EHS3D-MT数据的RRMC统一处理与反演解释

从2004年开始，EHS3D项目在科学基金的持续支持下已经开展了连续13年的观测，截至2017年年底，共完成宽频带大地电磁（BMT）测点2064个(测线长度20130km,平均点距10km)；完成长周期大地电磁（LMT）测点603个(测线长度17970km,平均点距30km)。这些宝贵的数据为EHS3D项目下一步建立三维模型奠定了坚实的基础。在项目的执行过程中，我们随时对发现和遇到的问题进行了研究，比如静态位移、畸变、长周期数据的处理方法以及与宽频带的衔接等。但由于我国经济建设的快速发展，环境噪音逐年增大，特别是工业干扰造成的近场效应已经成为数据处理中不可回避的难题。本项目提出采用目前最有效的磁场约束远参考技术（RRMC）对数据进行统一处理解释，压制近场干扰的影响，提高数据处理的质量，在此基础上，最后将通过三维反演建立青藏高原东部完整的三维模型.

Sponsored by the NSFC since 2004, the project EHS3D (3D deep structures and dynamics in Eastern Himalayan Syntaxis and surroundings) conducted continuous measurements in eastern Tibet for 13 years. By the end of 2017,BMT(Broad band Magnetotelluric) and LMT (Long period Magnetotelluric) data have been collected at 2064 sites (total length 20130km, average site spacing 10km)and 603 sites (total length 17970km, average site spacing 30km) respectively. The valuable data make it possible for a 3D model of the area. During the past years, problems in the static shifts, distortions and LMT data processing were studied in detail for upgrading the data quality. While due to the fast development of China’s economy and industry, the noise level, especially the near field effects have been becoming a severe problem in the field data. This project proposes to reprocess the data using an advanced technique RRMC (Remote Reference with Magnetic Control) developed by the Russian colleagues. RRMC has been tested by our field data and produced good results. Finally, the dynamics of the lithosphere deformation of eastern Tibet will be explored based on the full 3D model.