Due to heavy rains the loose slope forming material got 
oversaturated and lost it's shearing strength due to increased
pore water pressure within the thick overburden which had 
initiated the slide.
Report on the preliminary post disaster landslide studies in and around Tawang Town, Tawang District, Arunachal Pradesh by W. S. Rocky and G. Rongmei, Senior Geologist,Engineering Geology Division & S.C. Keshari, Senior Geologist, SU: GSI, Itanagar,  Geo
Namet Slide
Training of nala, construction of lined roadside drains and retaining wall
Loss of bearing strength of slope formimg material