Abstract: Combined with the theoretical model and actual case analysis of the pseudo magnetotelluric interpretation by using transient electromagnetic method, the anomalies in the urban geological survey could be identified. In the karst rock cavity investigation, the cover soils are characterized by the low electrical resistance layer, the dissolution rock belt is represented by a resistivity gradient belt, the filling material dissolved cave show the abnormal low resistance body. The electrical structure of the landfill is characterized by the low resistivity landfill zone surrounded by high resistance impervious area, no low resistance channel gradient belt, the landfill anti-seepage effect is good.

Key words: transit electromagnetic method (TEM), urban geological and environment survey, pseudo magnetiotelluric, karst, garbage pollution