I was scrolling through YouTube when I found a video of the 2020 Beirut explosion. (I wouldn’t have clicked on it had it not been for the fact that it was an angle I hadn’t seen before.) I noticed that as the final ammonium nitrate explosion occurred, the camera was moved and a whoosh was heard before the actual shockwave and boom reached the camera. Shockwaves travels at the speed of sound and this was what was visible as the massive condensation cloud, so what was this force that moved the camera almost as soon as the explosion began?
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Not an answer to your exact question, but related: shockwaves do not travel at the speed of sound, they travel faster.
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