**3. Analysis of Thresholds**

The key for the development of any empirical threshold is the definition of rainfall and landslide events and the parameters related to it [39]. The necessity of developing rainfall thresholds and early warning systems for the Idukki district has been emphasized in some of the specific site studies conducted by the GSI [23]. Considering the increased number of casualties which occurred in the study area in the recent past, rainfall thresholds using intensity-duration relationships and antecedent rainfall conditions have been developed in the current research.
