Coral microatoll as geodetic tool in North Andaman and Little Andaman,India |
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| Authors: | S K Som Vijay Shivgotra Ashim Saha |
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| Institution: | (1) Department of Geology, The University of Montana, MT, 59812, Missoula, USA |
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| Abstract: | Coral microatolls were examined from North Andaman and Little Andaman to understand the relative sea level change due to vertical
tectonic deformation above the subduction interface. The highest level of survival of coral microatoll before the 26 December,
2004 earthquake at eastern coast of North Andaman has been determined by Global Ocean Tide Model. The present position of
recently dead flat top microatoll with preserved internal structure at the eastern coast of North Andaman mainland indicates
31.21 cm uplift due to the 26 December, 2004 earthquake. Comparatively old cup shaped microatoll at the eastern fringe of
North Andaman group of islands and highly bioeroded fossil microatolls at the intertidal zone of Little Andaman bear the signature
of permanent vertical deformation in the past. |
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