The thick overburden consisting of highly weathered loosely packed material on over saturation during incessant rainfall led to reduction of strength. Cutting of the slope beyond angle of repose for road construction destabilized and mobilized the slope
Chasie M. &  Theophilus P.K., 2017: Updation of existing landslide inventory of North Eastern region based on the new incidences as and when occurs during the period, Unpubl. GSI progress report for FS 2016-25
Retaining wall with sufficient weep holes should be constructed in order to stop the slide mass from obstructing the road in the future. Landslide initiation not known, Reactivated in May 2016.
Harangajao Slide
NH 54, Harangajao
1. Channeling of surface drainage system.
2. Construction of gabion wall on the slope.
Geologically, the area is made up of shale, flaggy sandstone and calcareous rocks of Disang Group. Excavation/cutting of natural slope for road construction disturbed the angle of repose of the material and continuous drizzle resulted in over saturation