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  • Whale researcher says Navy's new sonar can kill
    letter uses mathematical equations to describe the relationship between the size of air spaces and the resulting resonance He also questions whether the Navy has proposed adequate precautions with its new low frequency sonar which he says can create resonance frequencies The Navy has consistently tried to de link the low frequency active sonar with the normal sonar he said If you really investigate resonance you will see there is a common denominator Joe Johnson who leads a team studying the environmental impacts of low frequency sonar said laboratory studies were done to measure resonance effects on rats mice and guinea pigs It takes a fairly steady tone to create resonance he said Frequency change and sound levels used in the low frequency sonar system are not great enough to cause injury in whales although they may cause behavioral changes Based on everything we ve seen he said this is not going to have an impact on the species If in doubt Johnson said consider that the large whales blue whales and humpback whales generate the same volumes and frequencies as the Navy s low frequency sonar Balcomb a former Navy man himself said he is disappointed that the Navy has not provided adequate answers to the Bahamas incident We are not talking theory stuff here Balcomb said in an interview The Navy can throw up all kinds of theoretical reasons why it didn t happen But it happened There has to be something wrong with the theory I m trying to get them to look at the resonance issue The Navy s new system towed by a ship uses a series of speakers to produce low frequency sounds that can travel hundreds of miles Reflected waves are used to locate other ships The system would not be deployed close to shore the Navy says and operational procedures reduce the chance of a whale being nearby during transmission IF YOU WANT TO DO SOMETHING ABOUT THIS PROBLEM HERE IS WHAT YOU CAN DO CONTACT MARK PALMER BELOW TO ASK RECEIVING THE NECESSARY INFO TO GET INVOLVED IN PROTESTING THE PROPOSED PERMIT From Mark Palmer mpalmer mother com Subject LFA MMPA Permit in Federal Register Next Week STOP THE NAVY NOISE International Marine Mammal Project Earth Island Institute Dear LFA Activists We understand that the National Marine Fisheries Service NMFS will likely be publishing their proposed permit for the Navy to incidentally take marine mammals during operation of the LFA Sonar system The permit will be published in the Federal Register towards the end of next week if all goes according to plan A permit is required under the provisions of the Marine Mammal Protection Act and the Endangered Species Act There will be a 45 day comment period for the public Natural Resources Defense Council is planning to provide background information and examples of comments for the public so I expect to pass along that information on this list as soon as it is available If as expected the NMFS

    Original URL path: http://www.lfas.net/sonarkillswhales.htm (2016-05-01)
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  • 20,000 Decibels Under the Sea
    scientists and politicians say the Navy doesn t have enough proof We believe the research program on LFAS conducted by the Navy has been inadequate states a letter signed by 26 members of the U S House of Representatives to Secretary of Defense William Cohen Because sound produced by the LFAS system is designed to travel over vast distances and because the sound produced by the system is so powerful there is a growing scientific concern that the use of LFAS will interfere with the natural behavior of many marine species especially marine mammals In 1999 the Navy released a study of the effects of LFAS exposure on whales off the coasts of California and the Hawaiian Islands Independent scientists working in conjunction with the Navy found the sound blasts did have an impact Vocalizations of fin and blue whales decreased gray whales deviated from their migration paths the louder the sound the greater the deviation and about one third of the humpback whales stopped singing The Navy s conclusion that these changes have no lasting biological significance raised the ire of critics These experiments only tested immediate observable changes in behavior to an exposure level of around 150 decibels a sound well below the 240 decibel level at which the technology will be deployed writes marine researcher Leigh Calvez in The Ecologist June 2000 Indeed it s what the report doesn t say that opponents find so compelling During the tests off Hawaii notes Earth Island Journal members of the Hawai i Ocean Mammal Institute found two abandoned whale calves and a baby dolphin in the test area We have never heard of anyone observing an abandoned calf in our nine years of research off the Hawaiian Islands OMI s Marsha Green told Earth Island Journal The sonar tests

    Original URL path: http://www.lfas.net/20000decibels.htm (2016-05-01)
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