In  this case a mass movement of ice, not rock and soil, on the Ilulissat Glacier in Western Greenland, a part of the film Chasing Ice.  It is genuinely astonishing – the volume of the collapse is apparently 7.4 cubic kilometres.

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Note how the system progressively destabilises.  The failure event is absolutely fascinating.

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Thanks to Ellen Hardy and Peter Weisinger for the heads up.  My host research institute, IHRR, has arranged a showing of the film, and a panel discussion, in conjunction with the Star and Shadow Cinema in Newcastle on 18th April.