Three-dimensional joint inversion for magnetotelluric and seismic traveltime data using cross-gradient coupling

详细信息    查看全文 | 下载全文 | 推荐本文 |

• 作者：PENG MiaoTAN HandongJIANG MeiQIAN HuiTAN Jiayan
• 会议时间：2013-10-14
• 关键词：Joint inversion ; Cross-gradient ; Magnetotelluric ; Seismic traveltime
• 作者单位：PENG Miao,JIANG Mei,QIAN Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing,China)TAN Handong,TAN Jiayan(School of Geophysics and Information Technology,China University of Geosciences,Beijing,China)
• 母体文献：第十一届中国国际地球电磁学术讨论会论文集
• 会议名称：第十一届中国国际地球电磁学术讨论会
• 会议地点：乌鲁木齐
• 主办单位：中国地球物理学会
• 语种：chi

摘要

We put forward a three-dimensional joint inversion algorithm framework for magnetotelluric data and seismic traveltime data using a cross-gradient coupling method.Based on a well-developed three-dimensional magnetotelluric staggered-grid finite difference forward algorithm and an eikonal-equation-based seismic FMM (fast marching method) traveltime ray tracing algorithm, 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 pairs from single prism model, 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 single prism's spatial morphology and true values, and also enhances the velocity features in the deep part of the single prism.