Were Explosives the Source of the Seismic Signals Emitted from New York on September 11, 2001?

NTRODUCTION

When major shocks occur at the Earth's surface or at depth, waves of different types, magnitudes and speeds may move out from the source location. Such waves can be detected by seismometers located at recording stations, and the data from the recordings can be analyzed to learn many details of the source events. Seismic signals were recorded at stations in New York and four neighboring states on September 11, 2001 during the period when the North and South Towers (WTC1 and WTC2, respectively) were struck by airliners and collapsed, as well as during the collapse of Building 7 of the WTC, which had not been hit by a plane.

Data from the Palisades, NY recording station, located 34 km north-north-east of Manhattan, published by the Lamont-Doherty Earth Observatory of Columbia University (LDEO), provide the most detailed seismic waveforms for analysis, particularly for the determination of the locations (aerial, surface, or subsurface) and timing of the events that created the seismic waves.

Seismologists have been puzzled in their analysis of signals recorded for the events at the World Trade Center, as the contradictions are significant. They are particularly intrigued by the presence of seismic "peaks" before the collapses. This text focuses on the study of the seismic signals from Palisades. The new interpretation presented here renders the assertions of the seismic analysis of the events at the WTC, presented by the government, null and void.

STUDY OF THE COMPOSITION OF THE DIFFERENT WAVEFORMS

Five waveforms will be analyzed below. They are attributed by the LDEO team to specific causes, as follows:

1. the signals that, according to LDEO, match the moment when the planes hit WTC1 and WTC2, respectively, shown in figures 1a and 1b;
2. the signals that match the collapses of WTC1 and WTC2, respectively, shown in figures 2a and 2b; and
3. the signal that shows the collapse of WTC7, shown in Figure 2c.

The analysis presented here will question LDEO's identifications of the causes of the waveforms.

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