Geology & landslide susceptibility mapping by using GIS application, within Sg. Ketil region, Gua Musang, Kelantan

Sungai Ketil region which is situated within Gua Musang, Kelantan encompassing a region of 25 km2 where in close proximity to latitude 4˚50’45.0” N to 4˚53’0.0” N and longitudes 102˚0’52.0” E – 101˚58’30.0” E, specifically in the south eastern direction within Gua Musang district. The purpose of this study is to update a geological map of the study area with a scale of 1: 25,000, to identify the zones within the study area which is vulnerable towards landslides and to produce a landslide susceptibility map in Sg. Ketil region in Gua Musang, Kelantan. Involved parameters are analysed based on the geological condition of the study area. This research discusses on the geomorphology, stratigraphy, structural geology, and historical geology of the study area. The region of Sg. Ketil is bounded within the Gua Musang district, Kelantan where it is involving in Gua Musang formation, one of the formation that embodied in the Central Belt of Peninsular Malaysia. Four lithology units are identified in the study area. The instability of slope may be influenced by the slope, aspect, rainfall intensity of a region, type of lithology, drainage density, structural factors as well as the land use of an area. Weighted Overlay Method (WOM) is a practical technique which enables the calculation of several parameters that are being integrated together in form of raster data set. It is a simple tool incorporated within ArcGIS software which provides a comprehensible result and is easier to operate. This assessment presents a landslide susceptibility zonation map which shows the region which is vulnerable towards landslide. It is categorizing as either low, moderate to high susceptibility towards landslide occurrences. In conclusion, discernment towards the structural mechanism is crucial to ensure the safety of a region and to prevent any unavoidable events.