All: Even if you felt nothing, please report at "Did you feel it?" here:
https://earthquake.usgs.gov/earthquakes/eventpage/nc73948665/executive
https://earthquake.usgs.gov/earthquakes/eventpage/nc73948665/executive
Comments
That's the most important part, imo, as it is most likely to give us new info about how the new systems are working.
That said, 1. There are things you can do to assess and reduce your own risk. 2. The Bay Area has done a LOT to reduce risk since 1989, with more to come.