WTC 1: NIST ignores earliest ejection along the 95th floor
WTC 1: NIST ignores earliest ejection along the 95th floor
The NIST claimed that the earliest signs of collapse initiation were along the 98th floor. This statement ignores much evidence visible from the outside of the building, including early movement of the antenna and northwest corner, detectable 9.5 seconds before visible movement begins.
Also, there are at least 3 sets of ejections and smoke pulses visible from the 95th floor, from the roofline and from as low as the 88th floor during the collapse initiation sequence and moments leading up to it.
None of these sets of ejections were mentioned within the NIST NCSTAR reports on the cause of the collapse. Each set of ignored ejections is described and shown below.
The 95th floor ejections from the southwest corner, west face
Timing of the first visible row of ejections within the fire-affected areas at this link
The first visible ejection in the region of collapse initiation is from the 95th floor, not the 98th floor as the NIST claims.
The roofline smoke pulses
The collapse initiation sequence seems to begin with a set of 11 distinct smoke pulses rising from the roofline
These pressure variations can be seen in momentary concentrated smoke puffs aimed upwards at the following times on the clip
SW corner (to the right): :07, :16, :21, :27
SE corner (to the left): :30
I'm counting 11 in total, 5 from the SE corner.at least 6 distinct accelerated pulses from the SW corner
The aspect I've found most strange is how, when watching the clip, I know at what moment the collapse begins by the rapid, concentrated smoke release upwards from the SE corner just before the building starts to move (at 0:31)
These puffs...
1) are so large they are easy to notice
2) accelerate upwards faster than the surrounding smoke movement
3) are always near or at the corners of the roof
Please notice that the last of these pulses, from the SE corner, is perfectly timed with collapse initiation. Intiation begins just as the pulse shoots upward.
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Within the video there is a shaking of the camera 9.5 seconds before visible collapse. A couple of posters have identified visible creep of both the antenna and NW corner beginning at the moment of the shake. The shake in the camera provides a great reference point with which we can watch the initiation sequence.
We now know that the following motion begins at the moment of the shake:
With this knowledge, please look carefully at the timing of the 11 distinct roofline smoke pulses again. Notice that a distinct set of pulses rise just as the camera shakes. (I am not implying the shake means any physical thing, but it is a great reference point to see when measurable, active creep begins. It gives the timing of the pulses a connection to the whole recorded and measured process.)
The 88-89th floor south face ejection
The purpose of the red arrows is to point to common events in order to synchronize the north view and south view videos.
Once synchronized, we can see that the strong light colored ejections from the middle of the south face emerge as low as the 89th floor and are visible when the antenna has tilted only 2 degrees and the NW corner has fallen only 0.5 seconds.
In the gif above, we can see from the images on the right that the NW corner has barely begun to fail when the south side ejections are visible.
According to the description of the upper block as a rigid rotating object, the 99th floor slab should be colliding with the 98th floor slab assembly at that moment.
Instead we see forceful ejections with what appears to be concrete dust as low as the 85th floor, as the video linked below shows.
The dust emerges when the northwest corner has only fallen a few feet.
The tilt angle varies from 0 to 2 degrees over this interval, meaning the south wall has fallen only about 12 feet by this time in the region of floor 98. The ejections emerge from around the 88th floor. They are light grey, not darker colored like the smoke and ejections above.
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Created on 05/19/2011 10:17 PM by admin
Updated on 09/25/2011 07:11 PM by admin
