Let’s recall that many readers are fairly new to this. So let’s summarize and bring them up to speed.
I don’t think any serious scholar of the Worldwide Hum claims that the clear answer has been found. I think there is a consensus developing that there may two or more independent factors that can cause people to hear/perceive low frequency sounds that have certain characteristics. Those properties are discussed at length elsewhere in this blog.
I identified four hypotheses that pass the most trivial examination. Each has difficulties. One or more of these may only be prerequisite factors, activated by some other condition or conditions.
- VLF Radio (3 kHz- 30 kHz) is the culprit. When I entered the VLF-Radio Blocking unit, which out of respect for the author of the concept I named the Deming Box, the Hum was loud and clear. Once my physics of skin depth are confirmed, and once a VLF meter proves the box does what I say it does, then this theory can be discarded if my result are replicated. Note that ELF radio (f < 3 kHz) must be ruled out as well.
- The Hum is the result of massive and widespread human activity that creates colossal levels of low frequency sound and infrasound. Busy freeways, for example, can generate sounds and vibrations that can travels for many miles, even further over water. Europe was the first place on Earth to have high density, high speed traffic through high densities of human population. The Hum started there, if the currently accepted history is correct. Soviet research noted that the sounds of surface mining can travel more than 10 km horizontally and at least three km deep. All manner of human activity generates these sounds, and there is the possibility that we have reached some type of acoustic critical mass of sound energy in some regions that can be detected by a subset of the population.
- Recent historical research and newspaper analysis (a fancy term for me reading on the internet) finds that there are reports from 19th century England of early seismologists hearing from witnesses who reported acoustic precursors as well as concomitant sounds associated with earthquakes and seismic activity. The Hum may be connected to such a geological or terrestrial process. There is a subset of the population which is profoundly more sensitive to low frequency sounds and infrasound. Members of many animal species have this sensitivity, and they act as a warning alarm for earthquakes.
- The Hum is internally generated, as are tinnitus and otoacoustic emissions. If acoustic and electromagnetic prerequisites can be ruled out, and if I find convincing historical evidence for the Worldwide Hum, then I think this becomes a very solid theory. As to why only a small proportion of the population can hear the Hum, these hearers may share an anatomical variation in the auditory system, for example. There is also the possibility that the Hum is indeed a relatively recent phenomenon but results from anthropogenic environmental factors, medication, and so on.
Because the World Hum Map and Database project works on a tiny budget, I can’t conduct the simple experiments that I’ve suggested on this blog. They can be conducted by amateurs who have the resources and motivation to do so. A serious university or private lab could unlock all this in a few months, but for years now we have moved along, inch by inch. Apart from some very rudimentary experimental results, one thing we have accomplished is widespread, mainstream media exposure and some degree of normalization.