通常当选择电测深极距方向时,要注意到地表地形条件,以及那些用在电法勘探必须查明的地层的产状单元。在地形强烈切割的情况下,地表地形的性质具有很大的意义。这时,装置应沿相当延续的边坡布置,以使不同电极距的接地装置,尽可能地位于同一水平面上。在地层倾斜陡峻时,测深装置要沿其走向布置。当这些因素不适合时,要考虑实际的地质和地形情况,采取折衷的方法来解决。测定坚硬岩石埋藏深度时,电极距方向的选择更 In general, when selecting the polar direction of the electrical sounding, pay attention to the topographic conditions of the terrain and those units that are used in the formation that must be identified by electrical prospecting. In the case of intense terrain cutting, the nature of the surface topography is of great significance. At this time, the device should be along a fairly continuous slope, so that the grounding distance between different electrodes, as far as possible in the same level. When the formation is steep, the sounding device should be arranged along its course. When these factors are not suitable, the actual geology and topography should be taken into account and a compromise method should be adopted. Determination of hard rock buried depth, the electrode from the direction of the choice of more