Petra wrote:

"Patterns in seismicity change over time and I'll provide a very good example. In the 1970's through most of 1989 the San Francisco Bay Area had 3.0 quakes on average every 18 days. Mixed within that we had plenty of 4.0 and 5.0 quakes, but not since. This is a direct result of the Loma Prieta earthquake on 10/17/89"

This is very true indeed. Do you or anyone else have a theory for this? Is it just like 06 when everything went quiet? Same effect, Loma Prieta essentially turned the faults off?