Story perspectives

Rare Quantum Seafloor Spreading Shifts Ridge by Meters

7/10/2026

Summary

Story summary

Scientists recorded a rare “quantum” seafloor-spreading episode that moved the ocean floor by meters.
Jean-Yves Royer’s team measured the event at the Southeast Indian Ridge near Amsterdam Island in April 2024.
The ridge pulled apart at five centimeters per minute, creating two to four meters of displacement.
Dike intrusions caused a 4.2-meter collapse of the ridge axis, with most motion aseismic, providing ground-truth data to reconcile earthquake slip and spreading rates.

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Story summary

Scientists recorded a rare “quantum” seafloor-spreading episode that moved the ocean floor by meters.
Jean-Yves Royer’s team measured the event at the Southeast Indian Ridge near Amsterdam Island in April 2024.
The ridge pulled apart at five centimeters per minute, creating two to four meters of displacement.
Dike intrusions caused a 4.2-meter collapse of the ridge axis, with most motion aseismic, providing ground-truth data to reconcile earthquake slip and spreading rates.