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Why Fact-check? Why preserve a visual record?

The Website Written as a Book
Introduction
1: Science and Subjective Viewpoints
2: Toward Accurate Collapse Histories
....2.1: Progressive Floor Collapses in the WTC Towers
....2.2: General Global Characteristics of Collapses
....2.3: Mathematical Basis of ROOSD Propagation
....2.4: WTC1 Accurate Collapse History
....2.5: WTC2 Accurate Collapse History
....2.6: WTC7 Accurate Collapse History
3: WTC Collapse Misrepresentations
....3.1: Purpose of the NIST Reports
....3.2: NIST WTC1 Misrepresentations
....3.3: NIST WTC7 Misrepresentations
....3.4: NIST WTC2 Misrepresentations
....3.5: Reviewing the Purpose of NIST and FEMA Reports
....3.6: Bazant Misrepresentation of Collapse Progressions
....3.7: Block Misrepresentations of Collapse Progressions
....3.8: AE911T Misrepresentations of the Collapses
4: Scientific Institutions Can Be Unaware of Contradiction
5: Reassessing the Question of Demolition
....5.1: The Case of WTC1
....5.2: The Case of WTC2
....5.3: The Case of WTC7
6: WTC Collapse Records Studied as Meme Replication
....6.1: Meme Replication in Technical Literature
....6.2: Meme Replication in Mass Media
....6.3: Meme Replication in Popular Culture
....6.4: John Q Public and the WTC Collapse Records
Conclusions

WTC Twin Towers Collapse Dynamics

Official, Legal Attempts to Explain Collapses

Academic Attempts to Explain Collapses Reviewed

On the Limits of Science and Technology

WTC Video Record

WTC Photographic Record
WTC1 Attack to Collapse
WTC2 Attack to Collapse
WTC 7
.
-----PHOTO RECORD OF FIRE PROGRESSION-----
Fire Progression, WTC1 North Face
Fire Progression, WTC1 South Face
Fire Progression, WTC1 East Face
Fire Progression, WTC1 West Face
Fire Progression, WTC2 North Face
Fire Progression, WTC2 South Face
Fire Progression, WTC2 East Face
Fire Progression, WTC2 West Face
.
----DEBRIS LAYOUT AND CONDITION, BY REGION-----
Debris: WTC1 Around Footprint
Debris: WTC2 Around Footprint
Debris: From WTC1 Westward
Debris: From WTC1 Northward
Debris: From WTC2 Eastward
Debris: From WTC2 Southward
Debris: Plaza Area, Northeast Complex
Debris: Hilton Hotel, Southwest Complex
Debris: General, Unidentified Locations
Damage to Surrounding Buildings
Perimeter Column Photo Record
Perimeter Columns: Types of Damage
Core Box Columns: Types of Damage
Complete Photo Archive
Other Major 9-11 Photo Archives
The 911Dataset Project

WTC Structural Information

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Online Misrepresentations of the WTC Collapses

Forum, Blog Representations of the WTC Collapses

The Book Tested Through Experiments

Miscellaneous Notes, Resources
FAQ for Miscellaneous Notes
History Commons 9/11 Timeline
The 911Dataset Project
Skyscraper Safety Campaign
First and Largest 9/11 Conspiracy Theory
Key Words in Book and Website
Trapped Within a Narrowed False Choice
Vulnerability and Requestioning
On Memes and Memetics
Obedience, Conformity and Mental Structure
Denial, Avoidance (Taboo) and Mental Structure
Taboos Against Reviewing the Collapse Events
Extreme Situations and Mental Structure
Suggestibility, Hypnosis and Mental Structure
Awareness and Behavior
Magical, Religious, Scientific Cause-Effect Relations
The Extreme Limits of Mental Dysfunction
Orwell's "Crimestop", "Doublethink", "Blackwhite"
William James, Max Born: Science as Philosophy
Plato on Self Reflection and Mental Structure
Rewriting History, part 1
Rewriting History, part 2
On Smart Idiots

New Ideas in Education

Readdressing The Question of Demolition: WTC1

Readdressing The Question of Demolition: WTC1



REVIEW OF COLLAPSE FEATURES OF WTC1, WTC2, AND WTC7 WITH FOCUS ON THE QUALITIES OF CONFINEMENT AND REGULATION



5.1: THE CASE OF WTC1


Please recall the order of events leading up to and during the WTC1 collapse sequence from section 2.4:


1) Deformations: Inward bowing of the south face
2) Earliest detectable creep movement of the antenna and northwest corner
3) Appearance of ~87th fl S face ejections
4) Appearance of 95th fl W face ejection
5) Visible downward movement begins: Concave deformation of the roofline, antenna drops before north or west perimeter walls
6) Columns fail over tilt of less than 1 degree, appearance of 98th fl ejections and 105th floor ejections
7) Appearance of 77th fl W face ejections
8 ) Splitting of all perimeter walls: All visible upper parts fall out and over lower parts
9 ) Southward sliding of upper portion
10 ) Dis-integration of upper portion



What people see as the beginning of visible downward movement is marked blue.

