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Sediment effect on tsunami generation of the 1896 Sanriku Tsunami Earthquake - Tanioka - 2001 - Geophysical Research Letters - Wiley Online Library

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Sediment effect on tsunami generation of the 1896 Sanriku Tsunami Earthquake

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Abstract

The 1896 Sanriku earthquake was one of the most devastating tsunami earthquakes, which generated an anomalously larger tsunami than expected from its seismic waves. Previous studies indicate that the earthquake occurred beneath the accretionary wedge near the trench axis. It was pointed out recently that sediments near a toe of an inner trench slope with a large horizontal movement due to the earthquake might have caused an additional uplift. In this paper, the effect of the additional uplift to tsunami generation of the 1896 Sanriku tsunami earthquake is quantified. We estimate the slip of the earthquake by numerically computing tsunamis and comparing their waveforms with those recorded at three tide gauges. The estimated slip for the model without the additional uplift is 10.4 m, and those with the additional uplift are 5.9–6.7 m. This indicates that the additional uplift of the sediments near the trench has a large effect on the tsunami generation.

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Article Information

DOI

10.1029/2001GL013149

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© 2001 by the Chinese Geophysical Society

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Publication History

  • Issue online: 1 September 2001
  • Version of record online: 1 September 2001
  • Manuscript Accepted: 28 June 2001
  • Manuscript Received: 9 March 2001

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