Home » hum research » What is Causing the Hum? The Four Hypotheses.

What is Causing the Hum? The Four Hypotheses.

Follow World Hum Map and Database Project on WordPress.com
Follow World Hum Map and Database Project on WordPress.com


  1. J.O. says:

    I just listened to the new video from Dr. MacPherson. From my experience, hypothesis #2 is out, because I cannot hear the hum in warmer months of the year. But I perceive it extremely well in the winter (and I realize my case is a bit different in this aspect). An internally generated sound like tinnitus, would not respond this way…I think.
    Last week a military jet made a landing at our local airport. When it took off, the rumble it created also manifested as a strong vibration. As many of us also “feel” the hum as a vibration, I got to wondering if the increased number of airplanes in the sky at all hours of the day and night may be the cause of the hum? Think about the droning rumble that a 747 makes when it passes overhead, then imagine the sound from 1000’s of them with the sound waves bouncing off the atmosphere and returning to earth as a combined, low frequency, droning sound. Many of us describe the hum as an “engine type sound and jet aircraft do indeed have a type of engine. Just thinking…

    “Global air traffic has increased 8 fold over the last 4 decades” (from: http://www.bitsofscience.org/graph-global-air-travel-increase-6848/ )

    • J.O. –

      It has been very plausibly suggested that the reason many hearers (myself included) “hear” the Hum significantly better in cold weather than in warm is because we tend the open windows in warm weather letting in environmental sound that masks (distracts from) the Hum. Aren’t you typical in this regard? Remember that sound levels are perceived logarithmically (in db).

      Further, you said “with the sound waves bouncing off the atmosphere and returning to earth.” Please expand on your contention. A few sound waves may be broadly bent back to earth (usually well below the levels planes fly) in certain instances, for a few minutes, but not generally. Most sound going up just goes up. There is no “top” of the atmosphere – it just peters out.


      • J.O. says:

        Bernie, I’ve hear the hum each winter since 2016. It starts in Dec. and begins driving me nuts by Feb. where I can hear it 24/7 and even over background noise like the TV. I live in Colorado so nights don’t get warm enough to open the windows until late April early May. We had a very warm week for daytime highs in April and the hum got very faint. The next week was cooler and the hum was more pronounced and then pretty much gone by May. I’ve heard it only very slightly recently and have to focus on it to hear it.

        With the sound waves bouncing off the atmosphere comment, i was just hypothesizing and have no supportive evidence. I tossed that out there because when the hum is very strong, I believe i also “feel” it as a vibration and that jet taking off produced a vibration I could also feel.I was just trying to suggest a possible correlation as we have more and more planes in the skies at all times.
        Thanks for the question though, it’s valid I think and I have no expertise in sound waves or atmospheric science.

  2. GS Handley says:

    It’s not #2. It’s external. It’s not #3 , no cumulative effect could “sum” in this way, ridiculous. It’s not #4, it’s two precise consistent frequencies. It’s the cell towers, or other 5G, military or alien related forces, perhaps intentional.
    It’s 146hz and 73 hz, period, which are a Perfect octave apart. It does go off for small periods of time, so It’s not quite 24/7. This also shows that it’s NOT 2, 3 or 4. To assume there’s not advanced technology being used in some secret way, is more than foolish. Do you think the deep state is going to tell you about it? If this is going to be understood, anyone serious is going to have to look where they “shouldn’t”, and may be stopped in the process, which will be quite telling. The Orwellian world is here and now.

    • I think the only thing you’ve written that I agree with is that 146 is a multiple of 73. As for the rest, I think there’s pretty powerful evidence that EM transmissions are not responsible. But, of course, if you have any solid evidence to offer, by all means post it here.

      • GS Handley says:

        I still find it stunningly unscientific to continue to NOT get specific about what hearers hear. I made that effort, and it’s being ridiculed,

        German researcher Harald Kautz-Vella has a few possible explanations, look up his lectures.

      • I’m not sure what you mean. What kind of specificity are you referring to? Are you familiar with the many posts on this topic found on this blog?

      • J.O. says:

        I can’t see where you’ve been ridiculed, but your statements do come off with lots of anger and are sort of accusatory. Hey, we’re just good peeps here trying to understand this phenomena. Dig?

