Why do you feel dizzy during an earthquake?

Infrasound waves are generated during earthquakes. Infrasound will interfere with the normal function of human nervous system and endanger human health. A certain intensity of infrasound can make people dizzy, sick, vomiting, out of balance and even depressed. Some people think that motion sickness and seasickness are caused by infrasound waves accompanied by cars and ships.

People who live in buildings with more than ten floors often feel dizzy and nauseous in windy weather, which is also because strong winds make high-rise buildings shake and produce infrasound waves. Stronger infrasound waves can also make people deaf, unconscious, insane and even die.

Infrasound waves are characterized by wide sources and far propagation, which can bypass obstacles and spread far. The sound frequency of infrasound is very low, below 20Hz, but the wavelength is very long and the propagation distance is very long. It travels farther than ordinary sound waves, light waves and radio waves. For example, infrasound with a frequency lower than 1Hz can spread thousands or even tens of thousands of kilometers away.

Infrasound waves have strong penetrating power, which can not only penetrate the atmosphere, seawater and soil, but also penetrate solid reinforced concrete buildings, even tanks, warships, submarines and airplanes.

Infrasound waves travel at the same speed as audible sound waves because of their low frequency. The atmospheric absorption of infrasound is very small. Infrasound travels a few Qian Qian meters, but it is absorbed less than a few ten thousandths, so it travels a long distance, ranging from several kilometers to hundreds of thousands of kilometers.

Extended data:

In nature, ocean storms, volcanic eruptions, large meteorite landings, tsunamis, lightning, waves hitting the coast, eddies in water, air turbulence, tornadoes, magnetic storms, auroras and earthquakes may all be accompanied by infrasound waves.

In human activities, such as nuclear explosion, missile flight, artillery shooting, ship navigation, racing cars, shaking of high-rise bridges, and even blowers, mixers, loudspeakers and so on. At the same time, it can produce infrasound.

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