Offshore wind is an expanding source of renewable energy, with new wind farms currently de-veloped in seismically active zones. The presence of loose, liquefiable sands raises concerns regarding the behaviour of the scour protection rock for foundation of offshore structures during an earthquake, namely the large settlement of the rock berm (Xu et al., 2022), but there is little understanding of best practice in the design. This paper presents the results of two dynamic centrifuge tests that explore the effect of rock density on berm settlement due to earthquake induced liquefaction of the seabed. The collected data capture rock settlement, soil accelerations and pore pressures within the models. The results show that significant settlements occur for all scour protection rock types, but higher density rock is susceptible to larger settlements. The results form part of a wider project researching the behaviour of rock scour protection in liquefiable soils.