{"id":37156,"date":"2021-03-26T11:17:17","date_gmt":"2021-03-26T11:17:17","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=37156"},"modified":"2021-03-26T11:17:17","modified_gmt":"2021-03-26T11:17:17","slug":"raoul-island-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/03\/26\/raoul-island-1\/","title":{"rendered":"Raoul Island: landslides from the 5 March 2021 M8.1 earthquake"},"content":{"rendered":"

Raoul Island: landslides from the 5 March 2021 M8.1 earthquake<\/h4>\n

Onn 5 March 2021 a M=8.1 earthquake occurred off the coast of New Zealand<\/a>.\u00a0 Located close to the fault is Raoul Island<\/a>, the largest and most northerly of the Kermadec Islands<\/a>. The island, which has a surface area of about 29.4 km2<\/sup>, has been volcanically active in a geologically recent timeframe.\u00a0 It is hilly, with terrain extending to 516 m.\u00a0 As such it was likely that it would suffer landslides triggered by the earthquake.<\/p>\n

Under the banner of Geonet<\/a>, GNS Science researchers have released some initial information about landslides triggered by the earthquake<\/a>, based upon field observations and the analysis of satellite imagery.\u00a0 In total they have mapped over 300 landslides triggered by the earthquake or its immediate aftershocks – quite a high number for a comparatively small area.\u00a0 They have released a map of the landslides, which cluster on steep terrain and along the coast.\u00a0 The image below was collected by Planet Labs<\/a>, showing of a part of Raoul Island on 9 March 2021:<\/p>\n

\"Landslides

Coseismic landslides on Raoul Island. Image copyright Planet Labs<\/a>, used with permission.<\/p><\/div>\n

.<\/p>\n

The Geonet report includes some photographs of the landslides seen in the Planet Labs<\/a> image:-<\/p>\n

\"Landslides

Landslides on the edge of Blue Lake on Raoul Island. Image from GNS Science \/ Geonet<\/a>.<\/p><\/div>\n

.<\/p>\n

The research team have made the following observations about the landslides:<\/p>\n

The most spectacular landslides were around Blue Lake, and along the rugged coastline. There was a significant slip at Bells Beach, where about 400 m of coastal cliffs collapsed, leaving a plume of sediment in the ocean. Most of the landslides were relatively small (100-200 m\u00b3) rock and soil avalanches and falls, but there were some larger ones up to about 20,000 m\u00b3. The largest landslides were on the north-east coast near Hutchison Bluff, and around the crater of Blue Lake, most landslides comprised rock and soil avalanches and falls.<\/em><\/p>\n

Reference<\/h4>\n

Planet Team (2021). Planet Application Program Interface: In Space for Life on Earth. San Francisco, CA. https:\/\/www.planet.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Raoul Island: Under the auspices of @geonet, researchers from @gnsscience have mapped >300 landslides triggered by the 5 March 2021 M=8.1 earthquake <\/p>\n","protected":false},"author":22,"featured_media":37161,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[537],"tags":[23,469,959,7,1205],"class_list":["post-37156","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earthquake-induced-landslide","tag-earthquake","tag-featured","tag-landslide-report","tag-new-zealand","tag-planet-labs"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/37156","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=37156"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/37156\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/37161"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=37156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=37156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=37156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}