P-wave amplitudes and dynamic strains inside the earth

The isolines of P-wave amplitudes in the mantle radiated from a point source in the IASP91 velocity Earth model with the AK135 density and Q distribution are presented. The zero-order ray method is used for the computation. The amplitude isolines are given for three signal periods and three source depths for a point source and for a symmetric radiation pattern. The influence of the double-couple radiation is considered. The form of amplitude isolines is found to depend on the period of the propagating signal, due to the different attenuation, as well as on the radiation pattern and to lesser extent on the depth of the source. Finally, examples of isolines of the P-wave strain generated during the propagation are presented for different periods.