Natural Hazards and Earth System Sciences
Natural Hazards and Earth System Sciences
NHESS
Articles | Volume 26, issue 2
Articles | Volume 26, issue 2
https://doi.org/10.5194/nhess-26-943-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-26-943-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 2
Research article
 | 
27 Feb 2026
Research article |  | 27 Feb 2026

First mapping of a tsunami wavefield by SWOT satellite: observation data and preliminary numerical simulation of the 19 May 2023 tsunami near the Loyalty Islands

Jean H. M. Roger, Yannice Faugère, Hélène Hébert, Antoine Delepoulle, and Gérald Dibarboure

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Short summary
Deployed in 2022, the SWOT (Surface Water Ocean Topography) satellite was flying over the Southwest Pacific on 19 May 2023 when it recorded the tsunami triggered by a magnitude 7.7 earthquake south of the Vanuatu arc. For the very first time, it provided a 2D image of a tsunami wavefield along a straight path. Comparison with numerical tsunami simulations reveals good phase agreement between the modeled wavefield and the SWOT record, but the simulated amplitudes are lower than the measurements.
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