{"id":38046,"date":"2021-07-08T08:36:09","date_gmt":"2021-07-08T08:36:09","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=38046"},"modified":"2021-07-08T08:36:09","modified_gmt":"2021-07-08T08:36:09","slug":"sullorsuaq-greenland-a-large-landslide-on-15-june-2021","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/07\/08\/sullorsuaq-greenland-a-large-landslide-on-15-june-2021\/","title":{"rendered":"Sullorsuaq, Greenland: a large landslide on 15 June 2021"},"content":{"rendered":"<h4>Sullorsuaq, Greenland: a large landslide on 15 June 2021<\/h4>\n<p>On 15 June 2021 a large landslide occurred on the margin of the Sullorsuaq Strait in a remote are of western <a href=\"https:\/\/blogs.agu.org\/landslideblog\/?s=greenland&amp;submit.x=0&amp;submit.y=0&amp;mswhere=blog\">Greenland<\/a>. <a href=\"https:\/\/twitter.com\/K_Svennevig\/status\/1405502391143833605\">This landslide was reported in a tweet<\/a> by Kristian Svennevig (<a href=\"https:\/\/twitter.com\/K_Svennevig\">@K_Svennevig<\/a>), a geologist who works for the Geological Survey of Denmark and Greenland:-<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">Fresh (and rather large) <a href=\"https:\/\/twitter.com\/hashtag\/landslide?src=hash&amp;ref_src=twsrc%5Etfw\">#landslide<\/a> in Greenland from two days ago. Source area is at 900 m, 2 km inland. No reports of tsunami. This is just in between the (larger) 1952 Niiortuut landslide and the (giant) 2000 Paatuut landslide and the setting looks similar. <a href=\"https:\/\/t.co\/KpNBwZnL73\">pic.twitter.com\/KpNBwZnL73<\/a><\/p>\n<p>&mdash; Kristian Svennevig (@K_Svennevig) <a href=\"https:\/\/twitter.com\/K_Svennevig\/status\/1405502391143833605?ref_src=twsrc%5Etfw\">June 17, 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>As the image in the tweet shows, this was a large failure.\u00a0 Obtaining decent images of such a remote location is difficult, although the site is likely to be visited by researchers during the summer field season.\u00a0 Satellite imagery is also a challenge in an area with high levels of cloud.\u00a0 But on 18 June <a href=\"https:\/\/twitter.com\/K_Svennevig\/status\/1405994405455093765\">Kristian tweeted an image from the ESA Sentinel 2 satellite than captures the landslide<\/a>:-<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">Fresh <a href=\"https:\/\/twitter.com\/hashtag\/sentinel2?src=hash&amp;ref_src=twsrc%5Etfw\">#sentinel2<\/a> of the June 15th <a href=\"https:\/\/twitter.com\/hashtag\/landslide?src=hash&amp;ref_src=twsrc%5Etfw\">#landslide<\/a> in Greenland. Wow &#8211; just wow. Look at those lobes building out into Vaigat. See you in 1\u00bd month!<br \/>Image credit <a href=\"https:\/\/twitter.com\/hashtag\/ESA?src=hash&amp;ref_src=twsrc%5Etfw\">#ESA<\/a> and <a href=\"https:\/\/twitter.com\/sentinel_hub?ref_src=twsrc%5Etfw\">@sentinel_hub<\/a> <a href=\"https:\/\/t.co\/y1GN7ehqjc\">pic.twitter.com\/y1GN7ehqjc<\/a><\/p>\n<p>&mdash; Kristian Svennevig (@K_Svennevig) <a href=\"https:\/\/twitter.com\/K_Svennevig\/status\/1405994405455093765?ref_src=twsrc%5Etfw\">June 18, 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>Yesterday, <a href=\"https:\/\/cmscheip.users.earthengine.app\/view\/hazmapper#lon=-52.99385039413451;lat=70.32071638389235;zoom=14;dataset=0;prewindow=2;postwindow=2;maxCloudCover=100;slopeThreshold=0;eventDate=20210615;\">the Hazmapper team provided their processed imagery of the site using their remarkable tool<\/a> (this can take a little while to load &#8211; it is worth the wait).\u00a0 This started to provide a far better understanding of this landslide:-<\/p>\n<div id=\"attachment_38049\" style=\"width: 672px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-38049\" class=\"wp-image-38049 size-full\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Waigat-1.jpg\" alt=\"Hazmapper image of the 15 June 2021 landslide into the Sullorsuaq in Greenland.\" width=\"662\" height=\"738\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Waigat-1.jpg 662w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Waigat-1-269x300.jpg 269w\" sizes=\"auto, (max-width: 662px) 100vw, 662px\" \/><p id=\"caption-attachment-38049\" class=\"wp-caption-text\">Hazmapper image of the 15 June 2021 landslide into the Sullorsuaq in Greenland.<\/p><\/div>\n<p>.<\/p>\n<p>Unfortunately, the timing of the <a href=\"https:\/\/www.planet.com\/\">Planet Labs<\/a> imagery has meant that their satellites have not yet captured the whole of the landslide.\u00a0 However, they did capture an image on 21 June 2021 that provides more detail of the lower portion of the failure:-<\/p>\n<div id=\"attachment_38053\" style=\"width: 683px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-38053\" class=\"wp-image-38053 \" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Vaigat-2.jpg\" alt=\"PlanetScope satellite image of the 15 June 2021 landslide into the Sullorsuaq in Greenland.\" width=\"673\" height=\"623\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Vaigat-2.jpg 821w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Vaigat-2-300x278.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/07\/21_07-Vaigat-2-768x711.jpg 768w\" sizes=\"auto, (max-width: 673px) 100vw, 673px\" \/><p id=\"caption-attachment-38053\" class=\"wp-caption-text\">PlanetScope satellite image of the 15 June 2021 landslide into the Sullorsuaq in Greenland. Image copyright <a href=\"https:\/\/www.planet.com\/\">Planet Labs<\/a>, used with permission.<\/p><\/div>\n<p>.<\/p>\n<p>The images suggest that the landslide into the Sullorsuaq was a c.2.5 km long failure with flow type behaviour.\u00a0 The <a href=\"https:\/\/www.planet.com\/\">Planet Labs image<\/a> shows multiple lobes of material that have built impressive deposits into the water.<\/p>\n<p>This failure has occurred on a steep rock slope &#8211; the Google Earth data suggests that the slope extends from sea level to about 820 m over a distance of about 2.4 km.\u00a0 <a href=\"https:\/\/www.google.com\/maps?ll=70.32142,-52.99206&amp;z=14&amp;t=h\">The upper reaches have a complex topography that might suggest deep-seated gravitational deformations are occurring<\/a>, but others are better placed to comment on that issue.<\/p>\n<p>.<\/p>\n<h4>Reference<\/h4>\n<p>Planet Team (2021). Planet Application Program Interface: In Space for Life on Earth. San Francisco, CA. <a href=\"https:\/\/www.planet.com\/\">https:\/\/www.planet.com\/<\/a><\/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>On 15 June 2021 a large landslide occurred on the margin of the Sullorsuaq Strait in a remote are of western Greenland.<!-- 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":38053,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[469,5655,959,1205,521],"class_list":["post-38046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-featured","tag-greenland","tag-landslide-report","tag-planet-labs","tag-satellite-image"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/38046","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=38046"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/38046\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/38053"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=38046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=38046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=38046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}