This e-mail is being distributed to inform interested parties of a simple analysis that I did which demonstrates that the Navy is misleading the public (probably intentionally) about the underwater sound level of Low Frequency Active Sonar (LFAS).
It would have been nice if I could have done this while the Hawaii tests were still underway but hopefully now is still better late than never.
My analysis is based on a statement made by the Navy in one or more of their reports on LFAS which was often quoted by National Marine Fisheries Service to help justify their support of the LFAS test program in Hawaii. A similar statement can presently be found under Debunking the Myths on the Navy LFAS web site at
The important part of the statement is: The acoustic power of a jet at take off (180 dB air) will generate about 100 kilowatts. The acoustic power of the LFA speaker (200 dB water) would generate about 1 kilowatt or the equivalent of 1% of the sound level of a jet engine. In other words, a jet engine is 100 times louder than a 200 decibel sound in water.
I was suspicious of the accuracy of this statement when I first saw it. Recently I was able to follow through some simple mathematics from which it was clear that the LFA speaker underwater was, in fact, louder than the hypothetical jet engine. The details of the analysis are given on my almost identical websites at:
The analysis was based on the basic physics of the behavior of sound waves in air and water. It is hard to believe that the Navy project scientists were unaware of these facts. Hence it seems that the Navys statement was deliberately misleading.
Feel free to copy any or all of the analysis and use it on other websites.
Note from the webmaster:
spiritual-endeavors.org will continue to gently remind all: in any situation, fear clouds good judgement and tends to block our inner sources of information and intuition. We are indeed in a time of change, but it need not be a time of fear.