This is an older population map of China, but you can see that the density of people in Chengdu is greater than anyplace else:
cHINA POPULATION AND DENSITY MAP
The buildings there are typically very old or of suspect construction if they're modern. It's not a particularly modernized province. The effects of this quake could be dreadful.
Thanks for the info. Check out the link on post 18 where they say the pop. is very thin and so far there are no reports of widespread injuries or damage.
Oh my. 100+ Million people in that province; if my sleep deprived eyes aren’t lying to me. I appreciate the research into the area. I hope to find out more when I wake up. Thanks.