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R.Mackey : What's missing here is the LDEO signals are time-corrected for the expected siesmic travel time. The actual source of the 10 second delay is the time between the start of the collapse and anything massive hitting the ground.
Thus, no conflict.
There seem to be a need to proof to the obvious far too casual reader, that LDEO indeed did include the 17 sec delay in their recordings of received seismic signals from New York on 11 September 2001 in their seismic charts.
And that the event time stamps printed by LDEO above the "Seismograms recorded by LCSN Station PAL (Palisades, NY)" of the plane impacts and building collapses were the actual times of the incoming signals at PAL.
Not the actual event times in New York.!
There is a 17 seconds delay time for the seismic signals to travel through the upper crust from NY to PAL, as stated by LDEO them self.
The two collapse charts, when reduced to the same sensitivity as the 3 others (0 -10 nm/sec), clearly show preceding seismic events, just as big as the (23 sec chart position) preceding seismic event in the WTC 7 chart.
THUS I REPEAT :
That can only mean one thing.
13 seconds before NIST found their first visual event proof of building failure, the east penthouse roof dent photograph by Nicolas Cianca, some seismic event, comparable to the head-on collision of a huge air plane on each WTC 1 and 2 towers, shook the bedrock at the WTC-7 building.
And the same comparable seismic events preceded the 2 Collapsing Towers.
Between 1995 and 1997, British Steel's Swinden Technology Centre, co-sponsored by the European Coal and Steel Community (ECSC) with TNO (The Netherlands) and CTICM (France) as partners, carried out a fire research programme on a modern multi-storey composite steel framed structure built within the BRE large scale test facility at Cardington. The research programme aimed to understand and develop numerical calculation procedures that are capable of describing and predicting the structural behaviour of modern multi-storey composite steel framed buildings subject to fire attack.
...six full-scale fire tests on a real composite frame structure at Cardington showed that despite large deflections of structural members affected by fire, runaway type failures did not occur in real frame structures when subjected to realistic fires in a variety of compartments.
Approximately 40 supplementary reports and over 10 technical papers have been written and appear as an appendix to this report. This amount of work has ensured that the conclusions presented have been verified by a number of independent approaches. Mutually reinforcing arguments were developed from the results of different computational models, application of fundamental mechanics and the analysis of test data. It is therefore with a great deal of confidence that these findings have been presented for close scrutiny by the profession.
Originally posted by Caustic Logic
So re: the OP, whaddyou guys think of that bldg damage? I don't know if it matters in the big picture but isn't odd we've all ignored it looking at that shiny north face with a couple of fires, yakking about how no plane hit it (ie no structural damage) so it HAS to be a demo? I'm not saying it's not a demo, just why frame it like that?