The true onset time of a seismic phase could be defined as the moment when the first energy of the particular phase arrives at a station.
震相开始的真正时间可以定义为这个震相的第一波能量到达一个位置的时间。
参考来源 - 利用现代技术测定地震信息的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Seismic phase analysis is the most fundamental and basic work in seismological research.
地震震相分析是地震学研究中最基本、也是最基础的工作。
Seismic phase analysis and identification are the basis of earthquake prediction and speed report.
震相识别与分析是地震预报与速报的基础。
The PL wave is a seismic phase which has been attracting attention of the seismological community since the 1960's.
pl波是六十年代以来引起地震学界注意的一种震相。
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