Tectonic geomorphology,tsunamis and environmental hazards: reference to Andaman-Nicobar Islands |
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Authors: | A C Narayana |
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Institution: | (1) Centre for Earth and Space Sciences, University of Hyderabad, Hyderabad, 500046, India |
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Abstract: | Geomorphic features associated with earthquakes and tsunamis have received wide attention in estimating uplift and subsidence
after the tectonic event. Although various techniques are in vogue in estimating the uplift and subsidence after the 2004
Andaman-Sumatra earthquake and subsequent tsunami, remote sensing techniques have been proved to be quite handy to study the
geomorphic changes. In the present study, geomorphic changes associated with the destructive event of December 2004 have been
analyzed. The emergent and subsident coasts around the smaller islands in the Andaman region have been identified. The coral
reef area that has been subjected to uplift or subsidence in some of the islands of the Andaman and Nicobar region is delineated,
and the net areal extents of these coral beds have been computed. Of the six islands studied in Andaman region, coral reef
of four islands was subjected to uplift, and around two islands the area was subsided. The uplifted area varied from 0.10
to 11 km2, and subsidence was about 0.50 km2. In Nicobar region, the subsidence of coral reefs was recorded. This study helps to monitor the coastal environments and
the destruction due to natural hazards. |
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Keywords: | |
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