Depth Phases (PP, PWP, PS, SP, SS)
Depth Phases (PP, PWP, PS, SP, SS) : Depth phases are called all seismic waves which propagated upward from the hypocenter, turned into downward propagating waves by reflection at the free surface. These phases are useful for an accurate determination of the focal depth and their phase names (codes) indicate their phase type before and after the reflection. 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). Further see Chapters 2 and 11 and Figure 7 in IS 11.1 of this Manual, Kulhanek (2002), Engdahl and Villasenor (2002)
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