Fin whale patterns included persistent acoustic presence for 5–7 months starting by October and ending before April with a CI maximum between October and December. Most sites shared similar patterns in blue whale CI: persistent acoustic presence for 4–5 months starting by August and ending by February with a CI maximum in October or November. Diel and seasonal patterns were then determined in the context of their migratory patterns. A call index (CI) was used to quantify the intensity of blue whale B calls and fin whale 20 Hz pulses. physalus, sound production in the eastern North Pacific Ocean, this study explored data recorded between 20 from four NRS recording sites. To understand seasonal patterns of blue whale, Balaenoptera musculus, and fin whale, B. To date, NRS datasets have been analyzed to understand spatial variation of large-scale sound levels, however, assessment of specific sound sources is an area where these datasets can provide additional insights. Data collection began in 2014 and spans 12 acoustic recording locations. The NOAA-NPS Ocean Noise Reference Station Network (NRS) is a passive acoustic monitoring effort to record the low-frequency (<2 kHz) sound field throughout the U.S. 9National Centers for Environmental Information, National Oceanic and Atmospheric Administration (NOAA), Boulder, CO, United States.8Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States. 7Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration (NOAA), Newport, OR, United States.6Office of Science and Technology, National Oceanic and Atmospheric Administration (NOAA) Fisheries, Silver Spring, MD, United States.5Cooperative Institute for Marine Ecosystems and Resources Studies, Oregon State University, Newport, OR, United States.4Department of Fisheries, Wildlife, and Conservation Sciences, Oregon State University, Corvallis, OR, United States.3Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States.2Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, United States.1Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO, United States.
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