Merged Core-led collapse and explosive demolition

My guess is that sound would hardly be attenuated by interior crap as the majority of it would be carried on the front of the blast wave and once the glas breaks out the sound would follow pretty much unobstructed behind the mass of crap being ejected. Pretty much like the pop of a cork AFTER the cork is ejected. Hell, there are videos of demos where the viewers are a good distance away from the demo and you still hear the blasts clearly and loud.

As for mitigating one blast with another intervals. That is pretty much ridiculous as the the sound wave is moving away from the point of detonation and the next blast would only be following it. Then you are left with the last set of charges in the interval having no canceling pair.

IMO you could mitigate continuous low range sounds like a set of noise canceling headphones do but there is no way you could mitigate singular loud intervals of sound, again like noise canceling headphones. Those can drown out most low range noise but any loud sharp sound is heard, if a bit muffled.

I suspect too with the top of the container opening sound would escape through there as well.

Of course it is all moot since survivors of the collapse only describe sounds that describe the progressive collapse of the floors.
 
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....and here we are where people are hypothesizing about the attenuation of sound.

Attenuation of the sound of what?

ETA - boom center?

someone not proposing a hypothesis of bombs in the buildings said:
A boom center of core about 1200ft up. Pick a dB value for the boom,,,
What boom?
 
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Has anyone calculated yet the effects of the accumulated bird crap on the roof of the towers?

If not, why has this not been done?
 
What a lot of nonsense. Core and perimeter destruction initiated within about a second of each other.

You are TRYING to say that core destruction TRAILED perimeter destruction, but you seem a bit hung-up on primitive dialogue.

The *conspiracy* question you think is being posed is this...

Would a single *boom* up at floor 98 just prior to release be picked up by all the video cameras ? Incorporating how that audio signal would be affected by the structure to a microphone about 100m from the base.

Fun eh ? :)


Perhaps. I think such a *calc* would be useful in many ways.

Then do it.
 
I don't see either cost or effort being significant, but one result ? The output would basically be change in *volume* dependant upon a number of factors. I assume you believe that such change would be low ?

Again, the only way to know if you are right is to run the calcs.

I see you are not motivated to do so, but until someone does, this thread (and probably others) will continue and resurface ad infinitum.

I'd have to say that discussion of the thread topic without addressing this fundamental factor is pretty pointless. It could, as you say, be the element that you "could always reference that work and put to rest once and for all any theory of explosive demolition"

And no-one wants to have at it ?

Since you're the one who wants it you should do it.
 
Has anyone calculated yet the effects of the accumulated bird crap on the roof of the towers?

If not, why has this not been done?

Has anyone *done the calcs* on the exact stresses placed on each of the columns, the time they 'buckled' in relation to each other and their trajectories as they fell?
 
I see working out what a *boom* high up in the tower would actually sound like from various positions quite useful. You don't have to agree, but as far as I'm concerned anyone then mentioning how loud an event should be in the audio track of a specific piece of footage is talking out of their posterior. That ol' got math ? got physics ? meme y'know ;)

Might have a crack at it.

Here's the thing femr;
by illustrating the sound of demolition charges in known building demolitions we feel it is justifiable to discount the existance of demolition charges in the towers since no sounds consistent with known demolitions charges is heard in any audio track of the tower's collapses.

You and your fellow 9/11 speculators then attempt to get around this lack of audible demolition charges by claiming that the intervening structure and several hundred feet of air will attenuate the sound enough so that it will not resemble the sounds heard in known demolitions.

Yet you have tried and tried to have those of us who do NOT contend this to attempt to show calcs. Seems to me that this work is up to those who DO propose such a mechanism at work. That's you!

