As per the local peoples' taxi association , a rockslide was triggered near Sikkim Supreme on NH 31-A on 26 August 2014 morning by heavy down pour in Sikkim. Due to the slide and blockage, the NH-31A affected the normal communication between Gangtok and
Megotsohe, C., et al., 2014. Updation of existing landslide inventory of North Eastern Region. GSI, RHQ, NER, Shillong,  Item Code: SER/NER/RHQ/2014/037; Unpub. GSI Report of FS 2014-2015
The main cause of the slide maybe due to the rainfall and surface runoff water on the road bench
6 km from Martam
0.5 km before Sikkim Supreme (On NH-31A)
Reduction in strength on supersaturation and pore water pressure