Sri Lanka, Dec. 15 -- Landslides are a natural phenomenon that occur across the world due to factors such as rainfall, earthquakes, volcanic activity among others. However, in Sri Lanka, landslides occur primarily as a result of rainfall, according to Senior Geologist Dr. Wasantha Senadeera of the National Building Research Organisation (NBRO).

Dr. Senadeera stated that landslide warning notices are issued under three stages, namely Level One, Level Two, and Red Evacuation Notices.

Dr. Wasantha Senadeera noted that these warnings are categorized based on numerical values derived from recorded rainfall levels in the relevant areas.

He emphasized that the issuance of Red Notices does not imply that only those areas will experience landsl...