There are other problems for such a theory though. Let's say that you did prove beyond a shadow of a doubt that the sound would be sufficiently muffled so that it does not even resemble the sounds heard in audio tracks of known demolitions. You still have not proved that such charges were in fact in the structures. All you have done is disprove the contention that there should be such sounds. Any contention that a lack of such sounds proves demolitions charges would be an appeal to ignorance (ie. 'since we cannot prove or disprove their existance they were probably there')

Personally I have been about 150 feet from the open air blast of two sticks of dynamite. I have been 1 mile(5000 feet+) from, ( and still in sight of) an un-matted rock blast (highway construction through Canadian Shield granite) and as I said before I have experienced a mining shot a 1000+ feet below my feet. In the first two cases the one thing that characterized the blast is that it is freakin' loud. In the rock cut blast, I, and all of the construction workers with me knew the blast was coming, we heard the warning whistle, we heard the countdown and 'fire in the hole', and yet with out exception we all jumped a bit at the sound. We were several times farther away than the people at street level in Manhattan!
The mining shot was less loud but had a very definite 'feel' to it.

jig wishes that an explosion is a soundwave just like the sound of a voice. I do believe that you know better.
 
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It is a fact that, from time to time, posts by 'debunkers' are riddled with inaccuracies or fallacious reasoning. As I said in the thread you've dragged this argument from, I fondly imagined the same standards of critical thought would pertain to this sub-forum as they do elsewhere on JREF, but apparantly here the bloodlust is rampant and anyone who doesn't stand with, or dares to criticise a post by a member of, the aggressively dominant group is assumed to be part of the other, 'enemy' group.

Interesting, jiggery. I kind of suspected as much, but haven't investigated, perhaps being too disenamoured by the level of argument offered in this forum. If this is true, it does not reflect well on JREF as a whole. Good to know that there are people capable of rational, disinterested argument elsewhere on the board, however.
 
Incorrect. Explosions certainly were heard by many people on 911. It would be strange had they not.


Really? Why don't we hear them on the video footage or the phone call recordings then?
 
Personally I have been about 150 feet from the open air blast of two sticks of dynamite. I have been 1 mile(5000 feet+) from, ( and still in sight of) an un-matted rock blast (highway construction through Canadian Shield granite) and as I said before I have experienced a mining shot a 1000+ feet below my feet. In the first two cases the one thing that characterized the blast is that it is freakin' loud. The mining shot was less loud but had a very definite 'feel' to it.

.

I know I've said this before but, I've been to three controlled demolitions. Each time I went with a friend (that happens to be deaf). She has seen dozens of these things, she like to go because they're the only thing she can "hear".
 
I've lost count of the number of times that folk have stated that because there were no *booms* in the audio track of video footage (x) filmed from location (y) with directional camera oriented (z) that there were no *booms* at all, yet in the same breath state that *booms* that are present in audio track (b) cannot possibly be anything but (c) and a window pane breaking would sound exactly like that in recording (d)...

All without having any quantifyable way of determining how the sound will be affected by the factors I'm pointing towards. Pretty lame.

I see working out what a *boom* high up in the tower would actually sound like from various positions quite useful. You don't have to agree, but as far as I'm concerned anyone then mentioning how loud an event should be in the audio track of a specific piece of footage is talking out of their posterior. That ol' got math ? got physics ? meme y'know ;)

Might have a crack at it.

Something like this perhaps?

Yeah people heard "explosions", but see my previous post for that. What NOT ONE SINGLE PERSON heard that day was this.

There is a difference between a few isolated "booms" here and there at various locations at random intervals, and this. If you cannot tell the difference, you are deaf and/or stupid.

Most likely the latter since you think that anybody is buying your "I'm TOTALLY not a truther, guys!" shtick while every single post you make is only ever directed at one side. We've seen Truthers pretend to be "on the fence" more times than I can count, only to eventually give up the act and go into full Space Beams mode. People like you are a dime a dozen. Nobody is buying it. You are not accomplishing anything. People who are genuinely neutral question both sides equally; I have yet to see you question a Truther or challenge a Truther claim.
 
