In April 1998, the Journal of the Society for Psychical Research published a paper called ‘The Ghost in the Machine’ by Coventry University lecturer Vic Tandy. It described Tandy’s experiences with infrasound while working in a medical lab.
His coworkers complained of spooky feelings and chills in his lab. A cleaning lady resigned after “seeing something.” Working alone in the lab one night, Tandy suddenly had the feeling he was being watched. He claimed shadowy figure appeared at the edge of his vision. When Tandy turned to face it, the figure vanished.
The next day, Tandy brought a fencing foil to the lab for repairs. When he clamped one end of the blade in a vise, it started vibrating wildly. Curious, Tandy began moving the blade around the room. It vibrated strongly in the center of his lab, but completely stopped at the edges of the room.
Tandy discovered a 19Hz standing wave in his laboratory. The walls of the lab had caused the sound wave to double back on itself, producing an area of maximum energy in the center of the room- enough energy to vibrate his sword.
The source of this wave was a newly installed fan at one end of the lab. When it was turned off, the wave, and all phenomena associated with it, disappeared.
This interesting article brings to light a concept that's been held for some time, that infrasound could be an explanation for ghostly activities.
Infrasound is sound in a frequency so low, humans cannot hear it, but they can feel it in their body. Some of the lower but audible levels include those damned subwoofers in cars that create that low bass sound that feels like it pounds in our chests when a young future-deaf teenager drives by.
This is interesting territory. You hear something similar with explanations for alien abductions being sleep paralysis, and yet there are many abducted supposedly from walks in the woods and driving their car down the road. I'm not saying I necessarily believe in abductions, but I do believe that paralysis does not explain them all.
It's entirely possible that infrasound could create a set of sensations that are similar to a haunting. You ever walk into a building and it just has a bad feel? It could be any number of things; high EMF, infrasound, visual and sensory cues such as musty smell and darkness, strange shaped rooms, unusual pieces such as a knight's armor, and any number of other factors that make it "off." As well, factors such as geology/geomagnetic storms/earth energy paths could all be enhancing to something that already exists there.
In a future book about spirit vessels, Julie and I hope to explore what commonalities haunted locations have in order for that site to be one where a person can experience the paranormal. Infrasound could be one aspect of it, but what is causing the infrasound could be mechanical like the story above or perhaps even earth-based such as underground tunnels and rich geology like in the town of Tombstone.
This is yet another avenue to check out.