Dec 012012

Journal of 9/11 Studies Volume 34, November 2012
Were Explosives the Source of the Seismic Signals Emitted from New
York on September 11, 2001?
By Dr. André Rousseau

We would like to thank Tod Fletcher, who provided editorial assistance by revising an
earlier version of this article.

The seismic signals propagating from New York on September 11, 2001,
recorded at Palisades (34 km) and published by the Lamont-Doherty Earth Observatory
of Columbia University (LDEO), have here been subjected to a new critical study
concerning their sources. The aim of this paper is to demonstrate that the nature of the
waves, their velocities, frequencies, and magnitudes invalidate the official explanations
which imply as sources the percussion of the twin towers by planes and the collapses of
the three buildings, WTC1, WTC2 and WTC7.

First of all, we show the contradictions in the official explanation between the
seismic data and the timing of the events. Then we point out that it is strange that
identical events (percussions of identical towers on the one hand, and collapses of
identical towers on the other hand) at the same location would have generated seismic
sources of different magnitudes. We demonstrate that only strong explosives could be the
cause of such seismic waves, in accordance with the observed low frequencies

Link to full article here