Sg 04
Sg 04 : S waves propagating through the crust like Pg. An older but not longer standard nomenclature for this phase is S . At greater distances the travel-time curve of Sg is becoming (due to multiple paths all trapped in the crust) the onset of the Lg wave group. Then both names are often alternatively used for the same seismic onset. For this 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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