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Seismic signals were recorded on September 11 2001 during the period when the North and South Towers (respectively WTC1 and WTC2) were penetrated and collapsed, as well as during the collapse of Building 7 of the WTC (also known as WTC7), a building which had not been hit by a plane.
Seismologists are puzzled in their analysis of signals recorded at this time, as the contradictions are significant. They are particularly intrigued by the presence of seismic "peaks" before the collapses (see figure 4). This text focuses on the study of seismic signals and aims to demonstrate that consistency only appears once we leave the official version of events. It gives rise to a new interpretation that renders the assertions of the "official version" null and void.
*Even if they were considerably amplified, these signals could not have been generated by the crashes into the Twin Towers - the actual waves generated by the crashes were deadened before hitting the ground (assuming that we were dealing with the same (low) frequencies). Frequencies of waves generated by explosions are on the order of Hertz - which is the case here - while those of crash impacts are above 10 Hertz, often around 100 Hertz.
*As to the theory of the oscillation of the Towers to explain these signals, as defended by Irvine (2001), it doesn't hold water because in such a case we would have had a "square" signal of long duration and a constant amplitude, while in actuality we observe a "bell" signal, representing a strong and brief explosion, which is particularly evident in the case of WTC2.
*there is a hiatus of 15 seconds between the plausible time of the origin of the Rayleigh wave and the time - afterwards - of the crash of the plane into WTC1. What else but an explosion could be the origin for this seismic wave in the absence of an earthquake?
*Concerning the generation of the seismic waves following the crash into the Towers by a Boeing, the transformation of the kinetic energy into seismic waves would only make sense if we were dealing with a crash between two full, solid, and in-deformable objects.