The ocean floor makes up the majority of the Earth's surface and yet,
its geomorphology is not fully understood. Recent debate has focused on
whether sea level changes --- driven by Milankovitch glacial cycles ---
generate the abyssal hill fabric of the ocean floor by modulating
mid-ocean ridge magma supply. However, periodicities longer than
Milankovitch cycles are prominent in the ocean bathymetry. Using crustal
thickness estimates from two-phase flow simulations of ridge magma
transport, I show that persistent melt-rich porosity waves are
responsible for the ocean floor fabric at periods of 100 kyrs and
longer, except in the case of fast-spreading ridges. For periods longer
than 100 kyrs, spectral energy is notably present at large mantle
permeabilities regardless of spreading rates. Therefore, two-phase flow
models can provide constraints on elusive mantle parameters such as
permeability and viscosity when directly linked to the ocean floor
fabric produced.