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Noun: causal agent
Any entity that produces an effect or is responsible for events or results.
Figure 1-7 Schematic depiction of areas of collapse debris impact, based on aerial photographs and documented damage. Striped areas indicate predominant locations of exterior steel columns. Inner circles indicate approximate radius of exterior steel columns and other heavy debris. Outer circles indicate approximate radius of aluminum cladding and other lighter debris. Heavy Xs show where exterior steel columns were found outside the predominate debris areas.
Debris from the collapsing towers, some of it still on fire, rained down on surrounding buildings, causing structural damage and starting new fires (Figure 1-7). The sudden collapse of each tower sent out air pressure waves that spread dust clouds of building materials in all directions for many blocks. The density and pressure of the dust clouds were strong enough to carry light debris and lift or move small vehicles and break windows in adjacent buildings for several blocks around the WTC site. Most of the fires went unattended as efforts were devoted to rescuing those trapped in the collapsed towers. The 22-story Marriott World Trade Center Hotel (WTC 3) was hit by a substantial amount of debris during both tower collapses. Portions of WTC 3 were severely damaged by debris from each tower collapse, but progressive collapse of the building did not occur. However, little of WTC 3 remained standing after the collapse of WTC 1. WTC 4, 5, and 6 had floor contents and furnishings burn completely and suffered significant partial collapses from debris impacts and from fire damage to their structural frames. WTC 7, a 47-story building that was part of the WTC complex, burned unattended for 7 hours before collapsing at 5:20 p.m. The falling debris also damaged water mains around the WTC site at the following locations:
- 20-inch main on West Street, closed to the slurry wall, about midway between Vesey Street and Liberty Street
- 20-inch main along the Financial Center north of the South Link Bridge
- 20-inch main at the corner of Liberty Street and West Street
- main in front of the West Street entrance to 90 West
- 24-inch main on Vesey Street, near West Street
main at the corner of Vesey Street and West Broadway, near the subway station
main at the southwest edge of 30 West Broadway
- 16-inch main inside the slurry wall
Damaged mains were located after the collapses, but access was impeded by the collapse debris. The timeline of the major events is summarized in Table 1.1. The times and seismic data were recorded at the Lamont-Doherty Earth Observatory (LDEO) of Columbia University. The signal duration and Richter Scale magnitudes were included to indicate the relative magnitudes of energy transmitted through the ground between the events. Figure 1-8 shows the accelograms recorded by the observatory during the events.
Originally posted by Watcher-In-The-Shadows
reply to post by jprophet420
Here, you can see WTC7 being well with the confines of being hit by debris:
[atsimg]http://files.abovetopsecret.com/images/member/f0534cd485c5.jpg[/atsimg]
Originally posted by Watcher-In-The-Shadows
reply to post by billybob
When did I bring up the NIST?
Or even better yet, what does the NIST have to do with what I was saying except it's on the same subject and has something to say about the collapse?
Originally posted by Watcher-In-The-Shadows
reply to post by bsbray11
Or perhaps I am not using the NIST as a measuring stick for my theories on 9/11. Just because it exists does not mean I have to refer to it.
It's funny that seems to be the popular assumption despite the fact I only mention it in the capacity that I did in the post you are responding to.