INFRASOUND: way back in late 70s early 80s New Scientist published articles on Infrasound and how it can be directed and cause materials to turn to dust/jelly - can't remember exact details. Sticks in my memory because would-be novelist in family used the idea in a book about a bank-heist that he wrote (never published). A quick search comes up with the following article from New Scientist but the ones I'm talking about were earlier. Then it went very quiet - like further research on Infrasound was classified. I think this article is disinfo and that Infrasound has been weaponised.
https://www.newscientist.com/article/mg16121783-300-not-a-sound-idea/
Not a sound idea
By Jeff Hecht
ATTEMPTS to build weapons that incapacitate people by harnessing the power of
very low-frequency sound waves are destined to fail, says a German
physicist.
Some weapons developers have claimed that infrasound, frequencies too low to
hear, can cause debilitating effects such as nausea and diarrhoea. But
Jürgen Altmann of Ruhr-University Bochum has studied the scientific
literature and is convinced that the weapons will never work. He presented his
findings this week to a joint meeting of European and American acoustical
societies in Berlin. “All these effects of infrasound do not really exist,” he
says.
William Arkin, a writer and consultant based in South Pomfret, Vermont, has
obtained documents describing infrasound research that came from the Pentagon
under the Freedom of Information Act. The papers claim high-power infrasound
could leave troops “incapacitated by nausea”.
Police also believe infrasound weapons would have advantages over chemicals
such as tear gas. “It is environmentally benign, can be switched on and off, and
can be controlled much better,” says Sid Heal of the Los Angeles County
Sheriff’s department.
The idea that low-frequency vibrations make you ill may have started because
some people feel queasy during earthquakes. Nikola Tesla, the inventor of
transformers and generators, reportedly duplicated the effect with a vibrating
chair almost a century ago.
But those observations were based on mechanical vibrations in solids, which
couple energy to the human body much more efficiently than sound waves can
transfer energy from the air. Altmann says that experiments in which people or
animals have been subjected to airborne infrasound suggest the weapons won’t
work.
“I found no hard evidence for vomiting or uncontrolled defecation, even at
levels of 170 decibels or more,” Altmann says. And while air transmits
infrasound very well, he points out that the wavelengths are so long—17
metres or more—that it spreads out too rapidly to form a controllable
beam.
Altmann blames rumour and misunderstanding for the stories surrounding
infrasound. “You can’t hear it, so you’re inclined to believe what people say
about it,” he says.
Heal, who works with the US Army on its infrasound weapons programme, admits
that the research has been refocused. As well as attempting to create prototype
weapons, researchers are trying to develop a better understanding of how
infrasound might affect the human body, he says.