Just offshore...!
http://maps.google.com/maps?q=40.6743+-124.6552(M6.5+-+OFFSHORE+NORTHERN+CALIFORNIA+-+2010+January+10++00%3A27%3A39+UTC)&ll=40.6743,-124.6552&spn=2,2&f=d&t=h&hl=e
Ah. Way up north in the Mendocino fault. Tidal wave activity?