地震记录的时间服务质量,一方面是由计时系统本身的精度决定,另一方面又受台站计时系统和标准授时信号之间的比对精度(对钟精度)所影响。假如我们将石英钟精度提高到日差小于10毫秒,而对钟误差却有零点几秒,那么地震记录的时间服务质量仍然是很差。因为时钟的高精度被淹没在大得多的对时误差中,起不到应有的作用。因此尽可能提高对时的精度,是很有意义的。 The quality of time recording of seismic records is influenced by the accuracy of the timing system itself on the one hand and the accuracy of the alignment (clock accuracy) between the station timing system and the standard timing signal on the other hand. If we increase the accuracy of the quartz clock to less than 10 milliseconds and the clock error to zero seconds, then the quality of time recording of the seismic record is still poor. Because the clock’s precision is submerged in a much larger timing error, it does not work. Therefore, it is very significant to improve the accuracy of timing.