临震前的突跳性前兆已经引起人们的广泛注意,但其成因尚在探索过程中。一般认为,临震前震源地方出现予滑是引起突跳性前兆的原因之一。但据有关的研究,予位移量很小,它很难直接引起如此剧烈的前兆变化。因此在予位移和突跳性前兆之间可能存在着某种高放大过程。这种高放大过程应当具有爆发的特征。我们认为过热液体的暴沸 The sudden precursory before the earthquake has aroused widespread attention, but its cause is still in the process of exploration. It is generally believed that one of the reasons causing sudden jump is one of the reasons that sudden slip occurs before the epicenter. However, according to the relevant study, the amount of displacement is very small, it is difficult to directly cause such a dramatic precursor changes. Thus there may be some sort of high magnification between pre-displacement and sudden jump precursors. This high-magnification process should have explosive characteristics. We think the bubbling overheated liquid