十九世纪末,由于现代地震仪器的诞生,地震学便获得新生,从此,不再是一门仅是描述性的科学,而转变为一门数学——物理学的科学。它使人类在本世纪对地球甚至月球的认识有了飞跃的发展。七十年代初,我国笔绘记录地震仪DD—1(短周期,T_1=1秒)及DK—1(中长周期,T_1=15秒)的诞生,在临震监视与速报方面发挥了重要作用。然而它存在的一些弊 At the end of the nineteenth century, seismology was reborn as a result of the birth of modern seismic instruments. From then on, it was no longer merely a descriptive science but a math-physics science. It has made a great leap forward in humankind’s understanding of Earth and the moon in this century. In the early 1970s, the birth of pen-record seismograph DD-1 (short period, T_1 = 1 second) and DK-1 (medium-long period, T_1 = 15s) Important role. However it has some disadvantages