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Why Fact-check? Why preserve a visual record?

The Website Written as a Book
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

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
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: 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

Log In


Remember Me

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

All 60+ columns in N and W faces fail within 0.5s

All 60+ columns in N and W faces fail within 0.5s

The best place to see whether a southward tilt of the upper portion occurred before total column failure is along the east or west walls. If the upper portions are collectively tilting southward, you should see confirmation of the tilt in the east or west walls.

Drop curves of NW and SW perimeter anchor points compared:

The motion of two track points at opposite ends of the west wall are compared in the plots shown. The SW corner 104th floor fire and the NW corners are tracked and plotted using the NBC NW viewpoint, courtesy of femr:

Measurement of the large antenna, SW corner fire and NW corner washer drops from the NW NBC viewpoint

(notes: Black - Antenna
Red - Washer
Purple - SW Fire

59.94 fps - Resolution Doubled. 1 pixel on the graph is 0.5 pixels on the original video.)

NW NBC viewpoint original file:

Youtube clip of same video, lower quality, later start point:

Using this drop data we can see that the SW corner of the west perimeter wall was released within 0.5 seconds of the NW corner.

The of the NW and SW corner motion differs by only 14 frames. This means that all 60+ columns along the west wall failed within a 0.25 second interval. To be conservative, this interval is considered to be within 0.5 seconds.

Visual confirmation of 0.5s interval between NW corner and SW corner release events

We can verify whether an interval 0.5 seconds or less makes sense by just looking at how little a delay between the NW corner and SW corner downward movement in the following clip:

Notice how the large fire located close to the SW corner moves downward just before the NW corner is seen to move. Even a rough visual inspection shows less than a 1 second delay between downward movement of the 2 corners.

Ejections before movement or movement before ejections? Appearance vs reality.

Shows the rapid south to north emergence of the original forceful row of 98th fl ejections. The new drop curves from 4 key anchor points along the building show that the row of ejections emerged before any mearurable point on the outside of the building began go into falling.
High res video of the event

A couple more west views:
(Note 98 corner behaviour on opposite ends of the face about 0:09) (may be of interest) (Good for East to west progression)


The start point of the earliest ejections seems actually a few floors below the more pronounced traversal. Watch the south corner at the start of the short segment above carefully by following the red arrow.
Also, vertical movement of the NW corner is present before the smoke reaches the N corner.

When the behaviour of the smoke a couple of floors down is observed, a traversal in the opposite direction N to S is seen before traversal upwards and diagonally northwards, followed by the more prominent S to N traversal along a single floor.

An interesting behaviour. From core to South face, then back along the whole face

1) These numbers seem to show there were ejections before movement.


2) The ejections along the west face are the result of two slabs coming together, the south side falling only about 8 ft and the north side not moving at all?

In short, the ejections do not seem to match the slab movement. If their intensity and timing cannot be explained by slab movement.....

Then it is proof for rapid pressurization which the slab movement of natural collapse cannot account for.

How can two slabs account for the initial ejections if the south side of the moving slab has only fallen about 8 feet and the north side has not moved at all at the moment the hinge breaks?

Since the roofline of the building is shaped as a square, by tracking 3 of the 4 corners tilting, hinging and collective column failure can be quantified and understood. Synchronized video from the north (Sauret) and from the NW (NBC NW view) allows us to estimate the tilt orientation and the horizontal failure propagation rate. The objects and points shown in the 2 views below are tracked and plotted to achieve this

Points tracked near the NE and NW corners in the Sauret video at 59.97 frames per second.:

Drop curves of the tracked points, courtesy of Achimspok:



The NE corner started to descent in frame 211. The velocity curve kinks down in 209 because of symmetrical averaging. The roof line reaches a tilt angle of about 0.25° in frame 235.

The faster east tilt of the antenna started in frame 185. Once again, if the core was pulled east by a perimeter collapse of the 98 SE corner we may expect between frame 185 and 211 twice the east angle of the antenna at the south face and both south corners. The fire at 104 SW corner should move 0.2 meters towards east but...
...the x-component of the 104 fire shows no motion at all (eastward motion = downwards slope of the curve). May be the top tilted towards south at the very same time and nullified the x-component. If so then we should see at least a downwards motion of the fire between 185 and 210 but...
...the y-component of the 104 fire apparently moved downwards after frame 210 and may be between 145 and 185. Between 185 and 210 all 19 curves show an upwards tendency (flame up due to core collapse?).
If the perimeter forced the core to tilt then it appears to be impossible that the perimeter stopped to tilt right when the core started to tilt and vice versa. Hence, there is no detectable perimeter driven cause for the east tilt of the antenna.

The velocities of the corners are included in the graph. As I mentioned earlier, probably the best way to locate a release point is to look at the positional and velocity data together. The release point is when there is a drastic change in the velocity slope. We can see that the release point for the NE corner is about frame 208 and for the NW corner it is about frame 222.

There is only about 14 frames between the NE and NW corner release points. That is less than 0.3 seconds.

(source video:

achimspok Sauret version: starts some seconds prior to the shaking camera.

File specs:
97.730.578 bytes
Audio: Dolby AC3 48000Hz 6ch 224Kbps [AC-3]
Video: MPEG2 Video 720x480 (16:9) 29.97fps 9608Kbps [Video]
duration: 02:04,124

Video fields unfolded into frames to get 7440 frames at 59.94fps. Only a segment is used. Frame 2005 of the unfolded version is the first frame "000".

Here is a link to the original file:


Next, the SW corner 104th floor fire and the NW corners are tracked and plotted using the NBC NW viewpoint, courtesy of femr:

Measurement of the large antenna, SW corner fire and NW corner washer drops from the NW NBC viewpoint

(notes: Black - Antenna
Red - Washer
Purple - SW Fire

59.94 fps - Resolution Doubled. 1 pixel on the graph is 0.5 pixels on the original video.)

NW NBC viewpoint original file:

Youtube clip of the same view, lower quality:


Using this drop data from the first time in 911 research we can see that the SW corner of the west perimeter wall was released within 0.5 seconds of the NW corner.

From the data we can roughly determine that when the 3 corners are compared........

The SW corner was released first
The NE corner was released about 0.2 seconds later
The NW corner was released about 0.3 seconds after that.

3 of the 4 corners of the building are released within a 0.5 second interval.

Perimeter failure along a straight horizontal line
After the split the upper portion fails out over the lower portion as at least 3 large chunks as shown in the link

The largest piece seems cut along a straight line on it's bottom edge as shown at the link

This same pattern is repeated as the NE corner assembly also pops out and seems broken along a straight line on it's lower edge

In both cases the straight line along the bottom of the piece is the initial failure line.

Created on 10/15/2010 08:40 AM by admin
Updated on 08/04/2013 09:01 PM by admin
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