Joint inversion of two-dimensional magnetotelluric and surface wave dispersion data with cross-gradient constraints
Joint inversion of two-dimensional magnetotelluric and surface wave dispersion data with cross-gradient constraints
复制标题
交叉梯度约束下二维大地电磁波和面波频散数据联合反演
DOI：
10.1093/gji/ggaa045
复制
发表时间：
2020
影响因子：
2.8
通讯作者：
Ran Zhengwen
中科院分区：
文献类型：
--
作者：
Wu Pingping;Tan H;ong;Lin Changhong;Peng Miao;Ma Huan;Ran Zhengwen
数据反演的多物理成像在许多科学和工程分支中具有越来越重要的作用。交叉梯度约束被认为是一种可行的方法，可以通过从多个地球物理数据中找到几何一致的图像来减少反演过程中固有的非唯一性问题。基于OCCAM算法，提出了一种利用面波频散数据直接反演二维剖面速度结构的方法。然后利用交叉梯度约束联合反演大地电磁和面波频散数据的剖面。提出了三种综合模型，包括速度和电阻率间断一致或不一致的块状均匀模型和非均匀模型，以衡量联合反演方案的性能。我们发现，由于两个地球物理数据集的优势互补，构造耦合约束恢复的模型在复杂地质单元的分类中表现出更高的分辨率，并解决了单独反演方法带来的一些成像问题。最后，利用青藏高原东北部的一个实际速度模型和经验法计算的相应的电阻率模型，验证了联合反演方案在实际地质环境中的有效性。
Multiphysics imaging for data inversion is of growing importance in many branches of science and engineering. Cross-gradient constraint has been considered as a feasible way to reduce the non-uniqueness problem inherent in inversion process by finding geometrically consistent images from multigeophysical data. Based on OCCAM inversion algorithm, a direct inversion method of 2-D profile velocity structure with surface wave dispersion data is proposed. Then we jointly invert the profiles of magnetotelluric and surface wave dispersion data with cross-gradient constraints. Three synthetic models, including block homogeneous or heterogeneous models with consistent or inconsistent discontinuities in velocity and resistivity, are presented to gauge the performance of the joint inversion scheme. We find that owning to the complementary advantages of the two geophysical data sets, the models recovered with structure coupling constraints exhibit higher resolution in the classification of complex geologic units and settle some imaging problems caused by the separate inversion methods. Finally, a realistic velocity model from the NE Tibetan Plateau and its corresponding resistivity model calculated by empirical law are used to test the effectiveness of the joint inversion scheme in the real geological environment.