天祝-永登地区大地电磁资料的一维各向异性反演

ONE-DIMENSIONAL ANISOTROPIC INVERSION FOR MAGNETOTELLURIC DATA IN TIANZHU-YONGDENG REGION

摘要:

对分布在甘肃天祝、永登一带的10个大地电磁测点资料进行了一维各向异性介质反演研究,并与二维对称各向异性介质反演结果进行了对比。结果表明在大多数情况下一维各向异性反演有可能揭示出地壳介质电导率各向异性结构的主要特征;同时利用某些平均阻抗和特征阻抗的一维各向同性介质反演亦可获得较为可信的电性分层界面。反演所获得之介质电导率可能为各主方向电导率主值的某种平均。

Abstract:

The one-dimensional anisotropic medium inversion for magnetotelluric data from 10 observational sites distributed in Tianzhou-Yongdeng region is studied and compared with the results of the two-dimensional symmetrical anisotropic medium inversion in the same region.It shows that in most cases the one-dimentional anisotropic inversion could also reveal the main characters of conductivity anisotropic structure of earth's crust. Meanwhile the one-dimensional isotropic inversion could obtain reliable electrical layer boundaries by using some average and characteristic impendences,if the method is suitable.The crustal medium conductivity obtained by the inversion probably is some averagerage value of two principal directions.