Pb, P*
Pb, P* : Designates P waves critically refracted through an intermediate layer in the Earth's crust with a velocity between ~6.5 and ~7.5 km/sec. The upper boundary of this layer has been called the Conrad discontinuity. An alternative, still accepted phase name is P*. For these and other such symbols used in seismic phase names see IS 2.1 in this Manual and Storchak et al. (2003)
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