It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
originally posted by: MALBOSIA :
Didn't LaBTop explain all this to you vividly in another thread and you conceeded that his evidence was too long and complicated and it was unfair to expect you to understand it? That was you right?
neutronflux : You mean the individual stop posting after calling their bluff and never providing a rebuttal to:
www.abovetopsecret.com...
The pictures at the end, of the diagonally cut steel columns were not from the crucial floors, and can as easily have been cut by crews after the collapses. Therefore it's not defendable, we do not have time stamped pictures of such steel cuts, where for sure no acetylene cutter crews were present on the WTC steel debris heaps.
neutronflux : You mean the individual stop posting after calling their bluff and never providing a rebuttal to:
www.abovetopsecret.com...
neutronflux : a reply to: LaBTop
Let’s review.
The historical seismic activity shows a building collapse is expected to transmit Rayleigh waves.
Rayleigh waves would change in amplitude as items with different masses with different kinetic energy hit the ground.
“Underground explosions would have produced strong P waves” which are not present in the WTC seismic data.
In fact, the recording for WTC1 (Fig. 2a) demonstrates the three types of wave characteristic of a brief explosive source confined in a compact, solid material: a P wave with a speed of 6000 m/s, the typical value for a very consolidated crystalline or sedimentary terrain (which is the case in the bedrock of Manhattan), an S wave with a speed of 3500 m/s, and a surface wave with a speed of 1800 m/s (a Rayleigh wave).
These values match those registered from an earthquake or seismic prospecting (see for example Kim et al. 2001).
On the other hand, the recording linked to WTC2 (Fig. 2b) does not show the P or S body waves observed for WTC1 but only the surface Rayleigh wave, for which the spreading of the amplitudes over the duration is different from that of WTC1. The propagation speed of 2125 m/s is also markedly different from that of WTC1. Further, this wave seems to be followed by a second Rayleigh wave four seconds later.
We find the same thing for WTC7 (Fig. 2c), where the calculation of the speed of the wave according to the determined origin time indicates a Rayleigh wave with a 2200 m/s speed. Note that the amplitudes are comparable to those of the waves emitted at the time of the crashing of the airplanes into the Towers. This wave seems to be followed by a second Rayleigh wave 6 or 7 seconds later.
In the three cases, the bell-like form points to an impulsive source of energy, not percussion on the ground due to the fall of debris. The total mass and the average mass of individual building fragments were relatively small and fell to the ground over a period of more than ten seconds (which is a very long time in geophysics). Also note that the duration of a seismic signal does not tell anything about the source, in distinction from the amplitude and, particularly, the frequency.
Finally, we refer you to a 2012 article by Andre Rousseau, an expert in applied geophysics and the author of more than 50 published papers on progressive mechanical waves and geology. Published in the Journal of 9/11 Studies, his article is titled, "Were Explosives the Source of the Seismic Signals Emitted from New York on September 11, 2001?" We find Rousseau's article to be (LT : among) the most definitive analysis of the seismic evidence to date.
To remain relevant, the biggest pusher of controlled demolition, Architects and Engineers, abandoned the narrative of kinetic detentions brought down the towers in favor of thermal cuttting devices?
You cite a seismic narrative debunked, abandoned by the biggest group pushing WTC CD, and ridiculed by other conspiracists.
There is no seismic evidence of conventional implosions at the WTC. Get over it.
We concur with the 9/11 Consensus Panel’s conclusion and recommend reading its article, reprinted below, as the most efficient way to understand the significance of the seismic activity at the World Trade Center. For ardent students of the subject, we advise reading all the references provided below.
Dr. Andre Rousseau November 1, 2012
Abstract: The seismic signals propagating from New York on September 11, 2001, recorded at Palisades (34 km) and published by the Lamont-Doherty Earth Observatory of Columbia University (LDEO), have here been subjected to a new critical study concerning their sources. The aim of this paper is to demonstrate that the nature of the waves, their velocities, frequencies, and magnitudes invalidate the official explanations which imply as sources the percussion of the twin towers by planes and the collapses of the three buildings, WTC1, WTC2 and WTC7.
First of all, we show the contradictions in the official explanation between the seismic data and the timing of the events. Then we point out that it is strange that identical events (percussions of identical towers on the one hand, and collapses of identical towers on the other hand) at the same location would have generated seismic sources of different magnitudes. We demonstrate that only strong explosives could be the cause of such seismic waves, in accordance with the observed low frequencies. According to the nature of the recorded waves (body and surface waves), we can propose a location of each explosive source. According to the presence of shear waves or the presence of Rayleigh waves only, we hypothesize a subterranean or a subaerial explosion. The magnitude of an aerial explosion is insufficient to provide seismic waves at 34 km.
The witnesses and video observation confirm our conclusions of subaerial explosions close to the times of aircraft impacts on WTC1 and WTC2, a strong subterranean explosion closely correlated with the WTC1 collapse, and subaerial explosions closely correlated with the WTC2 and WTC7 collapses, WTC7 not having been hit by a plane. As a consequence, we draw the conclusion that the three buildings were demolished by a controlled process.
Page 2 /23 : The new interpretation presented here renders the assertions of the seismic analysis of the events at the WTC, as presented by the government in the NIST and other reports, null and void. On the contrary, all the documented evidence points to explosions as the source of the recorded seismic signals.