Here's the thing femr;
by illustrating the sound of demolition charges in known building demolitions we feel it is justifiable to discount the existance of demolition charges in the towers since no sounds consistent with known demolitions charges is heard in any audio track of the tower's collapses.
That would be the Royal *we* one would assume. You can feel justified in any stance that you please, but in the process you reduce the quality of your critical thinking/skeptical viewpoint/knowledge to what is in my opinion useless banter based upon gross assumption, gross misrepresentation of the scope of what I'm discussing and ample amounts of handwaving.

You and your fellow 9/11 speculators
Your first mistake. By applying primitive grouping of your personal belief of various different peoples viewpoints, you end up writing nonsense...

then attempt to get around this lack of audible demolition charges
Your second mistake. I'm not trying to get around anything in the slightest. That's an invention within your own private world I'm afraid. I'm simply trying to quantify the effect upon loud sound sources in the real world environment. You don't know the extent. Neither do I. I'm curious to find out. You're not. Your paranoid assumptions are therefore quite humerous to me.

by claiming that the intervening structure and several hundred feet of air will attenuate the sound enough so that it will not resemble the sounds heard in known demolitions.
Your third mistake. I make no such claim. Yet again you are applying your own nonsensical assumptions. I'd quite like to know how much the sound is attenuated, sure, but not by something as primitive as air. That's just a pathetic lack of understanding about the question in hand. Through air you're talking about a 7dB reduction over about 100m. I'm wondering about the effect of a sound in the center of the building a 100 storeys above the receiver, which itself probably has a directional microphone.

Yet you have tried and tried to have those of us who do NOT contend this to attempt to show calcs.
Your fourth mistake. I've stated repeatedly that I doubt anyone has the motivation nor ability to do so, but that doesn't change the fact that I'd like to find out the *answer*. As I've also said repeatedly, I may do so myself.

Seems to me that this work is up to those who DO propose such a mechanism at work. That's you!
Your fifth mistake. You carry forth your paranoid assumptions from your earlier mistakes. There is no doubt at all that some attenuation will occur. The question is how much. As I've said, yet again, I may do the leg work. As I've also said, until someone does, claims or conclusions such as those in your first paragraph are based upon nowt but hand-waving and belief, rather than that ol' beachnut favorite math and physics. That anyone should object to the suggestion of actually working out the real world behaviour is laughable, though very common in this place. If all you have to entertain yourself is *twoofer baiting*, have fun. Sad waste of time in my opinion, but knock yourself out. There's only one point of interest for me in this thread, that I identified at post one, namely, what's the ACTUAL effect on the sound of a *boom* high up in the tower ? You don't know. You haven't done the leg work. Well done. Fingers in ears. lol.

There are other problems for such a theory though.
Where are we, sixth mistake ? No theory braniac, simply the interest to understand the actual behaviour, but continue by all means...

Let's say that you did prove beyond a shadow of a doubt that the sound would be sufficiently muffled so that it does not even resemble the sounds heard in audio tracks of known demolitions.
Getting boring this. Who said that is what the outcome would be ? In direct contrast, you may not my reponse to the suggestion earlier that such a *study* could be used to put a nail in the coffin for any suggestion of the presence of explosives. You guys really do tend to kick yourself in the teeth repeatedly you know :rolleyes:

You still have not proved that such charges were in fact in the structures.
In what way do you think I'm trying to ? LOL. See my pre-release motion data for WTC7 and WTC1 and ask yourself in what way doing so is an attempt to suggest that explosives at the point of release is the cause of subsequent descent ? Idjits :)

All you have done is disprove the contention that there should be such sounds.
You really are off in some fantasy land. Meanwhile back on planet earth...

Any contention that a lack of such sounds proves demolitions charges would be an appeal to ignorance (ie. 'since we cannot prove or disprove their existance they were probably there')
Oh yawn. You don't want to understand the actual behaviour of the sound wave because it is not convenient for your personal crusade ? ROFL.

