Software for 3D Inversion of EM Geophysical Data

该项目的重点是支持和扩展“ModEM”的能力，ModEM是俄勒冈州州立大学在过去几年中开发的电磁地球物理数据反演模块化系统。 该代码已被应用于一系列电磁地球物理数据集的反演，包括二维和三维大地电磁（MT），全球深地幔电导率研究的地磁观测数据，以及简单的受控源EM，并在初始开发阶段向专家学术用户提供了初步版本。 通过这个项目，我们正在扩展和“强化”ModEM，并维护和支持其在更广泛的用户社区中的使用。 我们最初的主要重点是支持3D MT功能（在ModEM中开发得最多，并且具有最大的学术兴趣），但我们也在ModEM的更一般功能的基础上构建，以支持CSEM数据的反演，以及多种EM（最终是其他）数据类型的联合反演。 除了软件的开发和维护，我们还提供使用培训，提供3D MT反演和解释的短期课程，并保持网络存在，ModEM用户社区可以与我们讨论，并相互讨论出现的问题和解决方案。使ModEM广泛提供给最广泛的社区，支持进一步的发展，并为教育和社区互动提供资源，所有这些都大大有助于正在进行的EM地球物理学3D革命，这将最终使基础和应用地球科学的新发现。 先进的反演代码的广泛和免费的可用性促进了有经验的3-D反演用户社区的扩展，并将加速在这个社区内理解这些现在新颖的3-D解释方法的适当用途（和限制）的发展。 EM方法在工业和应用环境科学中具有重要的应用。 该项目正在帮助发展这些应用程序的能力，支持开发实用和强大的软件以及知识渊博和训练有素的用户。

The focus of this project is on supporting and extending capabilities of "ModEM", a modular system for inversion of electromagnetic (EM) geophysical data which has been developed over the past few years at Oregon State University. The code has been applied to inversion of a range of EM geophysical datasets, including 2D and 3D magnetotellurics (MT), geomagnetic observatory data for global deep mantle conductivity studies, and simple controlled source EM, and preliminary versions were made available to expert academic users during the initial development phase. Through this project we are extending and "hardening" ModEM, and maintaining and supporting its use for a broader community of users. Our primary initial focus is on support of 3D MT capabilities (which are most developed in ModEM, and of the greatest academic interest), but we are also building on the more general capabilities of ModEM to support inversion of CSEM data, and joint inversion of multiple EM (and ultimately other) data types. In addition to development and maintenance of software, we provide training in its use, offering short courses on 3D MT inversion and interpretation, and maintaining a web presence where the community of ModEM users can discuss with us, and each other, problems and solutions as they arise. Making ModEM widely available to the broadest community possible, supporting further development, and providing resources for education and community interaction, all contribute substantially to the ongoing 3D revolution in EM geophysics, which will ultimately enable new discoveries in basic and applied Earth science. Wide and free availability of advanced inversion codes facilitates expansion of the community of experienced 3-D inversion users, and will accelerate development within this community of understanding of the appropriate uses (and limitations) of these now novel 3-D interpretation methods. EM methods have important applications in industry and in the applied environmental sciences. This project is helping to develop capacity for these applications, supporting development of practical and robust software and knowledgeable and trained users.