{"id":35862,"date":"2020-12-18T07:59:49","date_gmt":"2020-12-18T07:59:49","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=35862"},"modified":"2020-12-18T08:01:01","modified_gmt":"2020-12-18T08:01:01","slug":"arequipa-1-2","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2020\/12\/18\/arequipa-1-2\/","title":{"rendered":"Arequipa, Peru: landslides from a M=5.6 earthquake on 16 December 2020"},"content":{"rendered":"<h4>Arequipa, Peru: landslides from a M=5.6 earthquake on 16 December 2020<\/h4>\n<p>The city of Arequipa in Peru was struck by a <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/us7000crmx\/executive\">M=5.6 earthquake at 17:48 UT on 16 December 2020<\/a>.\u00a0 This was a comparatively deep earthquake (<a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/us7000crmx\/executive\">87 km according to the USGS<\/a>) in an area with a history of significant seismicity.\u00a0 It is not expected that an earthquake of this magnitude at such a depth would cause large amounts of structural damage (or indeed extensive landslides), and indeed there are no reports that I can find of loss of life.<\/p>\n<p>This earthquake is however interesting because it appears to have generated significant landslide activity in the mountains around the city.\u00a0 These were caught on <a href=\"https:\/\/www.youtube.com\/watch?v=RdjwAVkE0uk\">a video that has been posted to Youtube<\/a>, which is quite dramatic:-<\/p>\n<iframe loading=\"lazy\" title=\"5.5 magnitude earthquake causes landslides in Arequipa, Peru\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/RdjwAVkE0uk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<p>.<\/p>\n<p>The video of course is showing the clouds of dust generated by landslides (most probably rockfalls) in this extremely dry environment.\u00a0 We have seen this effect previously where earthquakes have occurred in very arid environments, most notably in the 2010 <a title=\"Permanent Link to Landslides from the 2010 Mw=7.2 earthquake in the Sierra Cucapah, Mexico\" href=\"https:\/\/blogs.agu.org\/landslideblog\/2014\/12\/17\/sierra-cucapah\/\" rel=\"bookmark\">M=7.2 earthquake in the Sierra Cucapah, Mexico,<\/a> which was also caught on video.\u00a0 In Mexico we studied the landslides via remote sensing and wrote up the results (<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0169555X14005662\">Barlow<em> et al.<\/em> 2014<\/a>).\u00a0 Whilst the videos of the event were very dramatic, and rockfalls were widespread, the volume of material moved by the failures was quite small.<\/p>\n<p>It is difficult to know whether this will be the case here:-<\/p>\n<div id=\"attachment_35867\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-35867\" class=\" wp-image-35867\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1.jpg\" alt=\"Landslides from the M=5.6 earthquake in Peru\" width=\"800\" height=\"352\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1.jpg 2239w, https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1-300x132.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1-1024x450.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1-768x338.jpg 768w, https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1-1536x676.jpg 1536w, https:\/\/blogs.agu.org\/landslideblog\/files\/2020\/12\/20_12-Arequipa-1-2048x901.jpg 2048w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-35867\" class=\"wp-caption-text\">Landslides from the 16 December 2020 M=5.6 earthquake in Peru. Still from a video posted to Youtube.<\/p><\/div>\n<p>.<\/p>\n<p>There are some images online of rockfalls triggered by the earthquake, especially on roads, but I have not been able to track down any images of larger failures.\u00a0 These may of course be located in remote areas, if they have occurred.<\/p>\n<p>.<\/p>\n<h4>Reference<\/h4>\n<p>Barlow, J., Barisin, I., Rosser, N., Petley, D.,\u00a0 Densmore, A. and Wright, T. 2015. Seismically-induced mass movements and volumetric fluxes resulting from the 2010 Mw = 7.2 earthquake in the Sierra Cucapah, Mexico, <em>Geomorphology<\/em>, <strong>230<\/strong>, 138-145. <a href=\"http:\/\/dx.doi.org\/10.1016\/j.geomorph.2014.11.012\">http:\/\/dx.doi.org\/10.1016\/j.geomorph.2014.11.012<\/a>.<\/p>\n<p>&nbsp;<\/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>Arequipa, Peru: landslides triggered by a M=5.6 earthquake on 16 December 2020 have been caught on a dramatic video <!-- 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":35867,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[537],"tags":[23,469,959,158,588,122,35],"class_list":["post-35862","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earthquake-induced-landslide","tag-earthquake","tag-featured","tag-landslide-report","tag-peru","tag-seismic","tag-south-america","tag-video"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/35862","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=35862"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/35862\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/35867"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=35862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=35862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=35862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}