Why does seafloor spreading happen faster in the Pacific Ocean than in the Atlantic Ocean?

Seafloor spreading rates vary significantly across the globe, with the Pacific Ocean exhibiting much faster rates than the Atlantic Ocean. While the specific mechanisms driving these differing velocities are complex, the variation is fundamentally linked to the dynamics of tectonic plates and the forces acting upon them.12

The rate of seafloor spreading is determined by how quickly new oceanic crust is created at spreading centres. In the Pacific, fast-spreading ridges like the East Pacific Rise can spread at rates up to 160 mm per year. In contrast, the Mid-Atlantic Ridge is a slow-spreading ridge, often characterized by a distinct rift valley at its crest.3145

These differences are influenced by forces such as:

• Ridge Push: Gravitational force pushes cooling, dense crust away from the elevated ridge, allowing new magma to rise.21
• Slab Pull: As dense oceanic plates sink into the mantle at subduction zones, they pull the rest of the plate along. The prevalence of subduction zones around the Pacific basin is a key factor in its rapid tectonic movement compared to the Atlantic.261