Infrasonic sounds are sound waves with frequencies lower than 20 Hz, which is below the range of human hearing.

With the growth of fire hazards there is impetus to develop new technologies to remotely monitor and quantify wildfires.

They were interested to find out whether elephants would react to very low frequency (infrasonic) sounds from a distant thunderstorm. The pressure from the low frequency sound inside the Kombi ...

much of the sound energy is concentrated in the low frequency region (see INFRASONIC). Since the A weighting network corresponds to the tendency of the ear to discriminate against low frequency sounds ...

For awhile now researchers have thought that infrasonic sound could be the thing to explain the “feelings” of danger or fear ...