Using theP-wave travel times listed in Table 6.1 (values from the IASP91 tables for a source at zero depth, Kennett, 1991), apply the geometrical spreading equation (6.23) to predict the relative...

Using theP-wave travel times listed in Table 6.1 (values from the IASP91 tables for

a source at zero depth, Kennett, 1991), apply the geometrical spreading equation

(6.23) to predict the relative amplitude of P waves recorded at the surface from an

isotropic surface source at ranges of 30◦, 60◦ , and 90◦. Assume that the surface P

velocity is 5.8 km/s. If the amplitude at 30◦ is unity, what is the amplitude at 60◦

and 90◦? Hints: Be sure to convert the psph values in Table 6.1 to s/radian in order

to obtain correct units. Check the values you compute for the ray takeoff angle θ1

to be sure that they look reasonable.