Verso Un Ambiente Marino Silenzioso: Il Ruolo Degli Osservatori Acustici Passivi towards a Silent Marine Environment: the Role of Passive Acoustic Observatories

The sound is widely used in marine observatories as an alternative means to retrieve information about environmental data in the sea area under surveillance. The original idea of using specifically man-made sound sources to send signals in the marine environment triggered the idea of ocean acoustic tomography and many alternative methods have been developed to exploit the acoustic measurements towards the retrieval of the environmental data. It is however desirable to reduce the noise originated from not natural sources in the marine environment to obtain a more silent marine environment. Thus the idea of using measurements of signals due to acoustic sources of opportunity or even the ambient noise for inversion purposes is continuously gaining the attention of the scientists. Parole chiave: Ambiente marino; Osservatori acustici passivi.