The ejections marked red emerge before visible downward movement begins.




1) BEFORE THE VISIBLE COLLAPSE





9:02

Fire, Smoke Ejections as WTC2 is Struck






9:58, t-30 minutes, change of building structure (t=0 is the first moment of visible collapse)

Strong Fire Ejections As WTC2 Collapses






10:06, t-18 minutes, First deformations on south side reported

Inward Bowing of the S Perimeter


Inward bowing interpreted as partial core failure here


10:18, t-10 minutes, change of building structure

Ejections Witnessed at 10:18 simultaneously from floors 92, 95 and 98, from the north, west and south sides of building.


From the north:



From the west:




At higher elevations in each building the core columns segments were connected by using bolts and plates only with no welds. This information was very difficult to find. The core column-to-column connections were not staggered as they were along the perimeter. All 47 core columns had bolted column-to-column connections at the exact same elevation separated by 3 floors on floors 86, 89, 92, 95, 98, 102, 105. Detailed information on the connections is available at this link.




As shown in section 2.3, the NIST claimed numerous times within their reports that the first signs of failure of WTC1 was along the 98th floor and the building tilted 8 degrees to the south as columns progressively failed from south to north. In reality, the visual record shows the first ejections came from the south face around floor 87 and from the west face along floor 95.


Damage to Basement and Lobby
Roofline Smoke Pulses just before Collapse








10:28, 2) DETECTABLE CREEP MOTION BEGINS t-10 seconds, change of building structure

The first detectable sign collapse initiation was underway was an eastward and downward creep movement of the antenna along with eastward displacement of the upper northwest corner of the building.

Upper West Wall Pulls Inward 9.5s before Collapse
Antenna Base Shifts Eastward 9.5s before Collapse


The Sauret video is shown below. At 9.5 seconds before visible collapse the camera noticably shakes. This is when the slight movement of the antenna and northwest corner begin to be detected.





The Sauret video





The first 20 seconds are the original Sauret video.

Features:

1) The camera shakes about 9.5 seconds before collapse.
2) The antenna and the NW corner of the building begin to slowly move during or immediately after the camera shake.


Demonstration of subpixel tracking of a point on the antenna:



9 point tracking used to trace the movement of one round ball on the antenna.



Tracked points:




SOURCE VIDEO

http://xenomorph.s3.amazonaws.com/Etienne-Sauret-WTC1-DVD.mpg

Frame 1 in analysis = Frame 370 in the deinterlaced mpg.

Processing...

1) Deinterlace - unfold.
2) VideoEnhancer Resolution Upscale (*2x, *4y)
3) Deinterlace - fold.
4) Bob Doubler (Alternate Fields, No resize)


Only the first 1300 (interlaced), 2600 (deinterlaced) frames are examined.

Written out as .bmp, download yields 2600 files, totalling 10,782,860,400 bytes (10 Gb)


HORIZONTAL DISPLACEMENT, NW CORNER

http://femr2.ucoz.com/photo/6-0-426-3

Camera shake is obvious (between frames 1150-1250).

Black thick line is horizontal movement of the NW corner.

Grey is raw NW corner.

Blue is static point.

(Remember there would be a time delay between event and camera if indeed the source of shaking originated from WTC1)


STATIC POINTS

Two static points are used, one in the foreground (on the building on the left of frame), and one low on the East side of the building. The locations are shown in the following linked images:

The static feature fixed to WTC1...

http://femr2.ucoz.com/_ph/6/700962521.png


The foreground static feature...

http://femr2.ucoz.com/_ph/6/556859827.png


The following graph compares and shows the difference between both static points...

HiRes http://femr2.ucoz.com/photo/6-0-427-3



Blue is FG static point.

Grey is Building static point.

Black is the difference.

Note...

1) There is good correlation between both until near the very end of the trace, indicating that parralax effects are minimal between near and far field objects.

2) There is Westward movement of the static point on the building at the end of the trace.

3) Camera shake period should be obvious.


Static Feature Comparison (Vertical)

HiRes

Notes...

1) Slight gradual vertical drop of building static feature following camera shake.

I'm aware of stating movement of static features here, but I was expecting the traced point on the building to *stay* static.


Washer Horizontal Movement (Normalised to FG static point)...

HiRes http://femr2.ucoz.com/photo/6-0-431-3


Notes...

