Here is a Japanese computer animation simulation video of a meteor striking Earth and what it would look like and cause planetwide. The commentary is in Japanese so good luck with that. One thing I did notice is that they used a spherical meteor whereas other such 'Earth being hit by an asteroid' video the asteroid is never round. In the video the meteor strikes and causes a large amount of material to be ejected up into the atmosphere. Some of the things in the video seem a bit suspect like the fact that there isn't much (if any) burn up by the atmosphere on the meteor. The only explanation I came up for this was that the meteor was so big (much larger than 300 miles wide) that the atmosphere wouldn't effect it much. Second it seemed like the whole ejection area hundreds of miles above where the meteor hit was filled up with lava which didn't seem plausable. Is it just a bad particle effect or? Lastly, the buildings left standing (like the Greek pillars) seemed like they should have been blown away and were only left for effect in the video.
Watch the full computer animated Earth meteor strike simulation video below or click over and view it on the host site.