Mustak T., and Raj, E. M., 2017. Macro-scale (1:50,000) Landslide Susceptibility Mapping in parts of Toposheets nos. 83 K/1 and 83K/5, Tkohima, Phek, Wokha and Zunheboto districts , Nagaland. Unpubl. GSI report FS 2016-17
The overburden colluvial materials  as well as black shale  got supersaturated due to flowing spring water and steep slope also favours for the event .
Metsalumi
Retention wall of (50*1.5) meters can be made and weep holes can be arranged to remove the flowing spring water. Benching can be made to reduce the steepness of the slope.