Geology and landslide potential analysis using geographic information system(GIS) in Kampung Kalai, Jeli, Kelantan

Kampung Kalai is in the district of Jeli, Kelantan and dominated by small community. The study area covers 32km2 which aligned within latitude 5°46'44.96"N to 5°42'24.58"N and longitude 101°44'26.51"E to 101°42'16.53"E. Kampung Kalai’s landscape is plain areas and slightly hilly areas. The highest elevation is 680 meters, and the lowest elevation is 40 meters respectively found near Gunung Reng. In the research study, landslides often occur at the highest elevation due to the effects of gravity. This study aims to generate the geological map of Kampung Kalai, Jeli, Kelantan with scale 1: 25 000. The factors that triggered the landslide risk potential at Kampung Kalai were also analysed. Geological mapping for the present project relies on fieldwork, including collecting samples from fresh outcrops and observing geomorphological features, drainage patterns, and others. Lithological findings in Kampung Kalai are schist, meta quartz rich granitoid and meta mudrock that ranging from the Triassic to the Carboniferous eras. Faults and folds were also found during structural trends recorded in rocks. Geological map was generated using GIS-based platform that processed all field data, including petrographic analysis. For landslides potential study, a raster-based GIS was used to generate thematic maps of six (6) variables including lithology, slope, aspect, lineament density, land use, and drainage density. The final output of landslide potential analysis map was created in ArcGIS using the Weightage Overlay Method (WOM). The results classify the potential map into three zones: low (50%), moderate (50-75%), and high (>75%). It was determined that the landslide happened due to the lithology and the slope. As a conclusion, this research gives accurate identification of the most likely failure spots within a landslide-prone zone.