Toe erosion by high current of river due to heavy flash flood and gully erosion led to development of pore pressure and reduction of shear strength due to water percolation led to this landslide 

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)
Lithological contact of gneiss and schist with phyllitic slate passing immediately downstream of the area.
UK/Pith/ Tawaghat-Jauljibi/LS/0047
State Highway
Flood protection wall, retaining wall towards hill side with weep holes and toe drains
The major geological causes are presence of loose/unconsolidated material, toe erosion in soil/debris due to heavy flash flood and gully erosion. Also the development of pore water pressure and reduction of shear strength due to water percolation added t