  3. Martin Hunt says:

    I respect the effort that went into building the World Hum Map, however, I’ve traveled extensively, and the hum is the same whether in central China, the Americas, Europe, or anywhere else. For hummers who travel, have you ever found a quiet place with no hum? I believe it simply has nothing to do with location – not the hum I hear. I’d be interested to know one thing: has a hummer ever gone into space? If so – and if they hear it – we can exclude all potential terrestrial sources for the hum.

    • J.O. says:

      It would be easier to go to the quiet room in Minneapolis. Potential astronauts admitting to hearing the hum would probably be scrubbed from the list.

    • I concluded several years ago that location does not matter (this is a fiercely debated point, however). I think the most convincing evidence for this is to overlay a population density map on top of the Hum Map, and you’ll see the striking correspondence between the two.

      • Brian Titus says:

        I agree with Glen. i have sufferd from the hum for a number of years, and my work as a scientist and holidays have taken me to a number of places in Europe, the UK, South America, and across Canada. I have never found a peaceful place; just various levels of intensity. (The worst has been the south of England, along West and East Sussex coast; SW coast of Vancouver Island is a close second.) There is the possibility of background industrial noise, so I am most interested in places where there is minimal chance of this, such as Cooden Beach, East Sussex (where my in-laws used to live), Storth in the Lake District (home of friends) and, say, Sooke Harbour (parent’s house) and Port Renfrew (Vancouver Island) on clear days when there are no ships visible in the straits. I check Glen’s map from time to time – but only for places that are really remote, where there is little chance of industrial noise – these are the ones that suggest to me that location may be relevant to intensity but not existance. Time for a trip to a place with a “quiet room”, such as Minneapolis… (Thanks for the map, and your continuing work, Glen!)

      • Good to hear from you again, Brian. I think I’ll contact the regional universities to find out if a similar facility is available – but here’s the catch: at night, with the building power turned off.

      • Moray Rumney says:

        Hi Glen. Can you clarify your comment about population density and hum perception? If location is not relevant then I would expect the reports of hum divided by the local population density to show a uniform distribution across the world. Is that the case? There are obvious problems with this simplistic measure in areas with near zero population and areas where awareness of the hum map may be low e.g. most developing countries.


      • Good question. I glossed over a lot of complexity, so let’s unpack some of it. First, there is a strong overall correlation between population density and Hum reports (overlaying the two maps shows this in a striking way). From the data I’ve gathered so far, the claims that a person can drive a few dozen (or hundred) kilometres to escape the Hum are not supported at all. That is, the World Hum “follows” people wherever they go. But it’s more complicated than that. Let’s suppose that a Hum Hearer lives in a large, busy apartment block above a busy highway (24/7) and that there is on-going construction and music playing. That person will never hear the Hum. Similarly, if a person is living by himself far, far out in the wilderness, but his cabin is located right beside a large waterfall, he will never hear the Hum there. So when it comes to large and densely populated cities, you can see that two factors are working against each other. Namely, the fact there are a lot of people in one place means there will be more Hum hearers there, but the louder and more active the city, the less likely it is that people will notice the Hum (especially those who don’t know that they can hear it). The former factor tends to outweigh the latter from what I can tell, but there is still quite a bit of guesswork involved at this stage. As for the language barriers and internet connectivity issues, that adds even more complexity and unknowns. I hope this begins to address, in a superficial way, the issue you raised. Feel free to follow up. Glen.

      • Moray Rumney says:

        OK, so it is more complicated. I had been assuming hum concerns were well above background city and natural noise levels so would not have considered that aspect. But in saying there is strong correlation between population density and hum reports you would expect the patterns to be similar but is there any analysis e,g. reports per 100,000 population that show the location independence you claim? E.g. If we take 100,000 population in Kansas (a vast area) and compare to 100,000 in NYC, do we see the same reporting rate?

      • About 18 months ago I stated that Vancouver Island (in BC, Canada) had a substantially higher ratio of Hum reports to population than South Dakota did. I qualified that at the time, but now, upon reflection and after gathering more data, I feel very uncertain about that conclusion. I live near Vancouver, and my project’s visibility and name recognition here are high. This issue you raise is one of a dozen that can and should be explored. The work continues, and all contributions of time and effort are welcome.

