Surface Reflections/Conversions
Surface Reflections/Conversions : Waves leaving the source downwards and then undergoing one or more reflections or conversions (from P to S or vice versa) at the surface before arriving at the recording station, contrary to a depth phases, which leave the source in an upward direction. Examples are PP, PPP, SS, SSS, SP, PS, PPS, SP etc. 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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