Description
To learn more about this topic, start your googling with these keywords:
Infrasound: sound waves too low in frequency for humans to hear. The CTBTO stations detect frequencies of 0.02 to 4Hz
Hydroacoustic: having to do with underwater sounds. The CTBTO stations detect frequencies of 1-100 Hz
Seismic: oscillation waves in the earth, often caused by earthquakes or other tectonic activity. The CTBTO stations detect frequencies of 0.02-16 Hz
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