{"id":30917,"date":"2019-05-08T06:49:08","date_gmt":"2019-05-08T06:49:08","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=30917"},"modified":"2019-05-08T06:49:08","modified_gmt":"2019-05-08T06:49:08","slug":"hargraves-crater-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2019\/05\/08\/hargraves-crater-1\/","title":{"rendered":"Hargraves Crater: is this a landslide on Mars? Your views please"},"content":{"rendered":"<h4>Hargraves Crater: is this a landslide on Mars? Your views please<\/h4>\n<p>Yesterday the <a href=\"https:\/\/uahirise.org\/\">NASA HiRISE team<\/a> posted an image that they described as a &#8220;<span class=\"observation-id-title\"><a href=\"https:\/\/www.uahirise.org\/anaglyph\/singula.php?ID=ESP_050965_2025\">Distinctive Lobe of Northern Hargraves Crater Ejecta Blanket<\/a>&#8220;. This is the salient part of the image:-<\/span><\/p>\n<div id=\"attachment_30919\" style=\"width: 630px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-30919\" class=\"size-full wp-image-30919\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-2.jpg\" alt=\"Hargraves Crater.\" width=\"620\" height=\"1374\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-2.jpg 620w, https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-2-135x300.jpg 135w, https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-2-462x1024.jpg 462w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><p id=\"caption-attachment-30919\" class=\"wp-caption-text\">&#8220;<em>Distinctive Lobe of Northern Hargraves Crater Ejecta Blanket<\/em>&#8220;. <a href=\"https:\/\/www.uahirise.org\/anaglyph\/singula.php?ID=ESP_050965_2025\">Image via NASA\/JPL\/University of Arizona<\/a>.<\/p><\/div>\n<p>.<\/p>\n<p>On Twitter, <a href=\"https:\/\/twitter.com\/acwiebusch\">Andrew Wiebusch<\/a> <a href=\"https:\/\/twitter.com\/acwiebusch\/status\/1125873760681242625\">raised the possibility that this is not an ejecta blanket<\/a>, but is instead a sign of slope instability:-<\/p>\n<div id=\"attachment_30922\" style=\"width: 545px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-30922\" class=\"size-full wp-image-30922\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-3.jpg\" alt=\"Hargraves Crater\" width=\"535\" height=\"752\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-3.jpg 535w, https:\/\/blogs.agu.org\/landslideblog\/files\/2019\/05\/19_05-Mars-3-213x300.jpg 213w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \/><p id=\"caption-attachment-30922\" class=\"wp-caption-text\">Tweets from Andrew Wiebusch regarding the possibility that a feature at Hargraves Crater on Mars is a sign of slope instability<\/p><\/div>\n<p>.<\/p>\n<p>I am no expert on landslide features on Mars (or on other planetary bodies), but I can understand the interpretation that Andrew is making.\u00a0 There appears to be a large arcuate scar, and ridges occur within this that look like tension features and scarps.\u00a0 The main body of the feature appears to be disrupted compared with the surrounding topography, much as landslides on Earth develop distinctive disrupted hummocky terrain.\u00a0 The main landslide body appears to lie within, and flow from, a bowl-shaped feature .<\/p>\n<p>My strong sense is that such a feature on Earth would be interpreted as a sign of past slope instability, assuming that the regional slope coincided with the observed landslide topography (I have no sense of the regional slope in this case).\u00a0 However, I am more hesitant about making such an interpretation for a feature on Mars. So your views are welcome via the comments.\u00a0 Do you agree that this might be a landslide?\u00a0 If so, why do you make this interpretation?\u00a0 If not, what are the features that differentiate this from a slope instability?<\/p>\n<p>The comments are moderated (to try to avoid the deluge of spam that the blog attracts), so please be patient as it might take a few hours for your post to appear.\u00a0 Unfortunately <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2016\/10\/26\/leaving-uea\/\">my day job<\/a> gets in the way of the important things in life ;-).<\/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>Yesterday @HiRISE posted an image of the &#8220;Distinctive Lobe of Northern Hargraves Crater Ejecta Blanket&#8221;. On Twitter @acwiebusch asks if this is a 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":30919,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[569],"tags":[23617,469,217,898,15447],"class_list":["post-30917","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-planetary-landslide","tag-crater","tag-featured","tag-mars","tag-planet","tag-planetary-landslide"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/30917","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=30917"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/30917\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/30919"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=30917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=30917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=30917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}