This slide was triggered by continuous rainfall on steep slope causing excessive saturation and lubrication of loose rock mass. 

An interim report on Preliminary slope stability assessment of recent disaster affected areas of Pithoragarh District, Uttarakhand by A Bishwapriya, Suptg. Geologist, M V Dhakate and P K Gajbaiye, Sr Geologist, M IV, NR,Dehradun (LHZ/NR/UPUK/2013/056)
UK/Pith/Thal-Munsyari/LS/0006
Phulibagar Village
Removal of entire volume of debris and regrading of slope to mild angle
The major geological causes are excessive saturation of loose mass by surface and subsurface water, development of pore water pressure ultimately resulting in shear strength of the material and gully erosion in soil/debris during rainy season.