| 摘要 |
<p>Seismic wave generating apparatus comprises a probe (10) adapted to be received in the ground (18) and including spark discharge electrodes (20, 22) connected to an electrical discharge apparatus including a voltage converter (76) to convert a low (24V D.C.) voltage to a high output voltage (4000V D.C.). A storage capacitor (84) is charged by the converter (76). Switch means (90) switches to a conducting condition when the potential difference across the capacitor (84) reaches a preselected level and connects the storage capacitor (84) to discharge electrodes (20, 22). Feed back means (86, 60) transmits a signal to reset means (68) on discharge to reset the converter (76) to an operative condition. The apparatus is relatively portable and can produce seismic waves at regular intervals of seven to fifteen seconds over a considerable period of time.</p> |
