Hunga Tonga volcanic eruption research

Scientific research into the 2022 Hunga Tonga-Hunga Ha’apai eruption has detailed the event’s massive geological and atmospheric impacts. Studies published in Nature Geoscience have reconstructed the seafloor transformation, noting that the eruption caused a rapid submarine caldera collapse. The caldera, which previously had a depth of 150 to 200 meters and a diameter of approximately 4.5 kilometers, saw its floor descend to about 850 meters, with some northwestern sectors dropping between 800 and 1,100 meters. The diameter also expanded to roughly 4.8 kilometers.

This process displaced an estimated 8.9 cubic kilometers of volcanic material. Researchers determined that the “rapid, piston-like descent of the caldera floor” was a primary driver in generating destructive volcanic-tsunamis, which produced waves exceeding 40 meters in height within 100 kilometers of the volcano. The eruption also sent ash and steam 55 kilometers into the atmosphere, created global atmospheric pressure waves, and damaged subsea communication cables.

Beyond geological shifts, researchers discovered atmospheric consequences. Observations of high formaldehyde concentrations via satellite suggest the massive volcanic cloud acted to destroy methane pollution, continuously breaking down methane for over a week as the cloud traveled toward South America.