间于地震炮爆炸和由其引起的地震脉冲开始时刻之间的时间延迟。也指以前的地震炮爆炸给同一个震源洞带来的地震炮环境变化。

A delay between the detonation of a shot and the initiation of the seismic impulse from it; a consequence of changes in the shot environment (usually formation of a cavity) produced by an earlier shot in the same hole.