The Meinong Earthquake left several structure failures and severe geotechnical disasters in the Tainan area in southern Taiwan on February 16, 2016. Amongst these disaster events, liquefaction caused residence settlement and tilt and also damaged underground critical infrastructures, such as water supply, electricity, telecommunication, sewerage, and industrial facilities. The failures on underground pipelines were highly associated with differential settlement between buildings and access roads on the liquefaction zones. Moreover, leaking oil, gas, and other chemical transport pipelines sometimes could result in disastrous secondary hazards in life and property. In this paper, two commonly-used geophysical inspection methods, including resistivity imaging and multi-channel analysis of surface wave (MASW), were applied to on-site investigation on two post-liquefaction zones. The spatial distributions related to geological characterization, groundwater, and shear wave velocity could be effectively identified by using these two geophysical inspection methods. In future, one could use this technique to rapidly investigate post-damage conditions or in advance evaluate the liquefaction potential over a large region.