A video about the Quick Clay Landslide at Rissa - 1978 (with English commentary).
Description: On the 29th of April 1978, a quick clay landslide devastated large areas of the rural district of Rissa, Norway. One person died and: 13 farms; 2 homes; a cabin and a community center were taken by the landslide. Five to six million cubic meters of clay collapsed from an area of 330,000 m2 leaving a 1.5 kilometer slide face. The landslide caused great material damage to the community of Leira when a resulting three-meter high floodwave breached the opposite bank of Lake Botnen shortly after the main slide. The Rissa landslide was caught on 8 mm cinefilm by two film amateurs. This is still used actively in avalanche preventative and educational work.
Information About Sensitive Clays (also known as quick clay or sensitive clay) and Retrogressive Landslides:
http://pubs.usgs.gov/circ/1325/pdf/Sections/Section1.pdf : see section on Earthflows
Information About the Landslide at Lemieux (1993) Retrogressive Landslides: