一、前言一场大地震能在数小时内夺去成千上万人的生命,毁坏数以千计的房屋。若是预先把地震源捉住,作到预报,采取抗震防震措施,是可以减少损失的。众所周知:“地动山摇”是一场大地震的宏观反映。既然有那么大的力量使大地摆动,山峦摇晃,可以料想到在震前数小时、数天、数月以至数 I. INTRODUCTION A major earthquake can kill tens of thousands of lives and destroy thousands of homes in a matter of hours. If the earthquake source in advance to catch, make forecasts, to take earthquake and earthquake mitigation measures, it is possible to reduce losses. As we all know: “moving” is a macro reflection of a major earthquake. Since there is so much power to make the earth swing, the mountains shaking, you can expect a few hours before the earthquake, a few days, months or even