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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

Accurate Collapse History of WTC 2

Accurate Collapse History of WTC 2





2.5 TOWARD AN ACCURATE TECHNICAL HISTORY OF THE WTC2 COLLAPSE



WTC2 BUILDING MOVEMENT: INDEPENDENT MAPPING AND MEASUREMENTS OF THE EARLIEST DETECTABLE MOVEMENT THROUGH THE COLLAPSE INITIATION SEQUENCE


The collective visual record of the WTC2 collapse is examined directly and independently of all other sources, groups or individuals. The movement of the structure during the initial column failure sequence is mapped and traced back to the earliest point of detectable movement from multiple angles. Features of the initial failure sequence can be understood as a rapid succession of 8 identifiable events occurring in the following order:



Action above the 75th floor:

1) Deformations: Inward bowing of the east face
2) Earliest detectable movement: 81, 82nd fl spandrels pull in sharply (along east and north walls)......................
3) Earliest ejections, 78th fl ejections: .....................
4) East wall separates into upper and lower parts, East wall upper portion is pulled inward and behind the lower portion
5) Tilting begins
Flash and destruction of NE corner, floor 90
Failure sequence of the north and south perimeter walls over tilt of __ degrees

Action along the 75th floor:

6) 75th fl east face row of ejections
7) 75th fl west wall north and south quarter of MER panels ejected from building with flooring still attached. NW and SW MER corners are destroyed, west wall upper portion falls out and over lower portion.
8) Dropping of the upper portion.



All claims are verifiable and all methods reproducible.







1) EARLIEST DEFORMATIONS: INWARD BOWING ON EAST FACE

Inward Bowing of East Perimeter




Like WTC1, inward bowing was observed on the perimeter wall connected to long span floor trusses. In the case of WTC1, inward bowing on the south face led to collective core collapse at a tilt angle of less than 1 degree about 20 minutes after it was first observed. The actual tilt angle was grossly exaggerated within the NIST reports (shown in section 3.4), and upon this gross exaggeration the NIST concluded that south wall failure triggered collective core failure over a tilt of at least 8 degrees. If one uses correct observations and measurements as opposed to the grossly misrepresented ones offered by the NIST, it is natural to suspect that the south wall failure was a reaction to core failure rather than the other way around.









2) EARLIEST VISIBLE MOVEMENT: 81, 82nd fl spandrels pull in sharply (along green and blue lines)



The first visible movement leading into the collapse initiation sequence is that of the green and blue lines pulling inward and down sharply.

After that, 7 distinct ejections form along the 78th floor (marked by red ovals).

This is quickly followed by the east face breaking along the staggered purple line into upper and lower sections. The 2 yellow panels remain attached to the lower section (phenomenon #4).



All 3 actions are shown in the following video, occurring in rapid succession:






At the same time the green lines along the east wall are being pulled in sharply, a portion of the north wall is also being pulled inward as shown:





As will be shown in section 3.4, the NIST does not mention within their reports or seem to notice how the the north wall is pulled in along with the east wall. Just as in the case of WTC1 and WTC7, the motion indicates that the perimeter seems to be responding to failure within the core rather than the other way around.

In all 3 collapsed buildings, the NIST does not acknowledge that the perimeter deformation appears to be a response to partial or collective core action (shown in part 3).







3) EARLIEST OVERPRESSURIZATION:

E Face Pressurized Pulse Just Before Initiation

Which is followed by the group of 78th fl ejections.....................

First E Face Ejections Along 78th and 75 Fl Slabs
78th fl E Face Ejections in Detail

This group of ejections along the 78th floor, east face, appears at 7 distinct locations symmetrical about the center of the east face.







4) Splitting of east face:

East Perimeter Snaps Cleanly Along Bolt Seams


The line of division between upper and lower wall is identifiable to individual bolted connections.




A still image from the animated gif reveals the break pattern:




This is the exact outline of the upper edge of the east wall falling outward:



Larger version here


This break pattern is the same as the purple staggered line shown in item #2 (earliest detectable motion), with the addition of 2 perimeter panels, shown as the off-colored panels in this illustration and shown as yellow panels in item #2.








5) TILT BEGINS: DETERMINATION OF TILT OVER WHICH ALL COLUMNS INITIALLY FAIL:


Lateral displacement of lower portion during tilt





The lateral displacement of the lower portion plotted:



A stretched plot of the same motion:



Note that the displacement increases to a maximum, and then flattens out for a short time before returning. The end of the flat period occurs at frame 6873 on the graph. The building position at that moment is shown below:





The complete action through the portion of tilting in which the lower part of the building is being pushed outward to the west is shown:






This is the complete tilting motion which the building undergoes before the upper and lower portions become severed from one another.







Flash and destruction of NE corner, floor 90



Splitting of north face during tilting:

Pressure Punches along N Face as Building Tilts






The wet side of the north wall splitting:






Splitting of the south face:

South Wall Motion









Action through the 75th floor, stages 6 and 7:


6) 75th FL EAST FACE ROW OF EJECTIONS AND SEPARATION OF UPPER AND LOWER PORTIONS:


78th and 75th Rows of Ejections Sharply Discontinuous



4 distinct moments of building behaior are shown in the following gif:






Image 1 shows the moment the 78th fl row of ejections first become noticable.

Image 2 shows the moment just before the forceful 75th row ejections emerge. This is also the moment in which the upper and lower become completely severed from one another.

Image 3 shows the moment when the 75th fl ejection patterns become distinctly noticable

Image 4 shows the process of further downward movement.



Image 4 also marks the moment just before the west beam flooring from the mechanical equipment room (MER) levels will be propelled westward out of the building and the MER corner pieces will be ripped outward. The process is mapped in the next item.









