Recent tracing appears to show that movement of WTC 1 features, such as the NW corner, Washer and antenna begins during/immediately after the Sauret footage camera shake.
Initial movement is horizontal, rather than vertical.
There is, of course, also the piece of debris ejected from the NW corner of WTC 1 at the onset of the camera shake, which I'm sure has been the subject of discussion in the past, but correlation to the latest trace data raises (or re-raises) an important question.
I shall of course post the trace data and graphs here soon, but am starting the thread now to try and ensure that we're looking at multiple data-sets. (OWE & Achimspok
Diving right in and asking questions...
If we agree that building deformation begins at the same time as the camera shake, and at the same time as visible ejecta from the NW corner (fl 104/5)...is it reasonable to conclude the events are linked ?
If so, then what events could result in the camera shake ?
Seismic activity ? If so, it would not be localised, so should appear on seismic records, yes ?
Basement disturbance ? What scale of *explosion* would result in camera shake at the camera location, but not on seismic records ?
And of course...IF the shake is the end result of a *boom* in the basement, then how would destabilising the core at that location be expected to present itself in upper levels ?
(I have thoughts on answers to these questions, but looking for things I might not have thought of before making any serious *claims*...maybe just an unfortunate mini-earthquake ?