It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
originally posted by: AnkhMorpork
a reply to: neutronflux
The façade is a façade. You know how the building was made of and how it fell and you know what I mean by uniformity.
The unsupported Column 79 then buckled and triggered an upward progression of floor system failures that reached the building's east penthouse. What followed in rapid succession was a series of structural failures. Failure first occurred all the way to the roof line—involving all three interior columns on the easternmost side of the building (79, 80, and 81). Then, progressing from east to west across WTC 7, all of the columns failed in the core of the building (58 through 78). Finally, the entire façade collapsed.
The probable collapse sequence is described in NIST NCSTAR Report 1A, Section 2.4 and NIST NCSTAR Report 1-9, Chapter 13.
To further clarify the descent of the north face, NIST recorded the downward displacement of a point near the center of the roofline from first movement until the north face was no longer visible in the video. Numerical analyses were conducted to calculate the velocity and acceleration of the roofline point from the time-dependent displacement data. The instant at which vertical motion of the roofline first occurred was determined by tracking the numerical value of the brightness of a pixel (a single element in the video image) at the roofline. This pixel became brighter as the roofline began to descend because the color of the pixel started to change from that of the building façade to the lighter color of the sky.
And now comes the most important and telling fact in this photo. Note the west side (Right side in this photo) of the north face is pointing toward the east side (Left side of this photo) where the penthouse was. What caused this? It would not be unreasonable to expect the building to fall toward the path of least resistance. The path of least resistance in this case would be the hole in the back of the building and the hole left by the penthouse. Since the penthouse was on the east and the 20 story hole in the middle, that would make the east and middle the path of least resistance. The conspiracy sites agree with this theory but say it never happened. They say the fact that it didn't happen helps prove controlled demolition. But you see it happen here... What will they say now?
WTC 7 Collapse Symmetrical?.mov
originally posted by: Fermy
The pair of you ask for credible explanations but give none yourself.
Point to proof of a detonation with enough power to cut steel? No witnesses pressure wave? No audible detonation indicative of a charge with the energy to cut steel? No demolition shrapnel? No seismic evidence?