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15 February 2016

Sumner rockfalls – videos from the M=5.7 earthquake near Christchurch yesterday

Sumner rockfalls – videos of the landslides triggered by the M=5.7 earthquake near to Christchurch in New Zealand yesterday

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30 September 2015

Rockfall and landslide damage in the Port Hills from the Christchurch earthquake sequence

Demolition has started of properties damaged by landslides in the Port Hills area of Christchurch during the 2010-2011 earthquakes. This post shows some of the photographs that I took shortly afterwards.

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11 March 2011

Liquefaction in an aftershock

I stumbled upon a fascinating video a couple of weeks ago showing what happens to sand volcanoes as seismic waves pass. This would have fit in either my aftershocks or my liquefaction posts from last week, but it’s both stunning and unique so I decided it deserves a post of its own. http://www.youtube.com/watch?v=Nv–8ybjnwk   This New Zealand man is filming sand blows forming from liquefaction of a school yard in …

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4 March 2011

Liquefaction in New Zealand

One of the ubiquitous features of the nice flat sedimentary plains where people tend to prefer building cities, suburbs, or at least vast agricultural tracts, is that they generally liquefy when subjected to strong shaking. The results include serious instability of the “solid” ground, flooding, and ejection of silty water in places it would certainly be best not to have water being ejected. Here’s an example from Christchurch Here’s a …

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