1) Camera shake is between 1150 and 1250.

2) Eastward movement follows shake.


Static Point Foreground Vertical...

HiRes http://femr2.ucoz.com/photo/6-0-432-3


NW Corner Raw Vertical...

HiRes http://femr2.ucoz.com/photo/6-0-433-3


Draft NW Corner Normalised Vertical...

HiRes http://femr2.ucoz.com/photo/6-0-434-3


http://the911forum.freeforums.org/enhanced-video-sources-t394.html#p11816



This motion was not noticed by the NIST.










3) APPEARANCE OF FIRST OVERPRESSURIZATIONS

At least 2 sets of overpressurizations were witnessed emerging before visible downward motion of the building.


87th Fl S Face Light Grey Ejection

The following analysis is taken frim this video clip. f# is frame number. Individual frames are shown and labeled below:


f755



f775



The following gif contains the 2 images above. There is an interval of 10 frames between each image (at 30 frames per second):





The frames within the gif are

f755 south side ejection from around floor 87 already visible
f765
f775 ejections appear around NW corner (green line) and along north and west faces of floor 98
f785
f795
f805

at 1/3rd second interval between images.




The ejection is located from the west view looking upward:









which means the ejection emerges from somewhere along the line shown:






The same ejection as seen from a second viewpoint from the south:







The ejections are located from the south view:










Therefore ejections extending as low as the 87th floor on the south face are visible before ejections appear along the north and west faces along the 98th floor.






Frames from overlays within this analysis are taken from this clip.


These ejections were not mentioned within the NIST report.







4) APPEARANCE OF 95th FLOOR WEST FACE OVERPRESSURIZATIONS

Earliest Ejections from fl 95, W Face, S Side








The appearance of the 95th floor ejections is marked by a green line at the beginning of the graph. The ejections occur well before downward movement of the antenna, northwest corner, or the fire on the upper southwest corner of the building.



The next short video clip demonstrates beyond doubt that overpressurizations from the 95th floor and the 92nd floor emerge before those along the 98th floor and before visible downward movement of the building. It is taken from the larger clip linked in phenomenon #3:


Only after the emergence of the 87th floor south face ejections and the 95th and 92nd floor west face ejections does visible downward movement of the building begin.


Neither of these ejections were mentioned within the NIST report











5) VISIBLE DOWNWARD MOVEMENT BEGINS: COLUMNS FAIL OVER TILT OF LESS THAN 1 DEGREE, APPEARANCE OF 98TH FLOOR EJECTIONS AND 105TH FLOOR EJECTIONS


Minimal Tilt: Less than 1 Degree before Falling


The columns fail from south to north and from east to west so the clearly visible NW corner would be the last columns to fail. The moment of failure is shown:



By synchronizing the video from the northeast, north, northwest and west views, one can determine the moment the northwest corner fails by visual inspection. It can be easily verified that the northwest corner had already failed in the frames shown below:




A more precise determination of tilt angle:

Any capable person can determine tilt angles from various perspectives over which all columns fail by using a simple 4 step process:


A) Verify the west face fails from south to north:

B) Verify the north face fails from east to west:

C) Determine precise moment of failure of the northwest corner:

D) Measure tilt of antenna and other normally vertical features of the deforming structure from multiple angles at that moment

Steps 1 and 2 allow one to verify that the northwest corner is the last set of columns to fail. The precise moment of failure of the northwest corner can be determined by using the high resolution Sauret video and tracking the movement of the northwest corner:

Larger size here.


The velocity curve in black allows the determination of the moment of failure of the NW corner with remarkable precision. One would naturally look at the point in which the velocity makes the initial sharp, downward transition. Both visual inspection and object tracking allow anyone to spot the moments of failure of the NW corner.

By synchronizing videos from other perspectives with the Sauret video from the north, tilt angles can be determined from each perspective.





Tilt angle over the initial column failure shown as a 3 image gif here




which represents 0:21 in the synchronized video:





These two images show the true state of tilt just after the moment that the last columns failed on the NW corner of the building. In the lower picture the NW corner has already failed at fl 98. The break on the corner is already visible so this image is a conservative estimate of true tilt. Precise measurements actually yield less tilt than is shown in the images. More precise measurements are available here:

Minimal Tilt: Less than 1 Degree before Falling


The NIST did not notice this movement. All NIST descriptions of the initial WTC1 movement were reproduced in section 2.3




105th floor ejection








6) 77TH FLOOR OVERPRESSURIZATIONS APPEAR





This is the moment the 77th floor ejection first appears:








7) SPLITTING OF THE PERIMETER WALLS: ALL VISIBLE PERIMETER WALLS FAIL OUTWARD AND OVER THE LOWER PORTIONS



South Wall Motion visual reconstruction verifies the upper portion of the south wall fell out and over the lower portion.




