22-10-2012, 06:01 AM
By watching many videos of the collapse and paying attention to the smoke plume, Penthouse collapse, main building collapse, and second count on the video. The best gauge is the Banfield video where they show the standing building as she speaks. It's still possible the booms were the falling floors of the Penthouse core or subsequent collapse of the supporting members prior to the main collapse. If so I'd damned like to see the oscilloscope from Banfield's microphone as the main building fell for comparison.