Low-frequency sound, often referred to as infrasound, represents a fascinating aspect of acoustics that lies beyond the range of human hearing. Despite its imperceptibility to our ears, low-frequency sound waves can have profound effects on both the natural environment and human activities. In this article, we delve into the world of low-frequency sound, examining its characteristics, applications, and the challenges associated with its study.

Low-frequency sound waves have frequencies below the threshold of human hearing, typically below 20 Hz. While we cannot consciously perceive these sounds, they can still be detected by sensitive instruments and can travel vast distances with minimal attenuation. Infrasound is produced by a variety of natural phenomena, including earthquakes, volcanic eruptions, ocean waves, and weather patterns, as well as by human activities such as industrial machinery, transportation, and wind turbines.
Low-frequency sound can have significant impacts on the natural world. For example, marine mammals such as whales and dolphins use infrasound for communication and navigation over long distances. Anthropogenic sources of low-frequency noise, such as shipping, sonar, and offshore energy exploration, can disrupt these vital behaviors, leading to stress, disorientation, and even strandings. In terrestrial environments, infrasound from activities such as mining, construction, and military operations can disturb wildlife, alter ecosystem dynamics, and contribute to habitat degradation.