Earthquake swarms like these are not uncommon, they happen somewhere along the San Andreas every couple of years, and they are not normally predictive of a super-quake. Still, it is sobering when the San Andreas Fault gets particularly feisty.
California is weirder than most people know. The whole of North America is on one tectonic plate, aptly enough named the North American Plate. All, that is, except for a narrow strip of land stretching from San Francisco to the tip of Baja California; we got a different tectonic plate. While the rest of the continent is moving in one direction, we here in California are stubbornly going the exact opposite direction.
Day after day, more people come to L.A.
Ssh! Don't you tell anybody the whole place is slipping away.
Where can we go when there's no San Francisco?
Ssh! Better get ready to tie up the boat in Idaho. ~ Day After Day, Shango, 1968 (sung to a calypso beat)