Personally I have been about 150 feet from the open air blast of two sticks of dynamite. I have been 1 mile(5000 feet+) from, ( and still in sight of) an un-matted rock blast (highway construction through Canadian Shield granite) and as I said before I have experienced a mining shot a 1000+ feet below my feet. In the first two cases the one thing that characterized the blast is that it is freakin' loud. In the rock cut blast, I, and all of the construction workers with me knew the blast was coming, we heard the warning whistle, we heard the countdown and 'fire in the hole', and yet with out exception we all jumped a bit at the sound. We were several times farther away than the people at street level in Manhattan!
So ? Apples and oranges. Perhaps the result of working out the *math and physics* would be that the amplitude would be almost as high as at source, perhaps not. Without looking at the actual, or comparable scenario you're waving hands.

The mining shot was less loud but had a very definite 'feel' to it.
So ? In what way would a microphone record that *feel* in your opinion ? :)

jig wishes that an explosion is a soundwave just like the sound of a voice. I do believe that you know better.
Sure, but hardly the point in hand. Stephen Evans probably had an opinion on that at some point, but hey ho. I'd like to determine what a microphone 100m from the base of WTC1 would pick up if there was a *boom* in the center of the core up at about floor 98, for whatever reason you choose to assume.

Have fun.
 
I'm simply trying to quantify the effect upon loud sound sources in the real world environment. You don't know the extent. Neither do I. I'm curious to find out. You're not. Your paranoid assumptions are therefore quite humerous to me.


To what end? Simple curiosity, or to prove the existence of explosives?
 
That would be the Royal *we* one would assume. You can feel justified in any stance that you please, but in the process you reduce the quality of your critical thinking/skeptical viewpoint/knowledge to what is in my opinion useless banter based upon gross assumption, gross misrepresentation of the scope of what I'm discussing and ample amounts of handwaving.

Did you go to school for this level of BS?

First of all, you are asking for an analysis of something that no one has shown a reason to believe happened in the first place. Then when someone shows ample examples of real world cases of what you claim, you want people to analyze what could be done to make what is shown less obvious. You then turn this around and call it "useless banter based upon gross assumption", "gross misrepresentation of the scope of what I'm discussing" and "ample amounts of handwaving".

WTF! First show that this work is needed. Do you have any reason to believe that explosives were used or needed to bring down these buildings? If so where is this proof and what is the motive. In other words. Do you have a comprehensive theory?
 
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They are not capable of understanding such simple statements I'm afraid.

Ergo is talking about multi-floor demolition. I'm talking about clarifying understanding of how the sound of a *boom* high up in the tower would be affected by the intervening structure and materials, and how the location and orientation of source and receiver would come into play.

Yet they can't tell the difference between us. Yikes :jaw-dropp Not too smart.

I still think it would be a useful thing to determine, but it's pretty clear that none of the regular posters have any intention, or more probably the capability, to perform such.

Hey ho. Perhaps I'll have a stab at it, then drop it in and watch the complaints begin. I'll leave out diffraction in the first run-thru ;)


FEMR, I posted 4 videos of a person up high in a building (sorry not a tower) located several hundred feet away from a location through walls, glass and partitions were able to record CD charges going off.

I'm still waiting for you to comment on those videos and how they show exactly what you are claiming there is no proof for.
 
They are not capable of understanding such simple statements I'm afraid.

Ergo is talking about multi-floor demolition. I'm talking about clarifying understanding of how the sound of a *boom* high up in the tower would be affected by the intervening structure and materials, and how the location and orientation of source and receiver would come into play.

Yet they can't tell the difference between us. Yikes :jaw-dropp Not too smart.
...

The difference: ergo wrote the OP and thus set the topic of the thread. By discussing his delusions I stay on topic.
You try to lure us off-topic on purpose.

Why don't you open your own thread to pose your own question and discuss your own topic?
 
Really? Why don't we hear them on the video footage or the phone call recordings then?

Because they were much much softer than the bangs of high explosive charges capable of cutting structural steel. They were so very insignificant, so harmless.
 
I know I've said this before but, I've been to three controlled demolitions. Each time I went with a friend (that happens to be deaf). She has seen dozens of these things, she like to go because they're the only thing she can "hear".

I liken the non-auditory sensation to having someone slam you in the chest with a pillow.
 

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