3.(4 pts) The travel-times for PcP, PKiKP, and PKIKP are shown in Figures 3.5-4 and 3.5-7 which are attached. You can use an outer core radius of 3482 km, and an

inner core radius of 1217 km. a) Use the travel-times for PCP and PKiKP (Figure 3.5-4) at vertical incidence (incidence angle = 0°) to estimate the average P-wave velocity in the outer core. Include a sketch that explains your reasoning. b) Use the travel-times for PKIKP and PKIKP (Figures 3.5-4 and 3.5-7) at vertical incidence to estimate the average P-wave velocity in the inner core. Include a sketch that explains your reasoning.