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On some problems of seismic crustal phase
Authors:Huan-Cheng Ge
Institution:(1) Seismological Bureau of Jiangsu Province, 210014 Nanjing, China
Abstract:In this paper, some practical problems in seismological observations are discussed on the identification of seismic crustal phase, such as: “whether 
$$\overline P $$
(Pg) and 
$$\overline S $$
(Sg) are direct waves or not?”; “whether 
$$\overline S $$
(Sg) and Lg as well as IIg and 
$$\overline P $$
(Pg) are two kinds of waves or identical wave?”; “on seismological phases in regional travel-time table”; “on the symbols and identifications of phases in seismological observation reports”; “on the relation betweenm Lg andM L”, and so on. Some confused ideas on these problems are clarified.
Keywords:seismological observation  near shock  seismic phase  magnitude
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