引言进行深部大地电磁测深,旨在研究地壳和上地幔的电导率。研究的主要目标是地壳与软流圈中由于脱水和部分熔融过程形成的高导电带。在深部大地电磁测深资料解释中,碰到三个主要问题:(1)我们怎样才能分离深部与近地表影响?在分析大地电磁曲线之前,应当消除或者至少是降低沉积断面和结晶基底中的地电非均匀性(或大洋中的海底地形非均匀性)带来的 INTRODUCTION Deep magnetotellurics is conducted to study the conductivity of the crust and the upper mantle. The main objective of the study is the high conductivity of the crust and asthenosphere due to dehydration and partial melting. There are three major problems encountered in the interpretation of deep MT data: (1) How can we separate the deep and near-surface effects? Before analyzing the MT curve, we should either eliminate, or at least reduce, the sedimentary section and crystalline basement Geoelectricity inhomogeneities (or oceanic topographic heterogeneities)