Sorry guys...I know how much you love this stuff...
...but if I don't post it, and it could have helped someone....well, you know. Guilt and shit.
It is a serious earthquake warning for Southern California (7.0 or greater is expected from a scientific perspective within a week) - a letter was even sent to Governor Arnold. The site is down right now; probably due to high amounts of activity. The link may not work for a few hours. A "main signal" is what they are waiting on to make the final prediction of when and where. There was a 5.6 magnitude off the Oregon about an hour ago, as well. It is always a good idea to stock up on supplies - even if it is a false reading. Be safe.