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Factors guiding tsunami surge at the Nagapattinam–Cuddalore shelf, Tamil Nadu, east coast of India

DRS at CSIR-National Institute of Oceanography

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Title Factors guiding tsunami surge at the Nagapattinam–Cuddalore shelf, Tamil Nadu, east coast of India
 
Creator Murthy, K.S.R.
Subrahmanyam, A.S.
Murty, G.P.S.
Sarma, K.V.L.N.S.
Subrahmanyam, V.
Rao, K.M.
Rani, P.S.
Anuradha, A.
Adilakshmi, B.
Devi, T.S.
 
Subject Basement structure
Cuddalore–Nagapattinam
tsunami surge
shelf morphology
 
Description The Tamil Nadu margin, in particular the Nagapattinam–Cuddalore shelf was the worst affected by the tsunami surge and inundation caused by the great Sumatra earthquake of 26 December 2004 (Mw 9.3). Surge heights in this part were of the order of 2 to 5 m, with inundation of the order of few hundred metres into the interior coast, thus causing huge loss of human life and property. Several reasons were attributed to the unusual surge in this part of the Tamil Nadu margin, the main reason being its relative proximity to the origin of the event, apart from the concave nature of the shelf with a gentle gradient. A detailed analysis of geophysical data of the Nagapattinam–Cuddalore shelf is presented. The results indicate that the structure of the underlying basement, the morphology and the land–ocean tectonics are the main guiding factors for the run-up heights in case of the Nagapattinam–Cuddalore shelf. The faultcontrolled basement structure, and a straight coastline with narrow and gentle shelf have helped in rapid transgression of the surge inundating the coastal area.
 
Date 2006-06-15T07:33:59Z
2006-06-15T07:33:59Z
2006
 
Type Journal Article
 
Identifier Current Science, Vol. 90(11),1535-1538
http://drs.nio.org/drs/handle/2264/118
 
Language en
 
Format 245760 bytes
application/pdf
 
Publisher Indian Academy of Sciences