We've seen the aftermath before, but this before/after is impressive, no? More after the jump...
In another classic post, Burrito Justice gives name to an infamous geological monster living under San Francisco, unleashed like Gojira upon Mission residents after the '06 quake:
The “18th St Gulch” (for the lack of a better term — feel free to come up with a catchier name) was bigger than I realized. This sketch (below) of the Mission from the 1850 looks NE from around 21st and Liberty and gives some indication of its depth.
Zooming in on the bottom right, we see the gulch at what will be Dolores and 18th, with a stagecoach hurtling out of control (ok, probably not, as it’s not even the steepest part).
We could call him "Gulchie the Sinkhole."
UPDATE (12/14/09): Gulchie seems to be expanding his territory these days.