Can volcanic eruptions trigger tsunamis without earthquakes?

Yes. The Hunga Tonga eruption generated tsunamis through rapid steam-driven displacement, caldera collapse, and seafloor slope failure. These processes operate independently of tectonic rupture.

Why did the shockwave travel so far?

The blast produced a Lamb wave that propagated efficiently through the atmosphere with low attenuation. Pressure sensors detected the pulse thousands of kilometres from the source.

Are the eruption’s effects still measurable in 2025?

Yes. Persistent elevated stratospheric water vapor, continued seafloor instability, and atmospheric propagation research remain active topics.

Does current tsunami design guidance cover volcanic triggers?

Mostly indirectly. Standards primarily address seismic tsunamis. Volcanic tsunami loading and multi-pulse wave trains are not consistently represented in codes and require further integration.

Satellite view of the Hunga Tonga eruption plume annotated for engineering hazards — Satellite plume showing vertical ash and steam column during the 2022 Hunga Tonga eruption.

Hunga Tonga–Hunga Haʻapai Eruption: Engineering Implications and Emerging 2025 Insights

On 15 January 2022, the Hunga Tonga–Hunga Haʻapai submarine volcano erupted in the South Pacific and produced effects that exceeded expectations for a volcanic event of its size. While media coverage focused on dramatic satellite images, the scientific community recognized the eruption as a rare opportunity to study high-energy phreatomagmatic explosions and their cascading hazard...