The collapses of the World Trade Center north tower (WTC1) and south tower (WTC2), struck by terrorist attacks on 11 September 2001, produced ground tremors discernable at nearby seismic stations (Kim et al., 2001) and, as will be shown, other stations throughout the northeastern United States. Although seismic signals produced by building collapses are not unusual (Holzer et al., 1996), the mass of the falling World Trade Center (WTC) towers and traumatic circumstances were extraordinary. This study determined the collapse durations of the towers with unique precision from the precise timing of seismic station...

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