There are many sources of infrasound, which can be divided into natural sources and man-made sources. The natural sources of infrasound include storms, lightning, earthquakes and tsunamis, volcanic eruptions, meteorite falls, aurora discharges and solar magnetic explosions. The man-made sources of infrasound include airplane flight, high-speed driving of vehicles, rapid operation of machines, rocket launch and nuclear explosion.
Infrasound penetration is particularly strong, and the usual sound insulation and absorption equipment has little influence on it. It can penetrate solid buildings, and even astronauts' helmets can't completely isolate infrasound waves. Infrasound is very harmful to human health. Once high-intensity infrasound acts on human body, it will cause dizziness, tinnitus, nausea, insomnia, insanity, numbness of limbs, unconsciousness and other symptoms. Extremely strong infrasound can also kill people.
1948 In February, a Dutch cargo ship was sailing westward in the Pacific Ocean, and all the crew were in a good mood because their ocean voyage was very smooth and their business was very successful. I'm so happy to think that they will see their long-lost relatives soon!
At this time, the captain informed everyone that the front is about to enter the Indian Ocean, but it must cross the Straits of Malacca. Please get ready for the crew. Hearing this, the crew immediately became nervous and the laughter stopped. Sailors all know that storms often occur in the Straits of Malacca.
Unfortunately, they were caught in a storm. The ship was disoriented by the strong wind and kept shaking violently. The crew's ears are the roar of sea breeze and waves. Everyone feels headache, tinnitus, nausea, heart pounding, and then the limbs are numb and the brain loses consciousness.
A few days later, a military plane flew over the Straits of Malacca and found the destroyed merchant ship. Rescuers came to the ship and saw that the ship was full of bodies, which was terrible.
Scientists' investigation and study of this disaster confirmed that infrasound caused by sea breeze and waves "killed" the crew in a short time.
The phenomenon of infrasound "killing" people also occurred in France. 1986 April 16, a French infrasound research institute, due to dereliction of duty, caused some infrasound waves to "escape", resulting in more than 30 people "killed" in the suburbs of Marseille more than ten kilometers away.
The harm of infrasound has to arouse people's high vigilance.