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我们用自制仪器于1977年首次在西藏高原进行了大地电磁测量。本文给出了那曲、曲水、江孜、帕里、亚东5个测点的测量和反演结果。 5个测点均反映为五层地电模型。得到如下结果: 1.那曲、曲水、江孜、帕里及亚东前四层总厚度分别为:66、65、62、57、50公里; 2.各测点电性特征相似,均属低—高—低型; 3.各测点的地壳中均存在一低阻层,其埋深约为10—20公里; 4.以雅鲁藏布江为界,南北两地区电性层厚度变化程度有显著差异,北部平缓,南部较剧; 5.表面沉积层厚度在4公里左右。
For the first time in 1977, we conducted a magnetotelluric survey of the Tibetan Plateau using homemade instruments. In this paper, the measurement and inversion results of 5 stations in Naqu, Qushui, Gyangze, Parry and Yadong are given. Five measuring points are reflected as a five-layer geoelectric model. The following results were obtained: 1. The total thickness of the first four layers of Naqu, Qushui, Gyangze, Pari and Yadong was 66, 65, 62, 57 and 50 km respectively; 2. The electrical characteristics of each measuring point were similar and both were low - high-low type; 3. There is a low resistivity layer in the crust at each measuring point with a buried depth of about 10-20 km; 4. The extent of the change of the electrical layer thickness in the north and south regions is significantly different from that of the Brahmaputra , The north is gentle, the south is more drama; 5. Surface sediment thickness of about 4 km.