\n

Planet Labs have succeeded in collecting a high resolution satellite image of the Fagraskogarfjall landslide<\/a>, the very large mass movement that occurred in Iceland on 7th July 2018.\u00a0 As a reminder, this is one of the largest known landslides in Iceland in recent history, triggered by the prolonged period of heavy rainfall from which the country has been suffering.\u00a0 The image was collected on 19th July 2018 using the SkySat satellite system, providing a very high resolution (and actually rather spectacular) image:-<\/p>\n

\"Fagraskogarfjall

Planet Labs<\/a> SkySat image of the Fagraskogarfjall landslide in Iceland. SkySat Image dated 19th July 2018, used with permission.<\/p><\/div>\n

.<\/p>\n

The high mobility of the Fagraskogarfjall landslide is evident from the image, with the deposit traveling a substantial distance across the flat terrain at the toe of the slope.\u00a0 I wonder in this case whether the likely saturated conditions in the valley floor may have increased mobility.\u00a0 The image also suggests that there may have been a second, smaller event with the debris falling onto the remains of the first failure.\u00a0 This would seem to be the most likely explanation for the lighter coloured debris that sits on the main landslide deposit:-<\/p>\n

\"Fagraskogarfjall

Detail of the Planet Labs<\/a> SkySat image of the Fagraskogarfjall landslide. SkySat Image dated 19th July 2018, used with permission.<\/p><\/div>\n

.<\/p>\n

This landslide also appears to have developed a very distinctive hummocky topography:-<\/p>\n

\"Fagraskogarfjall

Detail of the Planet Labs<\/a> SkySat image of the Fagraskogarfjall landslide, showing the hummocky terrain. SkySat Image dated 19th July 2018, used with permission.<\/p><\/div>\n

.<\/p>\n

This sort of hummocky terrain is common in landslides in volcanic terrain.\u00a0 These hummocks are formed by extensional faulting in the early stage of landslide movement.\u00a0 As the landslide ,movement develops, large blocks of mobile material develop and spread. In general, it has been noted that the largest hummocks lie at the rear of the landslide deposit, with smaller features at the front.\u00a0 There is some evidence of that in this case. If you are interested in this process, it has been modelled by Paguican et al.<\/em> (2014)<\/a>.\u00a0 The paper is online as a PDF<\/a>.<\/p>\n

References<\/h4>\n

Paguican, E.M.R., van Wyk de Vries, B. & Lagmay, A.M.F. 2014 Hummocks: how they form and how they evolve in rockslide-debris avalanches<\/a>. Landslides<\/em> (2014) 11: 67-80. https:\/\/doi.org\/10.1007\/s10346-012-0368-y<\/a><\/p>\n

Planet Team (2018). Planet Application Program Interface: In Space for Life on Earth. San Francisco, CA.\u00a0https:\/\/api.planet.com<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Planet Labs have captured a high resolution SkySat image of the Fagraskogarfjall landslide in Iceland. It shows the complex hummocky topography of the landslide deposit.<\/p>\n","protected":false},"author":22,"featured_media":28391,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[144,469,16534,109,1205,25,16529],"class_list":["post-28389","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-europe","tag-featured","tag-hummocks","tag-iceland","tag-planet-labs","tag-satellite","tag-skysat"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/28389","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=28389"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/28389\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/28391"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=28389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=28389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=28389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}