Pseudo‐Three‐Dimensional Magnetotelluric Inversion Using Nonlinear Conjugate Gradients
Pseudo‐Three‐Dimensional Magnetotelluric Inversion Using Nonlinear Conjugate Gradients
复制标题
DOI：
10.1002/cjg2.934
复制
发表时间：
2006-07
期刊：
影响因子：
--
通讯作者：
Zuzhi Hu;Xiang-yun Hu;Zhangxiang He
中科院分区：
文献类型：
--
作者：
Zuzhi Hu;Xiang-yun Hu;Zhangxiang He
提出了一种非线性共轭梯度法大地电磁拟三维反演方法。选择共轭梯度法作为反演核。在计算灵敏度矩阵时，我们计算1-D灵敏度，而不是计算3-D灵敏度。由于非台站的灵敏度元素为零，这应该是不可忽略的值，我们采用了近似的方法。在第一次求逆后，用拟牛顿法更新灵敏度矩阵。伪三维MT反演可以大大节省计算时间。通过对模拟数据和真实的数据的反演结果表明，拟三维MT反演是可靠和可行的。
We propose a nonlinear conjugate gradient algorithm for pseudo-3-D MT inversion. The conjugate gradient method is selected as the inversion kernel. When calculating sensitivities matrix, instead of computing 3-D sensitivities, we compute 1-D sensitivities. Since the sensitivity elements of non-stations are zero, which should be non-negligible values, we adopt a method of approximation. We update sensitivity matrix by the quasi-Newton method after the first inversion. Pseudo-3-D MT inversion can save computational time greatly. Inversion results of a synthetic data set and real data set show that the pseudo-3-D MT inversion is reliable and feasible.