Abstract
The Cascadia Initiative placed a large number of ocean-bottom seismic sensors off the coast of the US Pacific Northwest. These sensors recorded pulsed sounds from fin whales, recorded in conditions that in many cases make it impossible to resolve the sounds from individual whales. The sounds from multiple whales, however, combine to make a distinct rise in spectral energy in the 15–30 Hz band. This received energy can be used to estimate the population density of fin whales in the vicinity of each sensor over the 4-year duration of the project. Difficulties addressed include the variable rate and intensity of fin whale vocalizations, acoustic properties of the seafloor, and differences between seismic and acoustic sensors. [Funding from ONR.]
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