CAJ | 학술논문

采用积分方程法计算均匀半空间中三维异常体的大地电磁响应,然后利用阻尼最小二乘法反演得到地下三维异常体电阻率分布.在计算灵敏度矩阵时,将灵敏度矩阵分为线性项和体现反演过程非线性的偏微分项进行求解,提高了计算精度.理论模型反演结果表明,反演较准确,对初值依赖性小,且只针对异常体剖分单元进行反演,反演效率较高.
채용적분방정법계산균균반공간중삼유이상체적대지전자향응,연후이용조니최소이승법반연득도지하삼유이상체전조솔분포.재계산령민도구진시,장령민도구진분위선성항화체현반연과정비선성적편미분항진행구해,제고료계산정도.이론모형반연결과표명,반연교준학,대초치의뢰성소,차지침대이상체부분단원진행반연,반연효솔교고.
This paper calculates the 3D magnetotelluric responses in homogeneous half space using integral equation method and apply the damped least square method to inverse the resistivity of 3D model. When calculating sensitivities matrix, we decompose the sensitivities matrix into linear and nonlinear partial differentia terms for precise calculation. The inversion result shows that the inversion algorithm is right and does not rely on the initial value very much, furthermore the inversion has high efficiency because it only inverses the dissected unit.