表面局部三维大地电磁曲线畸变校正——MT畸变校正阻抗张量分解方法

THE CORRECTION OF MAGNETOTELLURIC CURVE DISTORTION CAUSED BY SURFICIAL LOCAL THREE-DIMENSION INHOMOGENEITIES:THE IMPEDANCE TENSOR DECOMPOSITION TECHNIQUE FOR THE CORRECTION OF MT CURVES DISTORTION

针对三维/二维地质结构开发了大地电磁阻抗张量分解技术,利用该技术仅需对各个独立测点的大地电磁资料进行分析即可分离和消除由三维局部异常体引起的其附近测点的 MT 响应函数的形态扭曲畸变.通过理论模型实验,证明了阻抗张量分解技术能够有效地校正三维/二维情况下三维异常体所造成的 MT 响应函数的形态畸变.

Just for 3-D/2-D geological structures,the decomposition technique of MT impedance tensor is developed.It can separate and remove the twist distortion of MT corresponse function shape re- suiting from 3-D local abnormal objects near surveying site by using the technique to analyze the MT data of each independent site.The theoretical model tests in this paper have shown the effec- tiveness of the technique in removing the local distortion.