Prelude 9/11 morning Flight 11 hijacked Flight 175 hijacked WTC 1 hit Flight 77 hijacked WTC 2 hit Flight 93 hijacked Pentagon hit WTC 2 collapses Flight 93 crashes WTC 1 collapses WTC 7 collapses Epilogue


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Other technical articles

In addition to the official sources, a wide range of single technical articles have been published, covering various aspects of the terror attacks on September 11 2001.

Fire protection

Hvorfor kollapsede World Trade Center – og kunne det være undgået?,
Niels E. Andersen, Dansk Brand- og sikringsteknisk Institut

Brandbeskyttelse af bærende stålkonstruktioner,
Isover Saint Gobain


Aircraft Impact Damage (WTC 1 & 2),
Tomasz Wierzbicki, Professor of Applied Mechanics, MIT; Liang Xue, Ph.D. Candidate of Ocean Engineering, MIT; Meg Hendry-Brogan, Undergraduate student of Ocean Engineering, MIT

Static v. Dynamic Loading: Why the WTC Towers Fell So Fast,
Dave Burton

Energy Transfer in the WTC Collapse,
Frank R. Greening


Why Did the World Trade Center Collapse? – Simple Analysis,
Zdeněk P. Bažant, Yong Zhou

What Did and Did not Cause Collapse of WTC Twin Towers in New York,
Zdeněk P. Bažant, Jia-Liang Le, Frank R. Greening, David B. Benson

Mechanics of Progressive Collapse – Learning from World Trade Center and Building Demolitions,
Zdeněk P. Bažant, Mathieu Verdure

Single Point of Failure: How the Loss of One Column May Have Led to the Collaps of WTC 7,
Ramon Gilsanz, P.E., S.E., Willa Ng

Controlled demolitions

The World Trade Center Collapse, Questions & Answers,

A Critical Analysis of the Collapse of WTC Towers 1, 2 & 7 from an Explosives and Conventional Demolition Industry Viewpoint,


Why Did the World Trade Center Collapse? Science, Engineering, and Speculation,
Thomas W. Eagar, Christopher Musso,
The Minerals, Metals & Materials Society

The Role of Metallurgy in the NIST Investigation of the World Trade Center Towers Collapse,
S.W. Banovic, T. Foecke, W.E. Luecke, J.D. McColskey, C.N. McCowan, T.A. Siewert, F.W. Gayle,
The Minerals, Metals & Materials Society


Damage to buildings near World Trade Center Towers caused by falling debris and air pressure wave, not ground shaking, seismologists report,
Lamont-Doherty Earth Observatory
Columbia University, Palisades, New York

Other technical articles

When the Twin Towers Fell,
Steven Ashley,
Scientific American