Subterranean explosions are similar to earthquakes in that mechanical energy is transmitted to the earth in the form of body waves of two types, P and S (for "primary" and "secondary," or "pressure" and "shear"), and surface waves (either Rayleigh or transverse L) when the signal reaches a solid-fluid interface (for example, the atmosphere at the surface). Another name for Rayleigh waves is ground roll.
Aerial explosions release all of their energy in the air (as P waves, which in the atmosphere are simply sound waves), and what remains upon hitting the ground is thus too weak to create body waves in the solid earth (although there can be surface waves over a small distance).
Subaerial explosions give off energy that splits into sound waves, mainly in the air, and surface waves in the ground.
EXPLOSIONS THE SOURCE OF 9/11 SEISMIC WAVEFORMS
A subterranean explosion might not be heard, but the ground would shake and initiate a series of waves (body and surface waves). If we distinctly hear an explosion, it is either aerial, which does not give a seismic signal, or it is subaerial, in which case surface waves could be generated. The seismic wave data provided by Palisades prove the occurrence of surface waves radiating outward from the World Trade Center. In addition,
witnesses reported hearing explosions very close to the times at which planes struck the Towers and when they collapsed (see particularly MacQueen, 2006). (LT : look him up in the References)
Given these two types of evidence we can affirm that subaerial explosions occurred close to the base of the Towers almost or quite simultaneously with the crashes into the Towers by the planes. The sound coming from these explosions would have been mixed with the sounds generated by the impacts of the planes. The explosion at the base of WTC1 was heard and reported by William Rodriquez (Spingola, 2005).
democracydemo : What is it with this "silent detonation/explosion" conundrum when
NIST FOIA 09-42: R14-UC -- Jim Huibregtse 1A-25 (WTC1 Burning/WTC2 Collapse/WTC 1 and 7 Plumes)
has audible evidence; minute marker 14:48 to 15:15
www.youtube.com...
The destination page for the TinyURL you visited appears to have been removed, had its name changed, or is temporarily unavailable. It seems you are attempting to visit: video.google.com...
== StevenM818 :
This Google Video captured the explosions: 27minutes, 45seconds in :
www.tinyurl.com...
Then at 29:07, Reporter Al Jones gives his eyewitness account, saying that it looked like WTC-7 was brought down by a demo crew. He then goes on to explain that it was brought down by an "explosion" :
www.tinyurl.com...
And then at 31:09, a witness who's interviewed, says he heard a loud noise that sounded like "a clap of thunder", & then WTC-7 started to fall :
www.tinyurl.com...
originally posted by: LaBTop
Neutronflux, did you ever take a serious good look at your own posted videos, where you keep trying to tell us for more than a year by now, that core column spires kept standing a long time after the surrounding floors had collapsed?
That's incorrect.
Those spires were NOT core column parts, but a corner perimeter column with still Vierendeel parts attached, and these still erect parts then suddenly slid down in itself, they did not topple over, as you should expect from a natural collapse.
www.skeptic.com...
9/11 and the Science
of Controlled Demolitions
3WHAT ABOUT THE ALMOST FREE-FALL COLLAPSE OF THE TWIN TOWERS? The key is the “almost” modifier. If I told you I was making almost $100,000 and you found out I was making only $67,000, you’d say I was exaggerating. So stop exaggerating the collapse speed of the WTC Towers! The 80,000 tons of structural steel slowed down the collapses of the Twin Towers to about ⅔ (two-thirds) of free-fall.3 And the core collapsed at about 40% of free-fall speed, coming down last.4 According to Richard Gage: “To bring a building symmetrically down, what we have to do is remove the core columns.” But on 9/11 the stronger core columns came down last, which violates this supposed most fundamental rule of controlled demolition.
Originally posted by: neutronflux
A reply to: LaBTop
en.m.wikipedia.org...
A thermobaric weapon is a type of explosive that uses oxygen from the surrounding air to generate a high-temperature explosion, and in practice the blast wave typically produced by such a weapon is of a significantly longer duration than that produced by a conventional condensed explosive. The fuel-air bomb is one of the best-known types of thermobaric weapons.
You
And when thermobaric explosives, the disc shaped versions, were used, as I highly suspect they did, you and the video camera microphones would only hear a thunderclap sound if you were near enough
One didn’t you start this thread it had to be underground explosions?
Two, the truth movement claims the resistance of each floor had to be removed to achieve the witnessed collapse rates of WTC 7.
9/11: WTC 7 Collapse (NIST FOIA, CBS video)
m.youtube.com...
Three, there is no audio of “thunderclaps” cutting te resistance floor by floor.
Four, still no high speed pressure waves leaving the building floor by floor.
Five, no flashing of detonations setting off.
Six, no evidence of steel columns worked on by explosives.
You are full of BS
LT : And when thermobaric explosives, the disc shaped versions, were used, as I highly suspect they did, you and the video camera microphones would only hear a thunderclap sound if you were near enough -snip-
originally posted by: neutronflux
A reply to: LaBTop
Look at me. I am LapTop. I going to post page after page of trash to avoid honest debate. Push everyone’s reasonable response and questions into the background.