A rock fall was reported from Punnasseri colony, Naranganam village, Pathanamthitta district. On the upslope portion of the colony, a long N-S trending ridge exists, which is of jointed granite gneiss. Three prominent joint sets were present in the ridge
On the near viscinity of downslope portion of the rock fall, about 7 houses are present, belonging to Punnasseri colony.  On the ridge top, root wedging is observed along vertical joints where the joints are detached and are at dangerous condition. One s
Punnassery colony rock fall
Punnassery colony, Naranganam.
Use of geo-grid along the highly jointed slope, removal of unstable/overhanging boulders.
Due to torrential rainfall and development of closely spaced cross cutting joints along a north-south trending ridge with vertical slope, a block of rock measuring 10m length and 3 m width fell down and rolled down-slope t to a distance of 60m.