With latest satellite imagery, we get a step closer to understand what happen with Hunga #Tonga leading to this ocean-wide #tsunami.
Latest @sentinel_hub imagery shows the loss of a majority of the volcano's emerged landmass. However, most of its structure lies underwater.
Latest @sentinel_hub imagery shows the loss of a majority of the volcano's emerged landmass. However, most of its structure lies underwater.
Assuming that most of the volcanic dome was still intact prior to the main eruption, an area of about 2.5 km² was lost. With a height of 150-200m, we can assume that about 0.5 km³ of mass might has been moved.
If parts of the caldera have collapsed it might be much more.
If parts of the caldera have collapsed it might be much more.
Some parts of the volcano had already drowned during yesterday's (Jan 14th) eruption. As shown by satellite imagery from @planet taken just about 2h before the main eruption.
https://twitter.com/RaphaelGrandin/status/1482405936874627072
The right image was taken from a study in 2017 by Cronin et al., which can be found here @AGU_Eos
Definitely worth a read!
eos.org/science-update…
Definitely worth a read!
eos.org/science-update…
Still, we know little about the situation on Tonga itself and how severe the island was hit (from my point of view, everything is possible).
It is also still unclear why the tsunami wave maintained its amplitude for so long affecting so many coastlines in the Pacific.
It is also still unclear why the tsunami wave maintained its amplitude for so long affecting so many coastlines in the Pacific.
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