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The 26 December 2004 Sumatra Tsunami recorded on the coast of west Africa

Joseph, A.; Odametey, J. T.; Nkebi, E. K.; Pereira, A.; Prabhudesail, R. G.; Mehra, P.; Rabinovich, A. B.; Kumar, V.; Prabhu-Desai, S.; Woodworth, P. L.. 2006 The 26 December 2004 Sumatra Tsunami recorded on the coast of west Africa. African Journal of Marine Science, 28 (3-4). 705-712.

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Abstract/Summary

Analysis of sea-level data obtained from the Atlantic Global Sea Level Observing System (GLOSS) sea-level station at Takoradi, Ghana, West Africa, clearly reveals a tsunami signal associated with the Mw = 9.3 Sumatra earthquake of 26 December 2004 in the Indian Ocean. The tsunami arrived at this location on 27 December 2004 at approximately 01:38 UTC (which is close to the expected tsunami arrival time at that site), after travelling for more than 24 hours. The first wave was negative (trough), in contrast with the South African stations where the first wave was mainly positive (crest). The dominant observed period at Takoradi was about 42 minutes. The maximum trough-to-crest wave height (41cm) was observed on 28 December at 00:15 UTC. There were two distinct tsunami 'bursts', separated in time by about 14 hours, the larger being the second burst. A small residual lowering of the sea level (∼15cm) during the tsunami and for several days afterwards, and a delayed (∼4.5 days) lowering of seawater temperature (up to ∼4.5°C), was observed, possibly indicating the presence of internal waves through the Gulf of Guinea associated with propagating tsunami waves. The prominent tsunami signal found in the Takoradi record suggests that tsunami waves could also be found at other sites off the West African coast

Item Type: Publication - Article
Programmes: Oceans 2025 > Climate, ocean circulation and sea level
ISSN: 1814-232X
Additional Keywords: ATLANTIC OCEAN; FOCUSING; GHANA; GLOSS; GULF OF GUINEA; INTERNAL WAVES; REFLECTION; SEA LEVEL CHANGES; TIDE GAUGE; TSUNAMI WAVE; WEST AFRICA
NORA Subject Terms: Marine Sciences
Date made live: 30 Sep 2008 16:41
URI: http://nora.nerc.ac.uk/id/eprint/2089

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