Directivity 1
Directivity 1 : A concept in seismic source studies that was introduced by Ben- Menahem (1959). An effect of a propagating fault rupture whereby the amplitudes and frequency of the generated ground motions depend on the direction of wave propagation with respect to fault orientation, slip direction(s) and rupture velocity. The directivity and thus the radiation pattern is different for P and S waves. See also: Radiation Pattern, Source Directivity and Doppler Effect, Eq. (3.8) and Figure 6 in Ben- Zion (2003), section 9.1.1 in Lay and Wallace (1995) and the animations in Chapter 3 of this Manual
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