A progressive failure of quick clay during a quick-clay landslide (called a flow slide). A flow slide often begins with a small slump of clay from the bottom of an embankment that has been eroded or undercut. The removal of this material places a shear stress on the material above it on the slope. This material also slumps and a series of failures advances up the slope, sometimes at a rate of several metres per second.
Subjects: Earth Sciences and Geography.