Interesting USGS says both -- all I know is it knocked me to the ground...
Per the USGS site Loma Prieta was a magnitude 6.9 moment magnitude; surface-wave magnitude, 7.1. Hummm, I lived in CA all my life and never heard of this 2-number system. Guess it's all in how it rolls or shakes.
Hope everyone is ok up there, 6.5 is enough to really start rattling the nerves.
Didn't feel the 6.5 yesterday but felt the small 4.1 a couple of days ago. I hate it when we start have a few of them like this, and that this 6.5 was clearly no aftershock, it always make me think a bigger one will come. Loma Prieta took all the fun out of earthquakes. Actually we had damage from a precursor to LP 2 months before it hit, then WHAM. Now they scare the @*#@ out of me.