引言地震波走时表的研究,关系到震源参数测定的精确度,并与地壳及地球内部结构的研究有密切的关系,它是地震学的基础研究工作之一。 1939年Jeffreys-Bullen发表了一个比较完整的全球性的包括各种震相的走时表。以后得到了各国地震观测工作者的采用,作为对各种震相走时的主要依据。1968年美国Herrin等人又根据更多的全球性地震观测资料获得一组纵波走时表其中包括P、PP、PPP、PKP、 Introduction Seismic wave travel timetable study relates to the accuracy of source parameters determination and is closely related to the study of the crust and the Earth’s internal structure. It is one of the basic research work in seismology. In 1939 Jeffreys-Bullen published a more complete global time history including various phases. Later, the use of seismic observers in various countries was obtained as the main basis for the travel of various seismic phases. In 1968, Herrin et al. Obtained a set of longitudinal travel time tables based on more global seismic observations, including P, PP, PPP, PKP,