{"id":39442,"date":"2021-10-29T07:28:59","date_gmt":"2021-10-29T07:28:59","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=39442"},"modified":"2021-10-29T07:36:14","modified_gmt":"2021-10-29T07:36:14","slug":"volcanic-boulder","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/10\/29\/volcanic-boulder\/","title":{"rendered":"The mobility of a rolling volcanic boulder"},"content":{"rendered":"<h4>The mobility of a rolling volcanic boulder<\/h4>\n<p>On this blog I have frequently written about the <a href=\"https:\/\/blogs.agu.org\/landslideblog\/?s=boulder&amp;submit.x=0&amp;submit.y=0&amp;mswhere=blog\">mobility of boulders<\/a> once they <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2016\/03\/12\/nasty-dancing-rocks\/\">start rotating on their way down slope<\/a>.\u00a0 A very beautiful example of this was <a href=\"https:\/\/twitter.com\/harrigeiger\/status\/1453784459686318082\">posted to Twitter yesterday<\/a> by <a href=\"https:\/\/twitter.com\/harrigeiger\">Harri Geiger<\/a>.\u00a0 The video was shot on the flanks of the still erupting Cumbre Vieja volcano on La Palma in Spain:<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">Spallation lava bomb coming down from <a href=\"https:\/\/twitter.com\/hashtag\/LaPalmaVolcano?src=hash&amp;ref_src=twsrc%5Etfw\">#LaPalmaVolcano<\/a> on 27 Oct 2021.<a href=\"https:\/\/twitter.com\/hashtag\/CumbreVieja?src=hash&amp;ref_src=twsrc%5Etfw\">#CumbreVieja<\/a> <a href=\"https:\/\/t.co\/mvKFKn6rme\">pic.twitter.com\/mvKFKn6rme<\/a><\/p>\n<p>&mdash; Harri Geiger (@harrigeiger) <a href=\"https:\/\/twitter.com\/harrigeiger\/status\/1453784459686318082?ref_src=twsrc%5Etfw\">October 28, 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 video captures a spallation lava bomb.\u00a0 As the video shows, this was a boulder that was roughly spherical, and it was moving on a surface essentially devoid of obstructions and that had, until late in the sequence, a steady slope.\u00a0 The resultant video is a remarkable record of the extreme mobility in these situations.<\/p>\n<p>If the film Raiders of the Lost Ark is ever remade then this video of a high mobility, extremely hot boulder might be food for thought.<\/p>\n<div id=\"attachment_39445\" style=\"width: 750px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-39445\" class=\"size-full wp-image-39445\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/10\/21_10-Harrison-Ford-1.jpg\" alt=\"The boulder chasing Harrison Ford in the Film Raiders of the Lost Ark. \" width=\"740\" height=\"370\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/10\/21_10-Harrison-Ford-1.jpg 740w, https:\/\/blogs.agu.org\/landslideblog\/files\/2021\/10\/21_10-Harrison-Ford-1-300x150.jpg 300w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><p id=\"caption-attachment-39445\" class=\"wp-caption-text\">The boulder chasing Harrison Ford in the Film Raiders of the Lost Ark. <a href=\"https:\/\/screenrant.com\/indiana-jones-raiders-lost-arc-bts-secrets-surprises-easter-eggs\/\">Still from Screenrant<\/a>.<\/p><\/div>\n<p>.<\/p>\n<p>Meanwhile, the eruption continues with a great deal of energy.\u00a0 There is no reported evidence of the much-hyped catastrophic flank collapse, and thus of the resultant mega-tsunami, as far as I can see.\u00a0 On 25 October <a href=\"https:\/\/twitter.com\/SotisValkan\">Sotiris Valkaniotis<\/a> <a href=\"https:\/\/twitter.com\/SotisValkan\/status\/1452710068873572353\">tweeted his latest InSAR analysis of deformation on La Palma<\/a>:<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">Cumulative displacement &amp; interferograms from Copernicus <a href=\"https:\/\/twitter.com\/hashtag\/Sentinel1?src=hash&amp;ref_src=twsrc%5Etfw\">#Sentinel1<\/a> imagery, for the past month of volcanic activity in <a href=\"https:\/\/twitter.com\/hashtag\/LaPalmaVolcano?src=hash&amp;ref_src=twsrc%5Etfw\">#LaPalmaVolcano<\/a> <a href=\"https:\/\/twitter.com\/hashtag\/Canarias?src=hash&amp;ref_src=twsrc%5Etfw\">#Canarias<\/a>. Descending interferogram has quite decent quality despite of 36d interval. Processed at <a href=\"https:\/\/twitter.com\/Ak_Satellite?ref_src=twsrc%5Etfw\">@Ak_Satellite<\/a> DAAC HyP3 using GAMMA. 1\/2 <a href=\"https:\/\/t.co\/xbHkoLXRgj\">pic.twitter.com\/xbHkoLXRgj<\/a><\/p>\n<p>&mdash; Sotiris Valkaniotis (@SotisValkan) <a href=\"https:\/\/twitter.com\/SotisValkan\/status\/1452710068873572353?ref_src=twsrc%5Etfw\">October 25, 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 I&#8217;d expect, this shows inevitable inflation and deflation around the vents, but no indication of large scale instability in the flank.\u00a0 La Palma is being monitored closely by multiple groups using multiple sets of tools, so any changes would be rapidly detected.<\/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>A remarkable video from the Cumbre Vieja eruption on La Palma shows the high level of mobility of an almost spherical boulder moving on a slope with few obstructions. Indiana Jones could face a greater hazard is Raiders of the Lost Ark is ever remade.<!-- 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":39452,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[116,29100,144,469,6243,963,249,30665],"class_list":["post-39442","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-video","tag-boulder","tag-boulder-roll","tag-europe","tag-featured","tag-la-palma","tag-landslide-video","tag-spain","tag-twitter"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/39442","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=39442"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/39442\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/39452"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=39442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=39442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=39442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}