Droning Hum all night long near Camp Long

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This topic contains 42 replies, has 0 voices, and was last updated by  LesleyB 4 years, 5 months ago.

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  • #593516

    LesleyB
    Member

    Hi we live very close to Camp Long on the hill that looks over Delridge and all night long we heard a droning hum – sounds like a distant airplane, but continual. It’s been going on nonstop now for at least 8 hours and is still happening right now at 7am. It gets louder and softer in a repetitive way over the course of 30 seconds or so. Does anyone know what this is? We have only heard it once before. It’s annoying enough to want to drown it out so we can sleep.

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    #686201

    velo_nut
    Participant

    THE WEST SEATTLE HUM MYSTERY CONTINUES!!!!!

    Goldfinger’s secret layer, I think. Either that or it’s the steel factory, the ferries, a top secret boeing aircraft, a 400 cycle TG on a freighter, the motor on the lower drawbridge, someone having sex next door…

    Ponderous man, really ponderous.

    #686202

    LesleyB
    Member

    4:45pm – just got home from work and it’s still going on. Continual and constant. I’m going to investigate.

    #686203

    GenHillOne
    Participant
    #686204

    LesleyB
    Member

    Thank you for the links. Many of them describe exactly what’s going on. It’s 6:30 and still going on. I drove around to see if I could get closer to it – found that I didn’t hear it all near Nucor. When I drove closer to the Duwamish – at SSCC, it was even louder. Must be something industrial down there. It’s miles away – must be loud! I don’t mind the trains or the planes (in general), but this is annoying because it’s nonstop! –

    Anyone think it might be the Lafarge Cement Plant? – it is directly east of where I live (the 5400 block) and also directly below SSCC.

    #686205

    CrazyDogLady
    Member

    We live on not far from Providence Mt. St. Vincent. Right now I am typing this (12:43 a.m. Weds. morning) listening to the hum increase and fade…increase and fade. My husband noticed it the other night and pointed it out tonight, too.

    #686206

    christopherboffoli
    Participant

    It was really loud around the Junction around 11pm. I actually took a quick drive around to try to see if I could figure out the general direction of the sound. But it was bouncing off of everything so it was difficult to pin down.

    #686207

    sam-c
    Participant

    really loud in puget ridge too, enough to keep us awake. in my half asleep stupor I almost went outside barefoot to walk around and try to find out what it was. have heard it very loudly for the last 3+ nights, and wonder if this is the reason why our toddler who typically sleeps through the night has been up in the middle of the night unable to sleep for the past 2 weeks- nothing else has changed.

    it’s maddening.

    #686208

    jwws
    Participant

    I heard it last night for the first time on Genesee Hill. I remember waking up thinking it was a container ship but it just kept on going so then I realized I was listening to the infamous West Seattle Hum. Alien spacecraft piloted by night-fighting ninja squirrels perhaps……

    #686209

    LesleyB
    Member

    Glad I’m not crazy!!! I have been hearing it on various evenings and nights since my first posting, as well, but none of them have gone on as long as the first time (over 22 hours!!!) Considering moving my bedroom to the west side of the house to reduce some of the sympathetic resonance that the east side of the house experiences from it.

    I don’t want to obsess over this, but if we can figure out what it is, we should at least try to get the source to stop after 10pm.

    #686210

    CrazyDogLady
    Member

    Have you heard it lately? I haven’t noticed since last I posted. Full disclosure: This is Mary Sheely (CrazyDogLady is my pre-writing-for-WSBlog name) and I’ve been thinking about going full-on late night Hum Chasers mode, but it looks like WSB has tried but never able to pinpoint the source.

    #686211

    MTM
    Member

    Backside of the Alaska Junction…. heard it off and on the same night as the first postings. I kept thinking it was a car running outside, but when I’d go out to look, the sound would move around. It’s weird. I heard it for a little while last night, but then the wind drowned it out. I hear ships on the sound sometimes, echoing off the W. Seattle hills but this hum is different.

    #686212

    bill8437
    Member

    Been hearing it north of Westwood Village since April 09.

    #686213

    LesleyB
    Member

    I haven’t heard it in a few days, either. I am pretty positive it is coming from the Duwamish, though, as it is VERY loud at SSCC coming from the east. One of these times, I will drive down West Marginal and try to find it.

