Three-Dimensional Joint Inversion of Magnetotelluric and Seismic Traveltime Data with Cross-Gradient Constraints
详细信息
- 责任者：Peng Miao (State Key Laboratory for Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Science ; Beijing 100037 ; China) ; Tan Handong
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(8)
- 关键词：大地电磁测深 ; telluric electromagnetic sounding ; 反演问题 ; inverse problem ; 地震勘探 ; seismic exploration
- 页码：p.2728-2738
- 图表：5 illus., 38 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
To effectively overcome the weak consistency of single inversion of magnetotelluric(or teleseismic travel time data),and also to solve the limitations of petrophysical approach,we study a three-dimensional joint inversion algorithm of magnetotelluric and seismic travel time data with cross-gradient constraints.Based on well-developed three-dimensional teleseismic and magnetotelluric forward and inversion algorithms,a three-dimensional joint inversion algorithm having common inversion grids,with cross-gradient as structural constraint,and with both resistivity and velocity models able to be simultaneously obtained has been achieved.With synthetic data from a single-prism model and two double-prism models,trial computation of joint inversion has been carried out,and the results indicate that,compared with single inversion,joint inversion has better effect in recovering both single prism’s and double-prism’s spatial morphology.The resistivity value of the single-prism is much closer to the true model in joint inversion,while by double-prism models,joint inversion not only removes false resistivity anomaly of wall rock to a certain degree,but also has large improvement on increasing the resolution of P-wave deep structure of anomalous body.Moreover,joint inversion improve the separate inversion results when resistivity and velocity is incompatible,indicating the cross-gradient is not be restricted on the relationship of different petrophysical parameters,but rather focuses on structural similarity and thus has wide applicability.