Fig. 3. Cross section of the seismicity for 1975-1984 along the section
A-A' (Fig. 1) of the San Andreas fault. Relative focal depths are generally
accurate to 1 km or less; depths of the shallow shocks northwest of the
preparation zone are less accurate, with an uncertainty of about 2 km. For
reference, the hypocenters of the immediate foreshock of ML 5.1 and the main shock in 1966 are shown as small and large stars, respectively,
and the approximate outline of the 1966 aftershock zone (rupture zone) is
dashed.
