The Elsinore fault is a fairly quite fault with normally 250 years between ruptures; the last was in 1909 I think, very rare for anything over 6 points even at that. The San Jacinto fault on the other hand is the most active fault in Socal. but again most major quakes on this fault never exceed 6.5 the biggest on record I think was 7.2 (San Jacinto fault).