North Wall Motion shows the same behavior; the upper portion fell out and over the lower portion




West Wall Motion visual reconstruction verifies the upper portion fell out and over the lower portion. The upper portion is the large falling object seen in this image:




Motion of the northeast corner and the surrounding area is mapped:

NE Corner: Upper Assembly Snaps Over Lower Portion



Tracking the drop motion of 3 corners of the building: Both N and W Perimeter Walls Fail Within 0.5s Interval











8) SOUTHWARD SLIDING OF THE UPPER PORTION

NE NBC viewpoint: Measurements of large antenna movement,

Angular movement of large antenna from NE, measured by tracking the horizontal difference between 2 points on the antenna






Larger version: here


Evolution of angular movement from NE viewpoint visualized (angle exaggerated)



Between frames 165 and 217, the antenna tilted faster and reached about 0.75°. After frame 217, the tilting of the antenna stopped increasing for the next 40 frames. During that time the antenna merely shifted southward while the north face (upper floors) apparently tilted a bit more.

In the GIF above the x component of the movement is extremely stretched. Both axis are numbered each in 10000 units. A thin blue line shows the position 10 frames in the future and a thin yellow line shows the position 10 frames in the past. The thin horizontal green lines show the measured antenna section. The vertical lines are extended to see at which elevation the "antenna" collectively pivots (floor 98 is about at y=70000). It is obvious that the antenna started to descend at virtually 0° tilting. At about 0.6° tilting the north face gave way and stopped tilting further for the next 40 frames.


The same motion seen from the west:







Within these observations are multiple indications of collective core failure. Not one of these observations is recognized within the NIST reports. The author could understand that the official reports could overlook an observation or two, but consider the multiple indications of collective core failure:
  • Early antenna movement
  • Pull in of the NW corner
  • The upper portion of the south, west and north walls fail outside and over the lower portion
  • The actual measurement of tilt as the NW corner visibly fails
  • The upper portion detaches from the lower portion and slides southward at less than 1 degree tilt
Multiple indicators of the same behavior, none of which are mentioned within the NIST report.











9) DIS-INTEGRATION OF THE UPPER PORTION







Zooms of these images reveal the upper south wall and a large section of the antenna have fallen out and over the lower south wall, shown here.




Antenna falls outside of footprint southward




There is no need to speculate about these events since they are directly observable and captured in video and photographs, and therefore verifiable.

Of all the observations and measurements listed, only the fire flair-up from the east side of the building 3 seconds before collapse is mentioned within the NIST reports.













COLLAPSE PROGRESSION REVISITED: ORDERED DECONSTRUCTION (DECOMPOSITION) OF THE LOWER PORTION

"Mathematics is patterns". -Richard Feynman


WTC Twin Towers collapse progression was already described in section

2.1: Progressive Floor Collapses in the WTC Towers


COLLAPSE PROGRESSION FRONTS are discussed further in section 3.3.







Further collapse progression activity



EJECTION PATTERNS BELOW THE COLLAPSE FRONTS


Ejections Below Collapse Fronts


A composite image of supposedly random ejections seems to show a repeating pattern



This pattern was extracted from the motion shown here:






BASEMENT ACTIVITY




Damage to Basement and Lobby





ORDERED DECOMPOSITION OF THE PERIMETER WALLS

Recorded Motion of the Perimeter Walls





Fig _ Each perimeter wall can be divided into 3 regions separated by reinforced MER spandrels. The colored sections in the graphics show portions of each wall that are trackable and identifiable. The colored portions are the areas of each wall that can be tracked and has a known path of movement.


Large sections of each perimeter wall were able to be tracked by reconstructing the collapses of each wall from the visual record.





Fig _ The collapse progression down the south region was well ahead of that of the north region. So along the west and east walls collapse progression proceeds down different regions at different rates. Image on right shows identifiable sections of the WTC1 west perimeter.



The movement of all 4 walls are mapped at these links:

South Wall

West Wall

North Wall

East Wall







ORDERED DECOMPOSITION OF THE CORE






Visible behavior of the core is reconstructed and the surviving columns identified in these links:


Entire E-W Width of the Core Survives Initial Collapse







RUBBLE DISTRIBUTION

Rubble Layout and Column Conditions Recorded







The perimeter is most probably responding to partial core failure. Therefore, the actual mechanism of collapse seems to be partial core failure leading to collective core failure, while the perimeter deformations are merely the response to core failure.

Created on 09/19/2012 08:47 AM by admin
Updated on 05/15/2015 11:37 PM by admin
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