| 摘要 |
PURPOSE:To forecast effectively the occurrence of earthquakes by means of using a noninduction coil or a semiconductor element to transfer the mass wave into electric current. CONSTITUTION:A cross-type nonconduction coil B receives the mass wave, and an alternating current picked-up therefrom is applied to an LPF22 having a choke coil 20 and a capacitor 21 so as to remove the high-frequency wave. The alternating current is rectified by a bridge rectifier circuit 23, and the rectified current is supplied as a pulse current to a high speed recorder E to be recorded therein. A semiconductor element C may be used in place of the coil B' to obtain the similar resultant records. |
