Earth's hum is caused by coastal waves

Earth's hum arises from the sea floor, and not during the turbulence in the atmosphere, says U.S. researcher, supports a new theory, which arose in 2004.

Hum — low by its sound and continuous rumble present in the soil, even without earthquakes, but detectable with highly sensitive seismometers. Its frequency is about 10 millihertz below that range, perceived by the human ear.

Earlier in 1998, Japanese researchers have suggested that this noise could be caused by a "clash" of turbulent flows to the ground.

Six years ago, a group of researchers led by Barbara R. University of California, Berkeley (USA), said that the drone was actually called a "clash" of the waves, not air flow. The theory was based on the research of several groups of seismometers deployed in the areas where the noise was heard. It seemed that the sound was something to do with the large ocean storms along certain coastlines, however, the California group could not be defined as the waves create a similar effect.

The following 2005, Goran Ekstrom of Columbia University (USA) showed that the amplitude hum correlated with the average value of the wave energy along coastlines around the world. Currently colleague Goran Ekstroma — Spehr Webb argues that it can show how waves generate buzz.


Webb used an old work on the ocean waves to predict a background noise waves, appearing above the shallow ocean. He found that the results of its forecast range of earth rumble match.

According to him, the hum caused by a combination of the two waves of the same frequency, but in the opposite direction. Alternating waves then quenched, then reinforce each other because of what the sea surface is corrugated flat, then it goes back wavy. The result is a constant wave.

Waves traveling along the shallow continental shelf is much more than in the deep and in this way they communicate to the strength of the constant wave of big names in the shallows. This, according to Webb, it correlates well with the observations of R., who has studied all the areas in the Pacific Ocean has found that the hum of the Earth coincides with the best waves along the coast line of Vancouver (Canada), where the shallow shelf and ocean waves can be enormous.

Webb adds that the results of its forecast indicate the existence of buzz on Mars, like Earth, but on Mars, and no oceans. However, Martian roar could be different due to the Martian earthquakes.

Translation: Anna Krasnov


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