PKP triplication
PKP triplication :
This triplication, which has three distinct branches of a seismic phase at the same distance, is the result of wave propagation through a zone of steep velocity changes with depth within the Earth's core. At distances between ~ 145 and 155 all three PKP phases PKPab, PKPbc, and PKPdf can be observed. (see Fig. 2.53??? in Chapter 2 and and Fig. 11.59 ??? in Chapter 11 of this Manual). For these and other such symbols used in seismic phase names see IS 2.1 in this Manual and Storchak et al. (2003 and 2011)
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