Yes, kind of an odd pattern....where the Baja and offshore San Diego quake (and maybe the Central Valley quake) are roughly evenly spaced. The 3.1 ...which so far has not been checked by seimologist, is located a little west of the San Diego trough fault....which is a right-lateral strike-slip fault.....(but there was a M5.5 or so in 1986 thrust event near it farther north...the Oceanside quake....
Chris