That may have been it. I was young at the time so my memory of it is a bit fuzzy. Now my memory is much more ... wait, what was I ... ? Damn! I lost my train of thought again. :)
California trivia: The earliest reported earthquake in California was felt in 1769 by the exploring expedition of Gaspar de Portola while the group was camping about 48 kilometers (30 miles) southeast of Los Angeles.