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

Astronomy and Astrophysics – Astronomy

Scientific paper

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Historical Earthquakes, Tonga Islands, Tsunami Hazard, Tsunami Simulation

Scientific paper

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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