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The Hum is a generic name for a series of phenomena involving a persistent and invasive low-frequency humming noise not audible to all people. A Hum on the Big Island of Hawaii, typically related to volcanic action, is heard in locations dozens of miles apart.
An article by Greg Long for Northwest Mysteries reports on strange sounds seemingly coming from underground in the south-central region of the state of Washington. On January 10, 1999, dozens of people in Fairfield, Ohio reported a stunning, explosive sound. Thousands of homes were rattled by two huge, mysterious booms 30 miles southeast of Los Angeles just before 10 p.m. On December 17, 1997, a huge aerial blast rattled windows and blew open storm doors in Rogersville, Mo., a town 13 miles east of Springfield.
The Bloop sound was placed as occurring several times off the southern coast of South America and was audible 5,000 kilometers away. Some people can shut them out, while others, with more acute hearing, can condition themselves to listen to the noise, creating stress and physical problems. Those who have heard the mysterious machine-like sounds, including loggers, liken the noise to "several large turbines" starting up and running, or a "loaded truck pulling up a long hill and never reaching the top." The article also examines similar noises reported in England, Italy, Colorado, Texas, Puerto Rico, New Jersey, California, and other states.

16, 1997, the campus of the University of North Carolina at Chapel Hill was rocked by a boom that shook the ground and registered 1.1 on the Richter scale.
Pictured above is a visual representation of a loud and unusual sound, dubbed a Bloop, captured by deep sea microphones in 1997.
Although the sound has similarities to those vocalized by living organisms, not even a blue whale is large enough to croon this loud. Among these accounts are what sounded like underground drilling and construction work, motor-like sounds, or generators. Readings from ground-monitoring equipment showed that the energy did not come from the air, ruling out a sonic boom.
In the above graph, time is shown on the horizontal axis, deep pitch is shown on the vertical axis, and brightness designates loudness. The sounds point to the intriguing hypothesis that even larger life forms lurk in the unexplored darkness of Earth's deep oceans.
A well-known case was reported in Taos, New Mexico, and thus the Hum is sometimes called the Taos Hum. Typically the Hum is difficult to detect with microphones, and its source and nature are hard to localize.

Although Bloops are some of the loudest sounds of any type ever recorded in Earth's oceans, their origin remains unknown. A less imagination-inspiring possibility, however, is that the sounds resulted from some sort of iceberg calving. Long wonders if the noises can be attributed to seismic activity and speculates on the correlation with sightings of UFOs sometimes reported in the same areas.
Although it could have been a sonic boom, the military denied any military activity in the area. No further Bloops have been heard since 1997, although other loud and unexplained sounds have been recorded.

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