SKS SPLITTING BENEATH SOUTHERN CALIFORNIA
Measurements of SKS phase splitting were obtained from
nineteen seismic stations in southern California.
The fast polarization directions are
53 degrees at the southern end
of the Great Valley, 82 +-8 degrees in the western Transverse Ranges
and northern Peninsular Ranges, 95 +- 4 degrees in Mojave Desert, and
70 degrees on San Clemente Island.
The splitting time ranges from 0.8 to 1.8 seconds, which is
consistent with an anisotropic layer of 100 to 200 km thick for 4%