关键词: 滇西, 视电阻率, 地壳上地幔, 高导层, 构造活动, 地震

Abstract: Based on the data conducted from 18 MT sites in west Yunnan, the deep conductivity characterics along the longitudial and transverse directions of the geological structure are studied, The results indicate that the deep eletrical structure in this area is a multiple-layer structure with 4-5 electrical layers. There is great lateral inhomogeneity in the deep eletrical structure which are apparently controlled by the regional geological structure. There exists a widespread highly conductive layer in the crust, and two upper mantle highly conductive layer uplift zones are found, one is situated in Jianchuan-Heqing with the principal axis of NNW direction and another in Tengchong-luxi with approximately NS direction.The relationship between the electrical structure of the crust and upper mantle and the geotectonics, the formation of northwest Yunnan rift basin and the relationship between seismic activity and the deep geological structure are also discussed in this paper.

Key words: West Yunnan, Apparent resistivity, The crust and upper mantle, Conductive layer, Tectonics activity, Seismic