Source Directivity Effect
Source Directivity Effect : The effect of the earthquake source on the amplitude, frequency content and duration of the seismic waves propagating in different directions, resulting from the propagation of fault rupture in one or more directions with finite speeds. Directivity effects are comparable to, but not exactly the same as the Doppler effect for a moving oscillator. See Faccioli and Pessina (2003), and material below Eq. (3.8) and Figure 6 in Ben-Zion (2003)
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