Abstract's details

The 2022 Honga Tonga Tsunami monitored by satellite altimetry and SAR

Yannice Faugere (CLS Space Oceanography Division, France)

CoAuthors

Romain Husson (CLS, France); Gerald Dibarboure (CNES, France)

Event: 2022 Ocean Surface Topography Science Team Meeting

Session: Application development for Operations

Presentation type: Type Oral

The Hunga-Tonga submarine volcano produced a violent explosion on Saturday 15/01/2022 at approximately 04:15 UT (17:15 local time). The explosion generated a tsunami affecting all the Pacific Ocean.
The tsunami has been detected in the multimission (Duacs) operational Sea Level products ingesting the flying altimeters Jason-3, Sentinel-3A, Sentinel-3B provided by Eumetsat, Cryosat-2, Saral, HY-2B provided by Cnes. After a specific processing carried out to remove the natural variability of the ocean, the tsunami signal was detected very clearly in the constellation, notably on HY2B, first to fly over the area 1h30 after the eruption. Comparisons to models show a position mismatch in the NRT predictions, demonstrating the interest of altimetry in tsunami analyses.
The signature of the tsunami was also detected in radar images from the Copernicus Sentinel-1A synthetic aperture radar (SAR) satellite. the peak wavelength of the retrieved waves was estimated allowing us to track them back near the center of the eruption, therefore confirming that they were generated by this event.
This paper describes the tsunami signal as observed by the altimetry constellation and Sentinel1A.

 

Oral presentation show times:

Room Start Date End Date
Sala Pasinetti Wed, Nov 02 2022,09:15 Wed, Nov 02 2022,09:30
Yannice Faugere
CLS Space Oceanography Division
France
yfaugere@cls.fr