  4. Steve Kiley says:

    Interesting from Brian Titus.
    I live in Bristol UK, and have experienced the hum for over twenty years.
    The only time it isn’t audible, is after a thunder storm, which we don’t get very often.

  5. Mona says:

    Having lived in Asia, Europe, America and Canada, I have concluded from my experience the direct correlation between mobile towers and the hum. Where the cellular coverage is good the hum I experienced was high and where the cellular coverage was low, I did not experience the hum. This also explains the pervasive nature of this in Europe and America’s. This also links directly with rising brain tumours.

  6. George G. says:

    Let us not forget The Hum precedes moblie phone use by almost three decades.

    As to “—links directly with rising brain tumours.”

    The highly respected research institutes listed below all independently reported no links with head and/or neck cancers and mobile phone use.

    a) Interphone

    b) Danish Study

    c) Million Women Study

    • Steve Kiley says:

      For George G.
      Yes, I first heard it the 80s, and I still hear it every night, except after a thunderstorm.
      I took my wife to the flat where I have been living for the last 6 months. She has never heard it before, but she could hear it in the flat, at one particular location.
      I moved everything out of the flat in the last few days, and I could still hear it before I left for good.

      • George G. says:


        I have been hearing it since the 70’s but my wife only began to hear it several years after we met. She now hears it occasionally, just before a storm, oddly enough.

        There has been speculation on this site that a pathogen may play a role here, perhaps it does, that may explain why couples tend to hear it sometimes together and sometimes singularly.

        Interesting and intriguing subject.

      • Steve Kiley says:

        Thanks for replying.
        It is definitely the case that I only hear it indoors. I’m not sure what my wife heard is the same as what I hear, as it was continuous, rather than stopping for a few seconds.
        I hadn’t heard about the pathogen, so keep me informed if you can.

  7. Vinny Setala says:

    I have been attempting to find the location(s) of Hum sources here in SW WA, and the part I “hear” seems to be a low grinding sound, but checking around MW towers (nothing) checking railroad tracks some is vibroacoustic) but over the 4th, it sounded (and felt) like LFN to ELFN from the railroad for hours on end. I called a friend who lives a few hundred yards from the same tracks. He said something was very wrong. He was hearing the (very odd ) and continuous “train rumble” walked to where he could see the tracks. Funny thing…the noise was there, the trains weren’t.

    Strangely, there were a fairly large number of people (mostly elderly, some very young) who ended up in ER’s, admitted for “flu like” or “unexplained symptoms” So…I can find no easily identifiable source except for very loud, very invisible trains. I personally think it is a combination of the various theories, but do not ascribe to a malevolent primary objective of harming people. No sense or money in that? But why did Glenn suddenly change his mind out the box they made? One of those “behind the woodshed” talks we’ve heard about (a la ART Bell?) or what.

  8. Basically correct.
    If the sound (your neighbors mower, say) comes through the air (a gas) and strikes you exterior wall (a solid) there is a severe impedance mismatch, and a great deal of the wave is reflected. If the sound is produced IN the ground, and travels through the solid ground to a solid wall, there is a minimal mismatch of impedance at the wall, and little loss. House-wall to interior air to your ear is the same in both cases.
    Sound waves are longitudinal, and, distant from the source, tend to NOT emerge from the ground (again, a solid/gas impedance mismatch).
    A sound wave in the ground longitudinally encountering a wall is much like a loudspeaker, as you suggested.

  9. J.O. says:

    I just wanted to post an observation. Most of us agree that the HUM is much louder inside our homes than out. Which is NOT true for general outside noises like your neighbor mowing their lawn.
    So the local utility company is doing some work along a road that is about 1/3 of a mile from my home. They are using a “hydrovac” to basically excavate holes to pull lines under the pavement. The hydrovac basically liquefies to soil and sucks it into a tank. So I just found it remarkable that I could hear this hydrovac process much louder inside my home than I could outside…similar to the HUM. Why? Is the sound transmitting through earth and then into my cement foundation?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: