Written by Adam Taylor
28 September, 2012
Architects and Engineers for 9/11 Truth

Editor’s note: This is Part 6 (see Part 5) of an extensive report by 9/11 researcher Adam Taylor that exposes the fallacies and flaws in the arguments made by the editors of Popular Mechanics (PM) in the latest edition of Debunking 9/11 Myths. We encourage you to submit your own reviews of the book at Amazon.com and other places where it is sold.

The final section of PM’s chapter on the Twin Towers addresses a theory that is not widely believed among members of the 9/11 Truth movement: that large seismic spikes indicative of explosions occurred before the Towers collapsed. As PM explains:

Seismographs pick up readings from large events like earthquakes, but according to seismologists, explosions from a controlled demolition would not register

On www.whatreallyhappened.com, the Web site references a graph showing the readings over a 30-minute span. Measured over such a long time period, the collapses do appear as sudden, momentary spikes. But when shown on a more detailed graph covering a 40-second span, it is clear there was sustained seismic activity for the duration of the collapses. (pg. 62)

PM’s assessment corroborates the findings of the Lamont-Boherty Earth Observatory at Columbia University.[i] However, the point that there was not just one sudden seismic spike at Ground Zero has been noted by other supporters of the 9/11 Truth movement as well.[ii]

In refuting a claim made by very few members of the movement, PM also refutes an argument that several other defenders of the official 9/11 story have made: that any explosives used on 9/11 would have been detected by seismographs. As PM writes (quoting seismologist Arthur Lerner-Lam):

“Demolitions are typically very small explosions,” Lerner-Lam says. “And, you wouldn’t record them anyway because they’d typically be aboveground, and too small to observe.” (pg. 63)

This admission in PM’s book is noteworthy, as several “debunkers” have in fact argued that the absence of seismic spikes indicates that the Towers were not demolished with explosives.

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