{"id":25621,"date":"2017-09-17T22:06:57","date_gmt":"2017-09-17T22:06:57","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=25621"},"modified":"2017-09-19T08:05:59","modified_gmt":"2017-09-19T08:05:59","slug":"leader-220-landslide","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2017\/09\/17\/leader-220-landslide\/","title":{"rendered":"Landslides from the Kaikoura Earthquake part 3: the Leader 220 landslide"},"content":{"rendered":"

Landslides from the Kaikoura Earthquake part 3: the Leader 220 landslide<\/h4>\n

The Leader 220 landslide, located on the Leader Rover close to Woodchester (the location is -42.585, 173.215 if you want to take a look on Google Earth), is another large valley blocking landslide<\/a> triggered by the Kaikoura Earthquake in New Zealand<\/a>.\u00a0 This is one of the most spectacular and photogenic of all of the landslides:<\/p>\n

\"Leader

The Leader 220 landslide triggered by the Kaikoura earthquake<\/p><\/div>\n

.<\/p>\n

This is a large slump with a near planar, steep back scarp.\u00a0 The landslide has moved as a single block, but has extensively deformed as it transitioned from the steep back scarp to the near horizontal valley floor.\u00a0 The landslide has pushed the river across the valley floor such that it is now flowing over old terrace surfaces:<\/p>\n

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The aftermath of the Leader 220 landslide<\/p><\/div>\n

.<\/p>\n

The landslide dam has now breached but the lake remains partially intact.\u00a0 This has caused some properties to be inundated:<\/p>\n

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A property flooded by the Leader 220 landslide lake.<\/p><\/div>\n

.<\/p>\n

This is a slope that is undergoing considerable post-earthquake landslide activity.\u00a0 This image shows the foot of the main scarp, and the multiple flow type failures that have occurred:<\/p>\n

\"Leader

Post seismic flows that have occurred at the site of the Leader 220 landslide, triggered by the Kaikoura Earthquake.<\/p><\/div>\n

.<\/p>\n

The image above also shows some interesting deformation occurring at the trailing edge of the displaced block – in effect this is a landslide within a landslide as the edge of the block slumps back into the scarp depression.\u00a0 The image below shows this from a wider perspective – it is not an insubstantial landslide in its own right:<\/p>\n

 <\/p>\n

\"Leader

An overview from the scarp of the Leader 220 landslide, showing deformation in the displaced block.<\/p><\/div>\n

.<\/p>\n

Monitoring how this deformed mass behaves in the next few years will be fascinating.\u00a0 It appears that considerable post-seismic landscape evolution will occur before conditions each a new equilibrium.\u00a0 GNS Science<\/a> have a newly funded MBIE Endeavour project<\/a> for the next few years to monitor the evolution of the landscape after the earthquake.<\/p>\n

Landslides from the Kaikoura Earthquake<\/h4>\n

The earlier posts in this series are as follows:<\/p>\n