INTERNATIONAL APPROACHES TO INFRASOUND MONITORING AND MAPPING

Today the acoustical noise pollution, especially in the medium high frequencies, is well modeled and monitored, especially in open space and in the urban environment. Also its auditory and extra-auditory effects are known. On the contrary the infrasonic region of the spectrum is still under investigation. The first study on the presence of the infrasound in air is going back to the end of the 19th century and its effects on the human beings are still investigated. Infrasonic wave has the property to have low attenuation while propagate in the atmosphere and this physical characteristic has been exploited to geo locate natural and man-made sources. This paper is a comparison of two methodologies used to report information on infrasound able to evaluate risks on human beings.