There were fairly widespread riots after the Rodney king verdict. I distinctly remember checking my firearms as news spread of the unrest - just in case the bad guys came calling in my neck of the woods. But I believe there was little if any as a result of Northridge.

Just speculation, but aren't you more likely to see unrest and rioting as a result of unpopular socially centered events like the RK verdict, as opposed to natural disasters like earthquakes?