I laughed when I heard initial reports that the Russians had hit it with a missile and caused the explosion. The thing was coming in at Mach 50! Anyway, the seismogram shows a single clean pulse. And there are those hundreds of videos. The Russians sure like their dash-cams!
If it had come in at a steeper angle, we would have had a big crater, but most likely not at the city. The Russians have the biggest landmass so they just suck in all these hits. :)