{"id":25592,"date":"2017-09-16T23:19:24","date_gmt":"2017-09-16T23:19:24","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=25592"},"modified":"2017-09-16T23:19:24","modified_gmt":"2017-09-16T23:19:24","slug":"hapuku-landslide","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2017\/09\/16\/hapuku-landslide\/","title":{"rendered":"Landslides from the Kaikoura Earthquake part 2: the Hapuku landslide"},"content":{"rendered":"

Landslides from the Kaikoura Earthquake part 2: the Hapuku landslide<\/h4>\n

The longest runout slide triggered by the Kaikoura Earthquake<\/a> was the Hapuku landslide, which occurred high up in the catchmnet of the Hapuku River.\u00a0 This landslide is at -42.237, 173.664 if you want to take a look on Google Earth.\u00a0 This landslide is a long (2.7 km) rock avalanche with a volume of about 10-14 million cubic metres<\/a>.\u00a0 The elevation change from the crown (which is at the ridge top) to the toe is about 1,900 metres. To get a full appreciation of this landslide the Google Earth imagery is helpful:-<\/p>\n

\"Hapuku

Google Earth image of the Hapuku landslide, triggered by the Kaikoura earthquake<\/p><\/div>\n

.<\/p>\n

As the image shows, the landslide crown is at the ridge line (which is common for earthquake triggered landslides), whilst the debris at the toe has blocked the valley.<\/p>\n

This is a helicopter image of the upper portion of the landslide:<\/p>\n

\"Hapuku

The upper portion of the Hapuku landslide<\/p><\/div>\n

.<\/p>\n

This suggests that the failure event in the upper portion of the landslide was complex, and that there is still some debris on the slope.\u00a0 The image below shows the track of the landslide to the toe:-<\/p>\n

\"Hapuku

The track of the Hapuku landslide.<\/p><\/div>\n

.<\/p>\n

Note the small remaining lake caused by the blockage of the channel (the breach is also visible).\u00a0 The landslide has left a large amount of bare rock.\u00a0 This image shows the landslide debris:-<\/p>\n

\"Hapuku

The deposit of the Hapuku landslide<\/p><\/div>\n

.<\/p>\n

The landslide dam has breached – this image shows the breach channel clearly:<\/p>\n

\"Hapuku

The breach channel from the Hapuku landslide dam<\/p><\/div>\n

 <\/p>\n

As with many other locations, this landslide has seen some secondary failures in periods of heavy rainfall since the Kaikoura earthquake:<\/p>\n

\"Hapuku

Tracks from secondary failures at the Hapuku landslide<\/p><\/div>\n

.<\/p>\n

As with the Seaward landslide<\/a>, one of the fault ruptures runs through the scar of the this landslide.\u00a0 It is therefore unsurprising that there are many other landslides triggered by the Kaikoura earthquake in this area:<\/p>\n

\"Hapuku

Other landslides triggered by the Kaikoura earthquake in the catchment of the Hapuku River<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

The largest landslide triggered by the Kaikoura earthquake was the valley-blocking Hapuku landslide, an impressive 2.7 km long rock avalanche<\/p>\n","protected":false},"author":22,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[537],"tags":[23,469,1213,15,8581,306],"class_list":["post-25592","post","type-post","status-publish","format-standard","hentry","category-earthquake-induced-landslide","tag-earthquake","tag-featured","tag-kaikoura","tag-landslide-dam","tag-new-zea-landslide","tag-rock-avalanche"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/25592","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=25592"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/25592\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=25592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=25592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=25592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}