Seismic data for WTC7?

[1337m4n]

I've had no problem finding seismic readings for the collapse of the Twin Towers, but seismic data regarding WTC7 thus far eludes me. Can anyone help me out?

Thanks in advance.

 

[GregoryUrich]

I've had no problem finding seismic readings for the collapse of the Twin Towers, but seismic data regarding WTC7 thus far eludes me. Can anyone help me out?

Thanks in advance.

It's on the LDEO site I believe. Interesting to note that the 18 second signal is not very consistent with NIST's findings.

 

[Sword_Of_Truth]

It's on the LDEO site I believe. Interesting to note that the 18 second signal is not very consistent with NIST's findings.

And yet there are no sharp spikes consistent with an explosive event in the seismic record of the collapses.

 

[leftysergeant]

It's on the LDEO site I believe. Interesting to note that the 18 second signal is not very consistent with NIST's findings.

What I have seen looks more like 40 seconds of increasing activity. I am a little puzzled, though, as to why you think 18 seconds for a progressive collapse is inconsistant with their report.

 

[PhantomWolf]

18 secs sounds about right from the start of the collapse under the Eastern Mech Penthouse through to the end of the final facade collapse.

 

[Baylor]

Here it is.

ldeo.columbia.edu/LCSN/Eq/20010911_wtc.html

Okay someone's really gonna have to teach me how to link websites directly. I'm about as good with the Internet as truthers are with women.

 

[Baylor]

If that doesn't work try this.

www.ldeo.columbia.edu/LCSN/Eq/20010911_wtc.html

 

[leftysergeant]

Given the duration of the seismic events arising from the collapses of the towers at 12 and 8-odd seconds, and knowing that the times were longer for the mechanical events, I think we can also assume that the process of collapse was well under way before the start of the 18 second event in WTC 7. This is, again, more consistant with a progressive collpase.

 

[T.A.M.]

And yet there are no sharp spikes consistent with an explosive event in the seismic record of the collapses.

Yes but don't forget that super powered Thermite Doesn't Explode....

See, gotcha!!!

9/11 Truth RULEZ!!!!!!!

TAM

 

[defaultdotxbe]

Here it is.

ldeo.columbia.edu/LCSN/Eq/20010911_wtc.html

Okay someone's really gonna have to teach me how to link websites directly. I'm about as good with the Internet as truthers are with women.

just copy/paste the entire address from your browser into your post (you cant do this until you have 15 posts, but you have 63 now)

 

[PhantomWolf]

Given the duration of the seismic events arising from the collapses of the towers at 12 and 8-odd seconds, and knowing that the times were longer for the mechanical events, I think we can also assume that the process of collapse was well under way before the start of the 18 second event in WTC 7. This is, again, more consistant with a progressive collpase.

Actually I have to disagree here. The Towers seismic events were short because they were a top down collapse, the collapse had already been happening for 9-10 seconds before the first peices started to hit the ground and create seismic results, the collapses then continue for another 7-10 seconds after the this resulting in the shorter peaks. With WTC 7 the collapses started lower down, so the collapse energy was being transfered into the ground right from the start of the collapse, hence why the entire 18 seconds of the collapse is shown in the siesmic data.

 

[jaydeehess]

Other differences between the the towers and WTC 7 could also account for the different seismic readings. That is how they were coupled to the bedrock, how the subway system may have interfered with the transmission of the seismic waves from the towers and the nature of the ground close to the foundation of each building.

AS PW points out the towers were top down collapses and thus the small (in comparison to the larger, multi floor events) internal failures several dozen floors above the ground in the towers would see the vibrations from them absorbed somewhat by the lower structure whereas in WTC 7 the initial faliures were only a few stories up on a neccessarily stiffer part of the structure, the lower frame around the pre-existing Con-Ed building or slightly above it.