PKPpre


PKPpre :

PKP phases become first geometric arrivals beyond the core shadow. However, sometimes on short period seismograms at a distance range of about 128 to 145 , clearly visible waves arrive a few to 10 seconds prior to the PKP phases. The addition pre stands for precursory. These precursors are explained by scattering at heterogeneities in the lowermost mantle (D") or near or at the core-mantle-boundary. See Kulhanek (2002, p. 341-342), and Song (2002). 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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