Also look at the Creep event in the San Francisco Bay area that occurred during the
recent geomagnetic storm at:

http://quake.wr.usgs.gov/research/deformation/data/sfb.creep.gif

Also look at the 90-day creep history to get an idea of how unusual this creep event
actually is

http://quake.wr.usgs.gov/research/deformation/data/sfb.creep.90.gif

This may have been related to the tensor strain event in the area on April 17 - see

http://quake.wr.usgs.gov/research/deformation/data/sfb.tensor.gif

Again, you can see the infrequency of such strain events in the San Francisco Bay
area at:

http://quake.wr.usgs.gov/research/deformation/data/sfb.tensor.30.gif

Looks like something is happening in the area in a geophysical sense, but not
sure yet how this translates to a strong earthquake in the near future, if at all.

• San Francisco Bay 90-day creep record