Sonic weapon

“Sonic and ultrasonic weapons (USW) are weapons of various types that use sound to injure, incapacitate, or kill an opponent. Some sonic weapons are currently in limited use or in research and development by military and police forces. Some of these weapons have been described as sonic bullets, sonic grenades, sonic mines, or sonic cannons. Some make a focused beam of sound or ultrasound; some make an area field of sound.

An NYPD officer stands ready with the LRAD 500X at an Occupy Wall Street protest on November 17, 2011 near the city hall
Extremely high-power sound waves can disrupt or destroy the eardrums of a target and cause severe pain or disorientation. This is usually sufficient to incapacitate a person. Less powerful sound waves can cause humans to experience nausea or discomfort. The use of these frequencies to incapacitate persons has occurred both in anti-citizen special operation and crowd control settings.

The possibility of a device that produces frequency that causes vibration of the eyeballs—and therefore distortion of vision—was suggested by paranormal researcher Vic Tandy in the 1990s while attempting to demystify a “haunting” in his laboratory in Coventry. This “spook” was characterised by a feeling of unease and vague glimpses of a grey apparition. Some detective work implicated a newly installed extractor fan that, Tandy found, was generating infrasound of 18.9 Hz, 0.3 Hz, and 9 Hz.

A long-range acoustic device has been used by the crew of the cruise ship Seabourn Spirit to deter pirates who chased and attacked the ship. More commonly this device and others of similar design have been used to disperse protesters and rioters in crowd control efforts. A similar system is called a “magnetic acoustic device” “The mosquito”. ‘Mobile’ sonic devices have been used in the United Kingdom to deter teenagers from lingering around shops in target areas. The device works by emitting an ultra-high frequency blast (around 19–20 kHz) that teenagers or people under approximately 20 are susceptible to and find uncomfortable. Age-related hearing loss apparently prevents the ultra-high pitch sound from causing a nuisance to those in their late twenties and above, though this is wholly dependent on a young person’s past exposure to high sound pressure levels.

High-amplitude sound of a specific pattern at a frequency close to the sensitivity peak of human hearing (2–3 kHz) is used as a burglar deterrent.

Some police forces have used sound cannons against protesters, for example during the 2009 G20 Pittsburgh summit, the 2014 Ferguson unrest, the 2016 Dakota Access Pipeline protest in North Dakota, among others.

It has been reported that “sonic attacks” may have taken place in Cuba in 2016 and 2017, leading to health problems, including hearing loss, in US and Canadian government employees at the US and Canadian embassies in Havana. Reporting of odd sounds, later to be determined to be crickets were attributed to symptoms suffered by US Embassy employees. Subsequent testing revealed brain lesions consistent with pesticide exposure, which was subsequently attributed to improper ventilation after fumigation of the building.

Research
See also: United States Department of Defense policy on non-lethal weapons
Studies have found that exposure to high intensity ultrasound at frequencies from 700 kHz to 3.6 MHz can cause lung and intestinal damage in mice. Heart rate patterns following vibroacoustic stimulation has resulted in serious negative consequences such as atrial flutter and bradycardia.

Effects other than to the ears
The extra-aural (unrelated to hearing) bioeffects on various internal organs and the central nervous system included auditory shifts, vibrotactile sensitivity change, muscle contraction, cardiovascular function change, central nervous system effects, vestibular (inner ear) effects, and chest wall/lung tissue effects. Researchers found that low frequency sonar exposure could result in significant cavitations, hypothermia, and tissue shearing. No follow up experiments were recommended. Tests performed on mice show the threshold for both lung and liver damage occurs at about 184 dB. Damage increases rapidly as intensity is increased.[citation needed] The American Institute of Ultrasound in Medicine (AIUM) has stated that there have been no proven biological effects associated with an unfocused sound beam with intensities below 100 mW/cm² SPTA or focused sound beams below an intensity level of 1 mW/cm² SPTA.

Noise-induced neurologic disturbances in scuba divers exposed to continuous low frequency tones for durations longer than 15 minutes has involved in some cases the development of immediate and long-term problems affecting brain tissue. The symptoms resembled those of individuals who had suffered minor head injuries. One theory for a causal mechanism is that the prolonged sound exposure resulted in enough mechanical strain to brain tissue to induce an encephalopathy. Divers and aquatic mammals may also suffer lung and sinus injuries from high intensity, low frequency sound. This is due to the ease with which low frequency sound passes from water into a body, but not into any pockets of gas in the body, which reflect the sound due to mismatched acoustic impedance.

Ultrasound weapons are much more effective underwater than through air.”

Source: https://en.wikipedia.org/wiki/Sonic_weapon

Reference: https://usatoday30.usatoday.com/tech/news/techinnovations/2005-11-07-cruise-blast_x.htm

“Cruise ship attacked by pirates used sonic weapon
By John Pain, Associated Press
MIAMI — The crew of a luxury cruise ship used a sonic weapon that blasts earsplitting noise in a directed beam while being attacked by a gang of pirates off Africa this weekend, the cruise line said Monday.” “Posted 11/7/2005 10:13 PM”

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