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Coseismic uplift, slow plant mortality and ecological impact in North Andaman following the December 2004 (M sub(w) > 9.2) earthquake
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Coseismic uplift, slow plant mortality and ecological impact in North Andaman following the December 2004 (M sub(w) > 9.2) earthquake
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Coseismic uplift, slow plant mortality and ecological impact in North Andaman following the December 2004 (M sub(w) > 9.2) earthquake
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Journal Article
Coseismic uplift, slow plant mortality and ecological impact in North Andaman following the December 2004 (M sub(w) > 9.2) earthquake
2011
Overview
We present here the phenomenon of gradual decay leading to plant mortality in vast stretches (measuring several square kilometres) of vibrant mangrove forests in the coastal wetlands of North and Middle Andaman. We interpret the phenomenon as an effect of static ground uplift following the 26 December 2004 Sumatra-Andaman earthquake. The decimetre to metre scale uplift has cut-off tidal water flow into those parts of the wetlands that were elevated from intertidal to supratidal levels. The consequent thermal shock, desiccation and gradual depletion of soil salinity affected the plants in the elevated parts. However, desiccation due to lack of tidal-water inflow caused the plant mortality which took the proportions of an ecological disaster about three to four years after the earthquake. The voluminous forest debris produced by the withered plants is likely to be preserved in the coastal sedimentary sequences as peat beds and serve as palaeoseismic indicators.
