Mass whale deaths tied to U.S. Navy sonar

EXCERPT - The U.S. Navy's deployment of active sonar to detect submarine activity is believed to have been responsible for at least six incidents of mass death and unusual behavior among pods of whales in the last 10 years, according to a recent U.S. Congressional Research Service report.

In one of the most serious incidents, 150 to 200 melon-headed whales were observed milling in Hanalei Bay off Hawaii's Kauai Island during a Rim of the Pacific Exercise on July 3, 2004, after midfrequency sonar was used, the CRS report said.

Known as RIMPAC, the naval exercise included the participation of Japan and other U.S. allies in Asia and the Pacific.

The CRS report also listed five other incidents in which smaller whales, such as goose-beaked whales, harbor porpoises and killer whales, were found beached and dead in groups of a few to nearly 20. Many of the dead mammals had damaged hearing organs, and all five incidents coincided with U.S. naval exercises in the areas, the report said.

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FURTHER READING:
Sonar threat to whales by Steve Conner
Government Withholds Info on How Sonar Affects Whales by Brendan Coyne