如果向岩石施加应力,则如图1所示,与膨胀的开始相应,从破裂应力的50％—60%开始大量产生 AE 活动,在应力增加的同时,发生量也加速地增加,最终达到破裂。这是一种自茂木(1962)和肖尔茨(1968)的研究以来众所周知的现象。这里将这种 AE 活动称之为 L 型。AE 活动可认为是伴随微破裂的弹性波动,是与地震相对应的。如果在相当于最终破裂的大地震之前出现图1这样的地震活动,则对大地震的预报是有用的。 If stress is exerted on the rock, as shown in FIG. 1, corresponding to the start of expansion, a large amount of AE activity starts to occur from 50% to 60% of the rupture stress, and the amount of occurrence also increases rapidly and finally reaches the rupture . This is a well-known phenomenon since the study of Mauchwood (1962) and Scholz (1968). This type of AE activity is called L type here. The AE activity can be considered as the elastic wave with micro-rupture and corresponds to the earthquake. It is useful to predict large earthquakes if the seismic activity of Figure 1 occurs before the large earthquake that eventually ruptures.