可控源音频大地电磁法是一种测量卡尼亚电阻率和相位的电磁探测技术,在工程勘查领域取得了显著的应用效果。本文介绍了该方法的探测原理及资料解释,利用GDP32-Ⅱ多功能电法仪对石郑客运专线洪河特大桥址进行了勘查,查明了设计线路下方存在的隐伏断层,为大桥的设计、施工提供了重要的地质资料料。 Controllable Source Audio The MT method is an electromagnetic detection technique that measures the Karnia resistivity and phase and has achieved significant results in engineering exploration. In this paper, the detection principle and data interpretation of this method are introduced. By using the GDP32-Ⅱ multifunctional electric method instrument, the Honghe extra large bridge site of Shizheng Passenger Dedicated Line is surveyed to find out the hidden faults existing below the designed line. , The construction provided important geological materials.