"Things You Wouldn't Know If We Didn't Blog Intermittently."
Bomb? Meteor? What caused it?
It's not an impact crater. It's a "roof collapse" above either a natural cavern or an abandoned mine. There was no identifying data at the site where I found the picture, but I'm sure I've seen this elsewhere in the past. Perhaps some Googling would turn up an answer. (Also, I think there is now a picture-search site where you insert a picture and it searches the web for other publications of the same or similar pictures; I have no experience with doing that.)stan
Good story here: http://www.zuzafun.com/big-hole-in-the-city#more-134 An underground sewage flow from a ruptured main in Guatemala.