This persistent hum shows how much we still don’t understand about low-frequency hearing, useful context for a colleague or friend following unexplained phenomena.
The Unexplained Global Hum Story flow and key facts
The 'global hum' is a mysterious, low-frequency droning noise reported by thousands of people across the world, from Bristol, England to Taos, New Mexico. First noticed in the 1970s, the phenomenon gained attention when residents in various towns began describing a persistent sound similar to a distant idling engine. Despite investigations by teams from Sandia National Laboratories, the University of New Mexico, and other institutions, no consistent external source has been found. In 2012, the Worldwide Hum Project was launched to map reports and study patterns. Recent research from the Norwegian University of Science and Technology suggests that many cases may stem from subjective low-frequency tinnitus—a condition where the brain perceives sound without an external source. However, some theories propose environmental causes like microseismic waves, gas pipelines, or electromagnetic frequencies. The experience remains deeply personal and often distressing, with no universal solution yet.
Facts
- The 'global hum' was first reported in Bristol, England in the 1970s.
- In 1993, residents of Taos, New Mexico reported a similar hum, prompting a scientific investigation by Los Alamos and Sandia National Laboratories.
- A 2026 study by NTNU found no evidence that hearers detect lower frequencies better, but suggested low-frequency tinnitus as a likely cause.
- The Worldwide Hum Project launched in 2012 to collect global reports of the phenomenon.
- Scientists have proposed environmental sources like microseismic waves and gas pipelines, but no single explanation fits all cases.
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