This paper describes the computational methods and results of P wave travel-time table compiled for 1973. Basing upon the data available from 298 earthquakes and artificial blasts occurring in China and its neibouring regions and a large number of P wave arrival time data recorded by stations situated at home and abroad, the P wave travel time table is constructed using the statistic and iterative method to directly obtain four P wave from various depths (0, 15, 40, 50km). Examining the P wave travel time for a good many earthquakes and comparing the results with those received from a part of regional stations or macroscopic observations, the authors show that the table gives good results in the determination of basic seismic source parameters, including the origin-time of an earthquake and its location (longitude, latitude and depth). Moreover, the table is especially significant, in determining focal depths in view of the complexity of geologic structures in China which leads to the variation in the velocity of seismic waves while propagating in various directions and different regions. Therefore, the travel time table presented here for various depth of P wave is to a certain degree superior to that calculated by the method of velocity inverse.
. 1977, 中国P波走时表的编制. 地质科学, 12(1): 6-25.
. THE COMPILING OF P WAVE TRAVEL TIME TABLE IN CHINA[J]. Chinese Journal of Geology, 1977, 12(1): 6-25.