Fig. 6: Monthly vessel counts within the Olympic Coast National Marine Sanctuary.
From: North Pacific Ocean sound levels 2018–2022: COVID-19 pandemic impacts on anthropogenic noise
Counts of ships derived from the Automated Identification System44 for all ships within a 222 × 222 km square area centered on the hydrophone mooring location at the Olympic Coast National Marine Sanctuary during 2019–2023 (Table 3). Diagrams show clear seasonal patterns with peak ship activity occurring during May–October.
