天皇海山群
Since 65 Ma the RTJ has been migrating north-east at a decreasing rate: originally the velocity was 10 cm/yr, at 43 Ma 2.6 cm/yr, and since 41 Ma around 3.6–3.8 cm/yr. The stability in migration rate around 41 Ma coincides with the bend in the Hawaiian–Emperor seamount chain — hinting at a global reorganisation of tectonic plates at this time.