引言如所周知,在用地震方法研究地壳表层时,已广泛地应用多道示波装置.然而通常在地震站中,用电流计来记录弹性波的方法是有很多缺点的。首先我们指出,电流计和其他的机械系统一样,都是一个惯性系统。特别在我们所研究的振动超过电 INTRODUCTION As we all know, multi-channel oscilloscopes have been widely used in the study of the earth’s crust surface using seismic methods, however, the usual method of recording elastic waves with ammeter in seismic stations has many shortcomings. First of all, we point out that ammeter, like other mechanical systems, is an inertial system. Especially in our study of vibration than electricity