Mid frequency military sonar has proven one of the most troubling acoustical assaults on marine life, particularly associated with catastrophic strandings of marine mammals. The most common victims have been odontocetes – toothed whales and dolphins, but Minke whales have also washed up on the shore after the use of these sonars.
“Mid Frequency” is considered between 1 kHz and 10 kHz – within the human auditory band. When noises have been correlated to events they have been ranging sonars – extremely loud chirps and tones used for navigation and surveillance. But increasingly more complicated signals are being deployed that may have varying impacts on various animals.