Figure 5

Map of the locations of seismic profiles for northern California. This shows segments exhibiting strong slab mantle reflections (the phase PmP, a downward P wave that reflects at the top of the mantle, m, and returns to the surface as a P wave) near the coastline (purple lines), those with weak PmP (green), and those having strong PmP reflections along inland profiles in the North America Plate (Nam, yellow). Seismic lines with observed intermediate-amplitude PmP reflections are shown as dashed or hatched yellow/green lines.