Thanks for the reply. The sound must not have carried very far. It was pretty loud by Seaport Village. Couldn't find anything on KFMB's website. Google took me to some paranoid forum that had someone asking about it, but no solid replies.
I read there was earthquake, could of it been a pre tremor? http://www.cbs8.com/story/19759312/42-magnitude-earthquake-shakes-san-diego-county