Abstract
Blue and fin whales were heavily whaled from the Southern Ocean during the 20th century and their populations today remain at extremely low levels. Both species produce loud, low-frequency calls that are well suited for long propagation. Eight acoustic recording packages (ARPs) were deployed off the Western Antarctic Peninsula, with instrument spacing from 100 to 180 km. Blue and fin whale calls were commonly heard and two different methods were used to determine locations and ranges to the calling whales. Blue whales were localized using the differences in call arrival times to three different instruments. It also was possible to calculate ranges to blue whales from multipath arrivals of their calls and verify the results obtained by the difference in arrival times method. Short detection ranges for fin whales precluded localization, but multipath arrival difference allowed range estimation. Source levels for both species were calculated using these ranges and the measured received levels.
Published Version
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