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TruthSeeker1234 : No, the clocks are not incorrect. They are time stamped with UTC. The 12-second sweep time could create a margin of error of +/- 6 seconds (LT : NO ), which is still not enough to explain the 17 second discrepancy. However, the data are not based on a single radar, they are based on 5 radars, with independent sweeps. This data is processed through software logic to arrive at accurate event times. The data of impact times comes from FAA, and they are accurate to within 1 second.
Kingdome implosion seismograms
The implosion of the Kingdome on March 26, 2001 (News Coverage : put this link in Archive.org : seattletimes.nwsource.com... ) generated seismograms at many seismographs in the Seattle area and farther. Detectable signals can be seen as far away as Mount Rainier (station FMW) and in the north Cascades (station RPW). The signals generated are more similar to those generated by a large rockfall than to those generated by an earthquake. Thus determining an earthquake magnitude for this event is not valid. However, using the same techniques for determining magnitude we can estimate an "equivalent" magnitude of 2.3, which matches fairly well with how the event was perceived by people in the area and how far away the seismic waves were recorded. Seismic source appears to start at 08:32 PST.
Webicorder of stations SP2 Seward Park broad-band record.
(Put this link in Archive.org: web.archive.org...://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/KINGDOME/SP2.webi.kd.gif ) (LT : and you see it's not saved in 2007, a pity.
Webicorder of station QAW, Queen Anne Hill accelerometer instrument.
(Put this link in Archive.org: web.archive.org...://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/KINGDOME/QAW.webi.kd.gif) (LT : and luckily it's saved in 2007.
It's the only big one at 08:32 PST on the 7th (blue) line from the top. As you see, Seattle is a busy seismic spot, a risky place to live near that brewing hot spot under that National seismic park :)
Multichannel seismograms filtered to standard WA response. (used to calculate equivalent Magnitude: 2.3)
(Put this link in Archive.org: web.archive.org...://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/KINGDOME/kd.gif) LT : and luckily it's saved in 2007 :
Different version of multichannel records at compressed time scale and more stations.
(Put this link in Archive.org: web.archive.org...://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/KINGDOME/kd2.gif) LT : and you see it's not saved in 2007, a pity.
The implosion: pushing the button
The implosion will take place in two phases, collapsing the Dome in six sections. Explosives in three sections will be detonated, followed several seconds later by detonations in the remaining three sections. Detonation will begin when an electric pulse is sent through two wires encircling the Dome, setting off six electric charges. The charges will ignite the network of orange detonation cords that will burn up instantaneously in a bright flash lighting the fuses to the explosives. Timed groups of explosives will then go off at different intervals.
A sequence of small explosions in the first three sections will fracture the concrete in the ribs, columns and supporting tension ring. The flexible rebar that runs through the concrete will remain intact. As the heavy concrete roof drops, the rebar will act like ropes pulling the columns down and toward the center.
As the first sections fall, the next three sections will be detonated and collapse, bringing the center compression ring down with them.
Gravity takes over
The entire procedure will take nearly 20 seconds, with about 12 seconds of actual explosion time. The structure will have collapsed inward, with the pile of debris at the center as high as 25 feet and the perimeter debris, including columns, as high as 60 feet.
After the implosion
Three work crews will clear the remaining pile of rubble. Large pieces of material will be broken down further and the top of the pile will be brought to grade level. Steel reinforcements will be separated from the heap for recycling. Foundations that conflict with new construction will be removed.
Of the initial 130,000 tons of material that made up the Dome, 80,000 tons were recycled onsite or hauled away before the implosion. Of the remaining 50,000 tons, most of which will be concrete, 35 percent will be used onsite as backfill for the new stadium. The rest will be sold as recyclable material.
Graphics and text: Phil Loubere; Reporting and text: Whitney Stensrud; Reporting: Jeff Hodson / © 2000 The Seattle Times
Bottom line, seismic data [collecting] is not a precise science in its [own, it's] only as good [as] the understanding of area ground composition and the collected historical seismic data for that area.
top page 1 : . 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.
According to the nature of the recorded waves (body and surface waves),
(LT : P(rimary) and S(econdary) shear waves, and Rg (Rayleigh) surface waves)
we can propose a location of each explosive source. According to the presence of shear waves, or the presence of Rayleigh waves only, we hypothesize a subterranean, or a sub-aerial explosion.
The magnitude of an aerial explosion is insufficient to provide seismic waves at 34 km.
(LT : The other two (subterranean and/or sub-aerial explosion), do provide them. But the collapse initiation aerial explosions high up, above the plane impacted floors, did not.
Top page 5 : In the three cases, the bell-like form points to an impulsive source of energy, not percussion on the ground due to the (LT : gradual) fall of debris.
Referenced article at the center of page 16 :
Pacific Northwest Seismograph Network (2000): "Kingdome implosion seismograms, special Kingdome Implosion event information," University of Washington Department of Earth and Space Sciences.
( www.geophys.washington.edu... )
Page 11/23 by Dr. Rousseau : Note that in accordance with the degree of dispersion of the surface waves (i.e., their speeds depend upon their frequencies), the duration of the recorded signal is not representative of the duration of the signal at the source.