Hunga Caldera Deepened 700 Meters and Widened to 4.8 Km in 2022 Eruption
Updated
Updated · Nature.com · Sep 11
Hunga Caldera Deepened 700 Meters and Widened to 4.8 Km in 2022 Eruption
1 articles · Updated · Nature.com · Sep 11
Summary
Seafloor mapping shows Hunga’s caldera plunged from about 150 meters to 850 meters deep after the Jan. 15, 2022 eruption, while widening from roughly 4.5 km to 4.8 km.
8.9 cubic km of material was displaced, including 6.85 cubic km from caldera collapse, as magma withdrawal created underpressure that triggered rapid piston-style subsidence during the eruption.
Landslide deposits mixed with pyroclastic infill indicate the collapse happened syn-eruption, and researchers estimate at least 8 cubic km of magma erupted—less than 30% of the reservoir.
The collapse likely amplified the tsunami from the eruption, which sent waves up to about 40 meters high, underscoring how even relatively small submarine calderas can generate outsized hazards.
Why did a submarine volcano collapse so violently when more than seventy percent of its magma remained trapped beneath the seafloor?
Are hidden underwater calderas silently threatening global communication networks without any real-time acoustic warning systems currently in place?
Could mysterious underwater acoustic signals hold the key to predicting devastating tsunamis before they strike coastal cities?
Aftermath of the 2022 Hunga Tonga–Hunga Haʻapai Eruption: $182 Million in Damages, Global Tsunami Gaps, and Lessons for Early Warning Systems
Overview
The January 2022 Hunga Tonga–Hunga Haʻapai eruption began with an undersea blast that destroyed part of the island, allowing seawater to flood the volcanic vent. This triggered a massive explosion, sending a towering eruption column into the mesosphere and injecting huge amounts of water vapor into the stratosphere. The resulting chemical reactions rapidly formed ultra-fine sulfate aerosols, which reflected sunlight and caused a slight global cooling, temporarily masking some human-driven warming. The eruption also caused a deep caldera collapse and a giant tsunami, devastating Tonga’s infrastructure and coral reefs, and even triggering an oil spill disaster in Peru. These events exposed weaknesses in early warning systems, prompting global shifts toward multi-modal disaster monitoring and climate-resilient recovery.