Diffracted P (PDIF)
Diffracted P (PDIF) :
The P wave that follows a ray path from seismic source that grazes the Earth's core, is diffracted along the core-mantle boundary, and emerges at an epicentral distance of about 97o on. Diffracted P waves are observed, especially long period frequency ones, in the shadow zone beyond distances of 140o (See: Figs. 11.59 and 11.63 ??? in Chapter 11 of this Manual as well as Aki and Richards (2002 or 2009, p. 456-457). For this 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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