The main area of change is the advancement of the two toes at the bottom and the retreat of the
scarp at the top of the landslide (see Figure 2). The changes in landslide area are presented in Table 4.
There were five events of the little toe advancing (a total of 554 m2 during the whole monitoring
period) and three scarp retreat events. There was no noticeable change in area between the 2013A and
2013B datasets, possibly because much of the movement occurs in surges rather than a gradual creep,
and/or because movement during this short time period was too small to be measured.
The slope of the leading edge of the toes was measured by calculating the slope from the DSM and
taking a mean of all the pixels in the leading edge area (see Table 4). The steepness of the leading edge
gradually builds up, particularly of the large toe, as material flows down from above until eventually
the leading edge collapses and the toe surges forward. This surge effect can be seen graphically in