California Having Foreshocks?

Today, I've been reading about swarms of earthquakes centered at and around Anza, California.

It is not too surprising since the state is overdue for a big one. They usually have a 20-year cycle. Two immediately come to mind: the Sylmar Earthquake in February 1971 and the Northridge Earthquake in January 1994.

California should have had a big one about 8 to 12 years ago, if the pattern held.

Could these be fore-shocks?

That's one thing I definitely don't miss about California, earthquakes.