femr2 wrote:Could you indicate where you think the explosion is ?
In the referenced video, starting between 10 and 11 seconds, duration of a little more than a second I think. A little echo, maybe. Given the distance, there would be a delay in sound reaching the camera, so if there's any component of the collapse preceding whoa-whoa-whoa, it would have to involve only the interior/penthouse. Leaving the bigger collapse conspicuously quiet.
Perhaps there is LF being picked up by the mike, but I don't hear any collapse of a 47 story building there at all. If the sound around 11 seconds originates from the collapse zone, it is many times louder than the collapse itself in the midrange and high. If the sound in question persisted for 6-7 seconds, it would be very noticeable against all the other ambient sounds.