RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 8, ES4004, doi:10.2205/2006ES000214, 2006
[13] The tsunami generated by the 26 December, 2004 Indian Ocean earthquake had a horizontal extent of about 1400 km. Such a large spatial dimension is apparently related to an unusually extensive crustal rupture. This supposition is in agreement with the result of preliminary study by Borges et al. [2005] showing that the duration of the Sumatra earthquake rupture process exceeded 200 s. This, in turn, means that the rupture extension was about 1000 km.
[14] This analysis demonstrates that the tsunami waves propagating southwestward across the Indian Ocean two hours after the main shock were noticeably dispersive. Together with earlier results [González and Kulikov, 1993; Kulikov and González, 1996; Okal et al., 1999] this, in turn, brings into question the accuracy of the model used for numerical simulations of tsunamis. Normally these models are based on the shallow water approximation which ignores the effect of linear wave dispersion. However, according to the results reported here, such dispersion could be significant for amplitude estimation in transoceanic tsunami propagation.
Citation: 2006), Dispersion of the Sumatra Tsunami waves in the Indian Ocean detected by satellite altimetry, Russ. J. Earth Sci., 8, ES4004, doi:10.2205/2006ES000214.
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