It's not the Three Gorges. I was curious about the same thing the other day and after some fiddling with google maps I was able to figure that Three Gorges is about 600 miles away from the quake zone. To the east.
600 miles isn’t all that far when it comes to plate tectonics, is it? I think I’m probably looking at it a little childishly. The cause and effect—the water weight pressing down on one part of the plate, causing another end to shift and rise—it seems plausible, in a five-year old kind of way. That can’t be all there is to it. If it were, the dam would never have been built in the first place, right? I’m either stupid or naive today.