Infrasound can result from both natural and man-made sources : Some animals have been thought to perceive the infrasonic waves going through the earth , caused by natural disasters , and to use these as an early warning . An example of this is the 2004 Indian Ocean earthquake and tsunami . Animals were reported to have fled the area hours before the actual tsunami hit the shores of Asia . It is not known for sure that this is the cause ; some have suggested that it may have been the influence of electromagnetic waves , and not of infrasonic waves , that prompted these animals to flee
2004 Indian Ocean earthquake and tsunami
2004 Indian Ocean earthquake and tsunami
Infrasound