Infrasound from distant artificial sources has been detected at 2 Hz by a chain of stations in Sweden. A number of infrasound sources were located and identified as hydroelectric power plants, industrial plants, and oil fields. The infrasound from distant artificial sources propagates with reflections in the upper atmosphere: during summer mainly with reflections in the stratospheric sound channel and during winter with reflections in the upper sound channel.
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Ludwik Liszka (1974) studied this question.
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