For spherically symmetric Earth models, P-SV wave motion separates completely from SH motion. Despite this, P waves are often observed (weakly) on the transverse component (e.g., Figures 4.17 and...

For spherically symmetric Earth models, P-SV wave motion separates completely

from SH motion. Despite this, P waves are often observed (weakly) on the transverse component (e.g., Figures 4.17 and 4.23). Give several reasons why this might

occur.