On factors influencing ground subsidence: A case study of Munroe Island

Munrothuruthu (‘Munroe Island’) is a place renowned for continuous settlement, in the Kollam district of Kerala. The Indian Ocean earthquake and Tsunami of 2004 triggered this major problem. The island is located at confluence of the Ashtamudi Lake and the Kallada River. Low lying regions of the island are facing progressive settlement which has become pronounced since the occurrence of Tsunami. The area has been affected by upward seepage of saline water during High Tide events, denoting the axial lowering of land mass. The salinity intrusion of Ashtamudi Lake in island has become recurrent phenomena in the region resulting in several environmental issues. The island is on the verge of sinking and settlement is rapid with time. The foundation on the site has settled and few residents have abandoned their dwelling units.

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