Im not an expert on quakes but this doesn’t sound normal. Do quakes in California just happen at random near the fault lines or can they just advance like that? I remember 10 years ago there were a series of quakes that just advanced to each city in Northern Turkey.
I’d opt for random.. but you never know based on the types of strata involved, someday something has to give, bigtime, ‘til then, we see bursts of activity here and there, I’m a few miles away from a recently more bumpy area as well, but considering california is one giant seismic zone.. ya have your survival supplies set aside and hope you’re dust when the next big one hits. ;-)