Protec Inc. for 30 years has documented Vibration Prediction, Monitoring, and Structure Inspections, and is an independent authority on explosive demolition. Protec was operating seismographs in Manhattan and Brooklyn at the time of the 9/11 attacks. For several weeks after 9/11 Protec inspectors and photographers documented the deconstuction and debris removal at the site.
Among their conclusions:
ASSERTION
"But explosive charges (aka plumes, squibs, etc.) can clearly be seen shooting from several floors just prior to collapse."
PROTEC COMMENT: No, air and debris can be seen pushing violently outward,which is a natural and predictable effect of rapid structural collapse. Human-inhabited buildings are typically comprised of about 70% air and 30% structural elements and contents. During any rapid collapse that air must be displaced in some manner. Therefore when gravity makes a structure fall downward, the air within the structure is propelled horizontally through windows, doorframes, or any other path of
least resistance.
ASSERTION
"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...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. Fortunately, several seismographs were recording ground vibration that morning, and perhaps more fortunately, all available data is consistent and appears to paint a clear picture.
Seismographs at Columbia University's Lamont-Doherty Earth Observatory in Palisades, New York, recorded the collapses of WTC 1, 2 and 7. This data was later released to the public and currently appears on their website.
Additionally, on 9/11 Protec field technicians were utilizing portable field seismographs to continuously record ground vibrations on several construction sites in Manhattan and Brooklyn for liability purposes.
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."
Among their conclusions:
ASSERTION
"But explosive charges (aka plumes, squibs, etc.) can clearly be seen shooting from several floors just prior to collapse."
PROTEC COMMENT: No, air and debris can be seen pushing violently outward,which is a natural and predictable effect of rapid structural collapse. Human-inhabited buildings are typically comprised of about 70% air and 30% structural elements and contents. During any rapid collapse that air must be displaced in some manner. Therefore when gravity makes a structure fall downward, the air within the structure is propelled horizontally through windows, doorframes, or any other path of
least resistance.
ASSERTION
"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...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. Fortunately, several seismographs were recording ground vibration that morning, and perhaps more fortunately, all available data is consistent and appears to paint a clear picture.
Seismographs at Columbia University's Lamont-Doherty Earth Observatory in Palisades, New York, recorded the collapses of WTC 1, 2 and 7. This data was later released to the public and currently appears on their website.
Additionally, on 9/11 Protec field technicians were utilizing portable field seismographs to continuously record ground vibrations on several construction sites in Manhattan and Brooklyn for liability purposes.
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."
