Use of photographs to delineate the northern and western boundaries of the Pos Selim landslide and study the northern earthflow

Abstract

A study of photographs of the Pos Selim Landslide has been carried out to determine the geometry and movement of the Northern Earthflow, to delineate the Northern Flank and the Northern Toe of the surface of rupture of the landslide and to study deterioration in the Southern Toe Buttress.

All the available stereo-pair photographs of the northern part and toe zone of the landslide were studied under the stereoscope. Site history, site record photographs were also studied. Key evidence was obtained of continuing movement of the landslide to 2010.

The Northern Earthflow was found to be moving with and not over the main landslide from October 2003 to 2010 (to the resolution of the photography).

The Northern Flank of the landslide and Northern Toe of the surface of rupture of the landslide were delineated by reference to a newly-recognised Northern Deformation Area.

The observations made are recorded by updating the file Geomorphology_ September_20052D , updated by Choi (2010).