Earth’s biggest volcanic event transformed an entire oceanic plate
Summary
Seismic imaging shows the plate beneath the Ontong Java Plateau contains stacked horizontal layers cut by extensive vertical magma conduits. Unusually slow seismic waves indicate deep-sourced magma chemically altered the plate, not just built the volcanic plateau on top.
Why it matters
Plate-scale alteration implies mega-volcanism can reset oceanic lithosphere properties, reshaping how we model Earth’s interior and tectonics.