7) SPLITTING OF THE WEST FACE:

Early West Face Ejections Above and Below MER Panels
W MER Perimeter w/Beam Flooring Ejected from Building



WEST WALL MER PANELS EJECTED WITH BEAM FLOORING ATTACHED


Just after the 75th floor east face row of ejections became visible in image 4 above, large sheets of flooring constructed of beams were ejected from the west side of the building with MER perimeter columns still attached. The location of one of the interconnected sections of MER perimeter columns with beam flooring is shown as a yellow and red plane in the graphic below:





The sheet of flooring was attached to core columns at the location marked by a red oval. The sections that were ejected with beam flooring still attached are shown as red and blue rectangles. They fell along the trajectories shown and landed in the positions indicated:




The green MER panel also fell according to the trajectory shown. The following video clips show the emergence of panel marked in red:





A slow motion version played forward and backward to show from where the panel emerges:




A still image extracted from the video shows the pieces marked in red and green falling:





A high resolution camera from another angle captures details of the MER perimeter pieces marked in red and blue leading other falling objects:





A bit later in the trajectory the same camera shows the falling MER perimeter sections in greater detail. Note the rectangular section of beam flooring still attached to the piece following the blue trajectory:





The edges of the flooring marked correspond to the sections of beam flooring marked in the following graphic. The graphic shows how beams are placed to support heavy equipment on the 75th floor (MER level):




The following link shows details of the upper and lower edges of each MER perimeter panel:

75-78th Fl W MER Panels Ripped along Failure Lines










8) DROPPING OF THE UPPER PORTION:


The upper portion falls completely behind the lower east perimeter wall and thrusts the lower wall outward:






The whole sequence described is visible. The ejection pattern along gthe east face is distinguishable as

Discontinuous and distinct row of 78th floor ejections
Discontinuous and distinct row of 75th floor ejections
Continuous flow of floor-by-floor ejection flow downward after the distinct and discontinuous row of 75th floor ejections.

The upper section breaks the final connections coupling it to the lower section just before the distinct row of 75th floor ejections emerges. It then falls downward behind the lower east wall, thrusting the intact lower wall out as a result as seen.



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












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



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 2.2.





Further visible collapse progression activity


BASEMENT ACTIVITY




Damage to Basement and Lobby







EJECTION PATTERNS BELOW COLLAPSE FRONTS


Ejections From Below WTC2 Collapse Front

Mechanical Floor Ejections







ORDERED DECOMPOSITION OF THE PERIMETER WALLS

Recorded Motion of the Perimeter Walls










East Wall

West Wall

South Wall

North Wall Motion








ORDERED DECOMPOSITION OF THE CORE


Details of the core sections that temporarily survived the collapse viewed from the northeast.




The images available at this link allow the interconnected columns to be identified with certainty










RUBBLE DISTRIBUTION


RUBBLE LAYOUT

The debris for each building was found within and near the footprints and was pushed, or fanned outwards from the 4 exterior walls.

If WTC7 is ignored and only debris from WTC1 and 2 is considered, all debris exists in 8 natural regions as shown below.



Southward from WTC1 and westward from WTC2 share a region (called it "southwest complex") and eastward from WTC1 and northward from WTC2 share a region (the plaza area). Hence 8 natural regions total.

It is hoped that by rearranging all known useful debris photos by region, the reader can see for themselves how debris was distributed throughout the complex and in what condition without being overwhelmed with information.


The largest publicly available collection of debris photos are linked below:

Debris: WTC1 Around Footprint at here

Debris: WTC2 Around Footprint at here

Debris: From WTC1 Westward at here

Debris: From WTC1 Northward at here

Debris: From WTC2 Eastward at here

Debris: From WTC2 Southward at here

Debris: Plaza Area, Northeast Complex at here

Debris: Hilton Hotel, Southwest Complex at here









WTC1 and 2: Differences and Similarities

Just as with WTC1, WTC2 experienced inward bowing of the perimeter leading up to collapse. The reason given for this, according to the NIST, is that the perimeter was pulled inward due to sagging long span floor trusses. As with WTC1, vital clues are overlooked within the NIST reports that are extractable directly from the visual record.


Anyone can look at the splitting of the perimeter walls of each building to clearly see that WTC1 behaves quite differently than WTC2.









WTC 2: Observed Features of the Collapse Process


----------BEFORE THE COLLAPSE---------
Inward Bowing of East Perimeter
Pressure Bursts from E Face, Fls 77 and 80
Molten Substance Seen Falling from near NW Corner
E Face Pressurized Pulse Just Before Initiation
.
------COLLAPSE INITIATION MODEL---------
Rapid Pull-in of E and N 81, 82nd Fl Spandrels
78th and 75th Rows of Ejections Sharply Discontinuous
78th fl E Face Ejections in Detail
East Perimeter Snaps Cleanly Along Bolt Seams
Pressure Punches along N Face as Building Tilts
Earliest West Face Ejections
Lateral Displacement of Lower Portion
W MER Perimeter w/Beam Flooring Ejected from Building
75-78th Fl W MER Panels Ripped along Failure Lines
Flash and Destruction of NE Corner, Fl 90
N Corner Remains Standing
.
-----COLLAPSE PROGRESSION MODEL-----
East Wall Motion
West Wall Motion
South Wall Motion
North Wall Motion
Ejections Below WTC2 Collapse Fronts
Ejections at Mechanical Floors
Portion of Core Survives Initial Collapse
Rubble Layout and Column Conditions Recorded








Return to part 2.6: WTC7 Accurate Collapse History

Created on 04/16/2012 01:52 AM by admin
Updated on 08/02/2015 05:38 PM by admin
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