From Brent Blanchard,*
Senior Editor for Implosionworld.com and Director of Field Operations at Protec Documentation Services, Inc.*
A Critical Analysis Of The Collapse Of WTC Towers 1, 2 & 7 From An Explosives And Conventional Demolition Industry Viewpoint*
Originally Posted by*Brent Blanchard
“ASSERTION #4
“Several credible eyewitnesses are adamant that they heard explosions in or near the towers.”
PROTEC COMMENT: Maybe they did hear loud noises that sounded to them like explosions, but such statements do nothing to refute scientific evidence that explosives were not used.
Arguing over who heard explosion-like noises, when they heard them, how loud they were or from what direction they came is a pointless exercise…
Simply put, there are countless causes of sharp, loud noises that have no relation to explosives. The only scientifically legitimate way to ascertain if explosives were used is to cross reference the fundamental characteristics of an explosive detonation with independent ground vibration data recorded near Ground Zero on 9/11.
Protec technicians were operating portable field seismographs at several construction sites in Manhattan on 9/11. These seismographs recorded the events at Ground Zero, including the collapse of all three structures. These measurements, combined with seismic and airblast data recorded by other independent entities, provide an unfiltered, purely scientific view of each event.
In all cases where seismographs detected the collapses, waveform readings indicate a single, gradually ascending and descending level of ground vibration during the event. At no point during 9/11 were sudden or independent vibration “spikes” documented by any seismograph, and we are unaware of any entity possessing such data.
This evidence makes a compelling argument against explosive demolition. The laws of physics dictate that any detonation powerful enough to defeat steel columns would have transferred excess energy through those same columns into the ground, and would certainly have been detected by at least one of the monitors that were sensitive enough to record the structural collapses. However, a detailed analysis of all available data reveals no presence of any unusual or abnormal vibration events."
In other words, “there were NO explosives used on any components of those towers”.