[Island Chris]

I mentioned the quakes to earth scientist, sometimes seismologist Leonardo "Nano" Seeber last night when we were discussing block rotation models for onshore Santa Maria basin. I mentioned the NW-SE shortening of reverse-slip earthquakes for the focal mechanisms, and he said it sounded like what you might get with rotations (vertical axis). Brian's graphic shows the quakes to be on a cross fault (NE-SW), and cross faults can be signs that an area is rotating.

I'll forward the link and my email to Nano.

Chris