The slope forming material comprised of thin insitu soil layer and weathered and fragmented shale and siltstone got oversaturated during torrential rainfall and due to pore water pressure, it lost the cohesion and failure occurred.
Tep, Y. and Kumar, A. (2018); MacroScale (1:50,000) Landslide Susceptibility Mapping in Toposheet nos. 83C/16 and 83H/1 in  Dima Hasao and Cachar districts in Asam and East Jaintia hills  District in  Meghalaya and West and Central MNipur district in MNi
The landslide is of small dimension however considering the regional importance of this road (NH54); remedial measures suggested should be carried out to arrest further slope failure.
Bandarkhal8
NH54
Toe support for the affected slope through construction of strong RCC retaining wall with sufficient weep holes founded on sound substratum. Construction and proper maintenance of concrete road side drain.
Oversaturation of slope forming material and increase in local pore water pressure during torrential rainfall. Loose of toe support due to extensive slope cut along NH4.Weak lithology comprised of fragmented and highly jointed sandstone and friable shale