Age estimates of coastal terraces in the Andaman and Nicobar Islands and their tectonic implications
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Age estimates of coastal terraces in the Andaman and Nicobar Islands and their
tectonic implications
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| Creator |
Earnest, Anil
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| Subject |
Computational Seismology
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| Description |
The great Indian Ocean earthquake of December 26, 2004 caused significant vertical changes in its rupture
zone. About 800 km of the rupture is along the Andaman and Nicobar Islands, which forms the outer arc
ridge of the subduction zone. Coseismic deformation along the exposed land could be observed as uplift/
subsidence. Here we analyze the morphological features along the coast of the Andaman and Nicobar Islands,
in an effort to reconstruct the past tectonics, taking cues from the coseismic effects.We obtained radiocarbon
dates from coastal terraces of the island belt and used them to compute uplift rates, which vary from
1.33 mm yr−1 in the Little Andaman to 2.80 mm yr−1 in South Andaman and 2.45 mm yr−1 in the North
Andaman. Our radiocarbon dates converge on ∼600 yr and ∼1000 yr old coastal uplifts, which we attribute
to the level changes due to two major previous subduction earthquakes in the region.
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| Publisher |
Elsevier
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| Date |
2008
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/142/1/Tectono_2008.pdf
Earnest, Anil (2008) Age estimates of coastal terraces in the Andaman and Nicobar Islands and their tectonic implications. Tectonophysics, 455. pp. 53-60. |
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| Relation |
http://www.elsevier.com/ locate/tecto
http://cir.cmmacs.ernet.in/142/ |
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