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NIST issued its final report on the collapse of the World Trade Center's twin towers in September 2005, and the agency issued its final report on 7 World Trade Center in November 2008. NIST concluded that the collapse of each tower resulted from the combined effects of airplane impact damage, widespread fireproofing dislodgment, and the fires ...
From collapse timing measurements taken from a video of the north face of the building, NIST observed that the building's exterior facade fell at free fall acceleration through a distance of approximately 8 stories (32 meters, or 105 feet), noting "the collapse time was approximately 40 percent longer than that of free fall for the first 18 ...
Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1) (PDF) (Report). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST). Stern, Robert A. M.; Mellins, Thomas; Fishman, David (1995).
This initiated the progressive collapse of the entire building at 5:21:10 pm, according to FEMA, [1]: 23 while the 2008 NIST study placed the final collapse time at 5:20:52 pm. [2]: 19, 21, 50–51 The collapse made the old 7 World Trade Center the first steel skyscraper known to have collapsed primarily due to uncontrolled fires.
Heavily damaged by debris from the collapse of 1 and 2 World Trade Center 0 Did not collapse, but was declared destroyed. [8] 6 World Trade Center: Lower Manhattan, New York City 1974 Demolished Heavily damaged by debris from the collapse of 1 World Trade Center, was demolished in late 2001 Unknown Did not collapse, but was declared destroyed. [9]
The 9/11 Commission Report at 9-11commission.gov (7.2 MB PDF) The 9/11 Commission Report public domain audiobook at LibriVox; XHTML version of the full 9/11 Commission Report (hand-converted XHTML format) Video of 9/11 events (split screen) supplemented with text from Commission Report findings
Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Tower (NIST NCSTAR 1) (PDF) (Report). Federal Building and Fire Safety Investigation of the World Trade Center Disaster. National Institute of Standards and Technology (NIST). Stern, Robert A. M.; Mellins, Thomas; Fishman, David (1995).
U.S. President Bush speaks with New York governor George Pataki and New York City mayor Rudy Giuliani two days following the September 11 attacks, on September 13, 2001. After the September 11, 2001 attacks, the United States government responded by commencing immediate rescue operations at the World Trade Center site, grounding civilian aircraft, and beginning a long-term response that ...