Abstract: The mitigation and monitoring of the hidden underground civil defense tunnels are difficult to avoid in many of the old city reconstruction projects. To conduct a comprehensive exploration of these underground civil defense facilities by using ERT method, Microtremor survey are performed. The ERT for the underground tunnel of water filling levels and locating have higher reliability. The microtremor survey locating of the underground tunnel results in a better accuracy. Throughout the practice, it is confirmed that, using ERT combined with the micro integrated geophysical methods can achieve a better result in detecting the characterization of the abandoned underground civil defense tunnels and provides a reference for the similar projects.

Key words: Hidden, Underground Civil Defense Tunnel, Integrated Geophysics, Response