Radiation pattern of a few moment tensor earthquake sources

Four type of earthquake sources:
1) explosion M=[1 0 0;0 1 0;0 0 1]
2) single force M=[1 0 0;0 0 0;0 0 0]
3) double couple M=[1 0 0;0 0 0;0 0 -1]
4) CLVD M=[2 0 0;0 -1 0;0 0 -1]
and their corresponding radiation patterns of both P- and S-wave in the far field

Explosion source and vector source

Explosion source and vector source

Double-couple and CLVD source

Double-couple and CLVD source

Other than that explosion generates no S-wave, all other sources generate both P- and S-wave energy in the far field including DC, CLVD.