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Report about Seismic Observations during September 11, 2001, Terrorist Attack

[NOTE: The "weak" seismic records from the Pentagon are because no plane crashed there. The strong records from Shanksville, where no plane also crashed, suggest that some explosions were set off to create them. Very curious!]

Seismic Observations during September 11, 2001, Terrorist Attack

Won-Young Kim

Lamont-Doherty Earth Observatory of Columbia University,

Palisades, N. Y. 10964, USA

and

Gerald R. Baum

Environmental Geology and Mineral Resources Program,

Maryland Geological Survey

2300 St. Paul Street

Baltimore, MD 21218, USA

Summary

Since the time of plane impact at the Pentagon had often been reported with large scatter, the
United States Army contacted us to inquire whether we could obtain an accurate time of the
Pentagon attack on September 11, 2001 based upon our seismic network. We analyzed seismic
records from five stations in the northeastern United States, ranging from 63 to 350 km from the
Pentagon. Despite detailed analysis of the data, we could not find a clear seismic signal. Even
the closest station ( = 62.8 km) at Soldier’s Delight, Baltimore County, Maryland (SDMD) did
not record the impact. We concluded that the plane impact to the Pentagon generated relatively
weak seismic signals. However, we positively identified seismic signals associated with United
Airlines Flight 93 that crashed near Shanksville, Somerset County, Pennsylvania. The time of the
plane crash was 10:06:05 5 (EDT).

http://www.mgs.md.gov/esic/publications/download/911pentagon.pdf

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Comment by Thoth II on July 5, 2012 at 5:49pm

right, I'd add this to the long list of evidence no plane ever crashed into Pentagon.  

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