an infrasound of a frequency of 0.2 Hz is a periodic fluctuation of sound pressure with a cycle of 5 seconds.
After erupting, one volcano sings a unique ‘song’
https://www.snexplores.org/article/after-erupting-one-volcano-sings-unique-song
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an infrasound of a frequency of 0.2 Hz is a periodic fluctuation of sound pressure with a cycle of 5 seconds.