{"id":39129,"date":"2021-10-05T07:00:51","date_gmt":"2021-10-05T07:00:51","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=39129"},"modified":"2021-10-05T07:00:51","modified_gmt":"2021-10-05T07:00:51","slug":"a-significant-landslide-near-to-the-water-supply-pipeline-for-gisborne-in-new-zealand","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/10\/05\/a-significant-landslide-near-to-the-water-supply-pipeline-for-gisborne-in-new-zealand\/","title":{"rendered":"A significant landslide near to the water supply pipeline for Gisborne in New Zealand"},"content":{"rendered":"

A significant landslide near to the water supply pipeline for Gisborne in New Zealand<\/h4>\n

Loyal reader Dr Murry Cave of Gisborne District Council has kindly highlighted an interesting landslide, close to the water supply pipeline for the city of Gisborne in New Zealand.\u00a0 \u00a0The image below, provided by Murry, shows the landslide, which occurred on 27-28 September 2021:<\/p>\n

\"A

A new landslide near to Gisborne in New Zealand. Image courtesy of Dr Murry Cave.<\/p><\/div>\n

.<\/p>\n

The landslide covers an area of 5,440 square metres.\u00a0 The vertical image below shows its extent and the tension cracking around the rear scarp:-<\/p>\n

\"A

A vertical aerial photograph of the new landslide near to Gisborne in New Zealand. Image courtesy of Dr Murry Cave.<\/p><\/div>\n

.<\/p>\n

The location of this landslide is -38.802, 177.792 if you want to take a look.\u00a0 Note that the slip is on the outside of the bend, suggesting that toe erosion may have played a role in its initiation.\u00a0 The landscape of this area of New Zealand is dominated by natural landslides, so a failure is not unusual or surprising, but clearly in this case it is potentially problematic given the water supply pipe.<\/p>\n

Perhaps the most interesting aspect of this landslide is that it has occurred at the toe of a very much larger landslide complex.\u00a0 Murry has kindly provided this annotated image of the site site, with the 27-28 September landslide on the west side:-<\/p>\n

\"Annotated

Annotated vertical image of the site of the new landslide near to Gisborne in New Zealand. Image courtesy of Dr Murry Cave.<\/p><\/div>\n

.<\/p>\n

Note that the main landslide complex extends right up to the ridgeline.\u00a0 The risk is that the failure of the toe of this much larger complex will lead to movement on a greater scale, and indeed as the image above highlights, there are signs that parts of the complex have reactivated.<\/p>\n

This will now require careful monitoring as a failure on this scale could threaten the pipeline, which can be seen on the west side of the image above.\u00a0 This will require careful monitoring.\u00a0 New Zealand has very extensive experience of dealing with these types of hazards.<\/p>\n

New Zealand is now leaving the wetter winter period, so for a few months the risk of a major failure will reduce.\u00a0 However, early in the new year the cyclone season will bring a risk of further heavy rainfall events.<\/p>\n","protected":false},"excerpt":{"rendered":"

Dr Murry Cave of Gisborne District Council has kindly highlighted an interesting landslide, close to the water supply pipeline for the city of Gisborne in New Zealand. The landslide occurred on 27-28 September 2021 <\/p>\n","protected":false},"author":22,"featured_media":39132,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[469,959,7,636],"class_list":["post-39129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-featured","tag-landslide-report","tag-new-zealand","tag-reactivation"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/39129","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=39129"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/39129\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/39132"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=39129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=39129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=39129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}