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The earthquake and tsunami of 1865 November 17: evidence for far-field tsunami hazard from Tonga

Synolakis Kostas, José Borrero, Okal, Emile A

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URI: http://purl.tuc.gr/dl/dias/10274632-EBAF-4480-82C7-F337EABE38EE
Year 2004
Type of Item Peer-Reviewed Journal Publication
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Bibliographic Citation E. A. Okal, J Borrero , C. E. Synolakis,"The earthquake and tsunami of 1865 November 17: evidence for far-field tsunami hazard from Tonga",Geophys. J. Int. , vol. 157 ,no.1,pp.164-174,2004. doi: 10.1111/j.1365-246X.2004.02177.x https://doi.org/10.1111/j.1365-246X.2004.02177.x
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Summary

Historical reports of an earthquake in Tonga in 1865 November identify it as the only event from that subduction zone which generated a far-field tsunami observable without instruments. Run-up heights reached 2 m in Rarotonga and 80 cm in the Marquesas Islands. Hydrodynamic simulations require a moment of 4 × 1028 dyn cm, a value significantly larger than previous estimates of the maximum size of earthquake to be expected at the Tonga subduction zone. This warrants an upwards re-evaluation of the tsunami risk from Tonga to the Cook Islands and the various Polynesian chains, which had hitherto been regarded as minor.

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