The document discusses four important metrics for ranking journals: Source Normalized Impact per Paper (SNIP), SCImago Journal Rank (SJR), Impact Factor, and 5-Year Impact Factor. It then provides the rankings for five maritime journals according to those four metrics for 2016. The journals discussed are Ocean Engineering, Journal of Hydrodynamics, Journal of Marine Structures, Journal of Thin-Walled Structures, and Journal of Sound and Vibration. Lastly, it lists five keywords for the topic of marine propeller vibration.