Table 1. Number of magnitude 5 and greater earthquakes each year in southern California from 1933 to present (a blank is no earthquakes, and – is no data). The first number in the first column lists the decade, and the top row lists the last digit of the year for that decade. For example, there were eight magnitude 5 and greater earthquakes in 1946, and seven magnitude 5 and greater earthquakes in 1987. Years with large numbers of magnitude 5 and greater events include aftershocks of larger earthquakes. Credit: Data from the SCSN catalog; Kilb et al., 2025, CC BY-NC-ND 4.0