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Rupture process of the 2004 great Sumatra-Andaman earthquake estimated from tsunami waveforms

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Abstract

Rupture process of the 2004 Sumatra-Andaman earthquake is estimated using tsunami waveforms observed at tide gauges and the coseismic vertical deformation observed along the coast. The average rupture speed of the 2004 Sumatra-Andaman earthquake is estimated to be 1.7 km/s from tsunami waveform analysis. The rupture extends about 1200 km toward north-northwest along the Andaman trough. The largest slip of 23 m is estimated on the plate interface off the northwest coast in the Aceh province in Sumatra. Another large slip of 21 m is also estimated on the plate interface beneath the north of Simeulue Island in Indonesia. The other large slip of 10–15 m is estimated on the plate interface near Little Andaman and Car Nicobar Inlands. The total seismic moment is calculated to be 7.2 × 1022 Nm (Mw 9.2) which is similar to the other studies using seismic waves (Park et al., 2005; Ammon et al., 2005).

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Correspondence to Yuichiro Tanioka.

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Tanioka, Y., Yudhicara, Kususose, T. et al. Rupture process of the 2004 great Sumatra-Andaman earthquake estimated from tsunami waveforms. Earth Planet Sp 58, 203–209 (2006) doi:10.1186/BF03353379

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Key words

  • 2004 Sumatra-Andaman tsunami
  • numerical simulation
  • tsunami waveform inversion
  • slip distribution