just heard that on the news and was gobsmacked at how to visualize 25 billion tons of dynamite going off. Also, did y'all see the videos on the news of the quake with the security cams? Some reports have it lasting as long as 4-5 minutes, other reports say 1-2 minutes. There will be better videos out there but this one is pretty short (30 seconds) and very telling.
https://www.youtube.com/watch?v=b-lq2QWLdOg
https://www.youtube.com/watch?v=b-lq2QWLdOg