ABSTRACT
Penang and North Sumatra are two of the regions which seldom have cases of slope instability which causes landslides. Two different site for the study are in the Penang Island, Malaysia and the North Sumatera along Medan-Brastagi Road, Indonesia where the condition for both sites seem to be similar where the area are prone to its natural disaster which lead to landslide after the area has been developed either for road construction, building a housing scheme or a resort development. The condition of the area development that took place required to cut and fill along the terrain and usually the hill site are made of rough topography with undulating hill site reliefs and the slope angles are between 60°-90°. The literature on landslide susceptibility analysis will be reviewed in accordance to its geological formation and the rainfall analysis that has shown the triggering factors after rainfall event. The main summary of the incidences will be reviewed and classification approaches that have been developed to study the parameters, methodologies, and tools used to obtain a landslide hazard map. Base on the hazard map, the area can then be identified and verified by identification the main factor that causes the slopes failure/landslides. In summary the numbers of site in hillside development in Malaysia or Indonesia are due to rainfall, storm water activities and poor slope management and maintenance. Therefore, it is important to practice good planning, proper design, sustainable construction and regular maintenance so as to achieve a community safe slope and cost-effective hill site development.
