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Originally posted on 31/10/06 by LaBTop
For me, the biggest question still is:
How and why did FEMA come to their conclusion that 20:33 was the initiation of WTC 7's collapse ?
I saw nothing happen in form of visual effects BEFORE the famous east penthouse denting at 20:46.
I see only one sane conclusion : someone high up forced or planted the idea in LDEO 's investigating minds, that this 20:33 seconds point was the start of all WTC 7 collapse events, because that someone had realized that that was the ONLY convenient way to mask what really happened, and that 33 + 17 is 50.
Which is the 10s point on that seismic graph (EDT 17:20:50), which so conveniently preceded all following seismic signals above the standard background noise levels.
Included that huge give-away peak, of Thermobaric Bombs-explosions (TB's).
Any later start of events timestamps would raise a LOT of eyebrows.
So, who came up with that 33 figure ! AND THE REASON for it, to use it !
Were there rumbling sounds at 20:33 ?
Or was it solely based on seismic interpretations? Which ones?
AND WERE THESE SIGNALS VISIBLE at all ON THAT (extended to EDT 17:20:30) SEISMOGRAM ?
And nobody can be accused, nobody who REALLY and honestly did not see the immense indications of that NIST time-stamp on that Cianca photo, compared with the LDEO data explanations.
I think nobody at LDEO at the time their report came out, (in the week of 9/11 already) ever saw that photo, it popped up in the much later government approved NIST reports.
And when the first reports came out, still nobody but me saw the repercussions of a side by side view of the 17:20:46 point on that LDEO seismic graph of the WTC 7 collapse, and the 17:20:46 time-stamped Cianca photo graph.
FOIA for THIS FULL LDEO SEISMOGRAM of the WTC 7 COLLAPSE !!!!!!!!!!
PS : Cianca's personal website (Google full name Nicolas Cianca) is down...... where you could find his 9/11 photo collection, and his remarks. He is the one who can explain a lot about the reason NIST put that time-stamp on his photo.
Even the WayBack website can not bring back a coordinated effort to find that photo and the accompanying text from Cianca him self.
His site disappeared around the time I posted the first time about the discrepancy between his timestamped photo and the timestamps on the WTC 7 LDEO chart.
They will not remove that photo, it is impossible, they realize that, they will take care that the seemingly-right answers will be given.... trying to weaken the arguments.
[edit on 31/10/06 by LaBTop]
A useful tool for analyzing audio is a spectrograph or sonograph which gives a visual display of frequency response over time.
A quick demonstration of how a device like this works can be seen here :
An explanation of spectrograms here :
When looking at visual content of the Trinity Church clip (download link), starting at 2 seconds into the video, the South Tower mechanical floors at levels 75 and 76, where there were no offices, violently explode outwards. This is particularly noticeable on the east face (right) face of the building as the whole line of floors pops out. Material can be seen ejecting from the south and north faces also in this clip. Estimating the distance of the camera to these floors at about 450 meters, we would expect the sound to take about 1.3 seconds to reach the camera, which in fact, it does.
The mechanical floors of the North and South towers (numbered 7-8, 41-42, 75-76, 108-109) had thicker concrete and steel floors and were supported by a much more robust construction than the normal office floors. They can be seen as darker bands on each tower's facade where there were vents rather than windows.
Thick steel I-beams were used instead of the criss-crossing floor trusses used in most of the towers' floors because of the need to house heavy equipment and engineering considerations of over-all building stability. The fact that these floors offered no noticeable resistance to the progressive collapse of the buildings remains unexplained. The evidence of the Trinity Church clip by itself would suggest that at least the 75th and 76th mechanical floors were destroyed by high-explosives. This possibility has been widely discussed in other articles which visually analyze the same explosion as seen from different camera angles. Opponents of the various "demolition theories" contest that the placement of a large number of explosives within the building could never go unnoticed by building tenants, however, since there were no offices or even windows in the mechanical floors, the undetected placement of a large amount of explosives would not present such an extreme logistical problem as is imagined.
**update** discussion of the authenticity of this clip's audio can be found on "this page" (closed b.o. very uncivil comments) since the audio portion has most certainly be "dramatized" for the Dolby 5.1 format from whence it came.
The first video is screen-marked "10:28am" (LT : which should be "9:58am", it's the South Tower collapse.! ) and is a very brief clip of the south tower collapse, recorded close-by from the south east next to Trinity Church. Though less than 5 seconds long, this clip offers fairly high quality audio, the most pronounced sound being that of 2 gigantic explosions. They are unmistakable and sound like 2 violent thunder claps.
In WTC 2, the core was damaged severely at the southeast corner and was restrained by the east and south walls via the hat truss and the floors. The steady burning fires on the east side of the building caused the floors on that side to sag. The floors pulled the heated east perimeter columns inward, reducing their capacity to support the building above.
A principal factor limiting the loss of life was that the buildings were only one-third to one-half occupied at the time of the attacks.
NIST estimated that if the towers had been fully occupied with 20,000 occupants each, it would have taken just over 3 hours to evacuate the buildings and about 14,000 people might have perished because the stairwell capacity would not have been sufficient to evacuate that many people in the available time. Egress capacity required by current building codes is determined by single floor calculations that are independent of building height and does not consider the time for full building evacuation.
Originally posted by LaBTop
History will prove who is on the right track,
In the mean time, I will ad more and more evidence