fyi
the san andreas fault is a transform fault, there is no subduction; the plates are moving parallel to eachother but in a different direction...
also because there hasn't been an earthquake in a specific place doesn't necessarily mean the next one is gonna be the big one...
plates move at a virtual constant rate; only the very edges get caught against eachother and move with the so called stick-slip mechanism...
let's say the plate moves 3cm/year;
in a catastrophic year you've had 10minor quakes, each moved the plate edge 1mm further and you've had one giant quake that moved the plate edge 2cm
^^10smooth quakes and 1 mother ffing big one!
or in a good year, you've had 30 minor quakes, every minor quake moved the fault 1mm further...
^^30smooth quakes that caused harm to nobody...
so in each year you've had 3cm of plate that has moved through the fault and released all his energy...
1year was catastrophic and the other one wasn't, while all that happened was virtually identical....