Landslide Occurrences in Malaysia Based on Soil Series and Lithology Factors
Past researchers have created various techniques to analyse landslide occurrences. Those techniques utilize qualitative, quantitative or semi-quantitative approaches. Each technique poses advantages and disadvantages depending on the available information, landslide inventory or area of interest. In Malaysia, landslides have become an alarming issue and fatalities are increasing in every event. These fatalities can be reduced if the landslide prone areas are mapped using zonation techniques. The main aim of this research is to produce a hazard risk map using the susceptibility index based on soil series and strata lithology in the state of Selangor, Malaysia. Over the past 20 years, this state has developed rapidly, and many housing schemes have been developed to accommodate high market demand. Moreover, this state has contributed the largest number of landslide tragedies in the past compared to the other states. Susceptibility index based on soil series and strata lithology provides high reliability after validation with past tragedies. Analytical Hierarchal Index (AHP) has been deployed to find the ranking and susceptibility index for those two factors. It was found that urban land soil series and acid intrusive lithology provide higher weightage of landslide susceptibility compared to other series or lithology. Any locations with those series and lithology will pose a critical level of landslide vulnerability. The overlaying of various series and lithology on the state of Selangor map reveals that three provinces, namely Gombak, Petaling and Hulu Langat should be given special attention should future development is to be carried out in these territories.