    #686214

    CrazyDogLady
    Member

    LesleyB, feel free to PM or DM me (whatever it’s called on here). Together we can be a hum-fighting team.

    #686215

    JayDee
    Participant

    As a disciple of Cliff Mass, I would recommend you focus your hunt on those nights where there is a stable layer of clouds above us (stratus) or fog. The stable atmosphere and likely temperature inversion above West Seattle is probably reflecting the sound from the Duwamish Corridor. Active weather impedes formation of stable reflecting layers.

    Oddly enough I suspect the source isn’t Nucor just because the sound is more likely to reflect at shallower angles rather than at steep ones (IMHO–I am a generalist when it comes to science). Like light, the simplest explanation is that sound travels at equal angles–A sound wave hitting the temperature inversion at 25 degrees will reflect off the at 25 degrees. So the Duwamish corridor is the more likely suspect.

    While I live near Alki, an out-of-town guest over New Years asked: “Where is the train?” so we went on a drive the following day to Harbor Island. Good hunting (my two cents).

    #686216

    WSB
    Keymaster

    I think this came up in one of the earlier discussions, but … While leaving the West Seattle Crime Prevention Council meeting (story in the works) a little earlier tonight at the Precinct, I noticed Home Depot had some sort of vehicle (I don’t know if it was a mini-forklift, the parking lot equivalent of a Zamboni, or what) running around (close to 8:40 pm) and humming like mad. That’s down the hill from some of the areas that frequently mention The Hum O’Mystery.

    #686217

    velo_nut
    Participant

    Jesus H Christ people.

    The answer is this….

    it’s the 400 hertz from the the steel plant.

    All of you that want to go out and hunt it down will get NO WHERE due to the frequency.

    There is only two places you will feel a 400hz tonal… a nuclear submarine motor generator and the steel plant in West Seattle.

    #686218

    celeste17
    Participant

    Hey Velo,

    Thank You for this information. How long have you known what has caused the hum? How do you know that this is what is causing the hum? I have never noticed it so it doesn’t bother me. I enjoy information and whenever I can I look information up on the internet.

    #686219

    dawsonct
    Participant

    Yeah Velo, quit holding out. Where did you come by your information? And when you refer to a “400 hz”, what exactly are you talking about? A generator? How did you arrive at your certitude.

    I’ve never noticed the hum, but Velo’s oblique response to this subject is a bit irritating.

    #686220

    JayDee
    Participant

    From Wikipedia:

    http://en.wikipedia.org/wiki/Utility_frequency

    Skip to the bottom and there is a little audio track comparing 50 Hertz (Hz) noise, 60 Hz noise, and 400 Hz noise. Now as I haven’t heard the mystery hum, so I can’t say whether velo-nut is correct in his assumption, but perhaps others who’ve heard the hum can see if the tone is right.

    While Nucor may use 400Hz frequency power for their mill I was not able to source this on the Intertube. The 400 Hz tone sounds pretty high in pitch, so it should be distinctive if Nucor was the source. Also Nucor shuts down frequently as market demand and maintenance requires it too, so if you hear the hum and Nucor isn’t melting iron, that would rule them out.

    #686221

    LesleyB
    Member

    I’m actually a trained audio engineer with a little equipment, so next time i hear it and have a chance, I will try to find out what the frequency is. Also, with regards to the cloud cover, that can be accurate, but with low bass waves, they tend to travel far, and also move around objects that are in their way. They are sort of omnidirectional, which is why it is very difficult to isolate sounds from bass frequencies when you are setting up a mic to record something. I’d be interested to find out if its 400hz – that seems kind of high to me. It physically shakes my bedroom wall.

    #686222

    LesleyB
    Member

    CrazyDogLady, pardon my ignorance. I don’t know how to PM or DM. If you know how to do it to me, please go for it!

    And I’m starting to think maybe Velo Nut is making money or something from this hum, as he seems to be taking a lot of time to come onto this thread and discourage us from even talking about the Hum. ;)

    #686223

    JanS
    Participant

    LesleyB…there is no PM function on here….it’s been gone for quite some time now. If she wants a direct message, guess she has to give you her email addy.

    #686224

    JoB
    Participant

    velo_nut may have ruled out the steel plant..

    i have heard this hum and like LesleyB, think it too low pitched to be 400 Hz

    this is better than a scavenger hunt… can’t wait for her to measure it…

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