Scientists Warn It Could Be Much Worse
Last month, scientists with the USGS reported that they had discovered that the Hayward and Rodgers Creek faults look like they are connected. This translates into the strong possibility that the seismic experts have underestimated the potential strength of the next big SF bay quake.
There is the possibility that when the Hayward ruptures, it could register 7.4 – five times stronger than the 1989 Loma Prieta quake.
Here is the relevant article: http://www.theverge.com/2016/10/19/13335816/earthquake-faults-san-francisco-oakland-bay-area-san-andreas-hayward
I pass this on not to create paralyzing fear, but to encourage everyone to take care of the basics of getting ready: have your retrofit checked, have an automatic gas shut-off valve installed, secure necessary furniture, appliances, and wall hangings, keep backpack emergency kits in your vehicles, and have two weeks worth of food and water available.
A reminder: my in-home QuakeConsult gives you a ton of helpful information, including all the things mentioned above (and more).