Geophysical methods are widely used to gather information about the subsurface as they are non-intrusive and comparably cheap. However, the solution to the geophysical inverse problem is inherently non-unique, which introduces considerable uncertainties. As a partial remedy to this problem, independently acquired geophysical data sets can be jointly inverted to reduce ambiguities in the resulting multi-physical subsurface images. A novel cooperative inversion approach with joint minimum entropy constraints is used to create more consistent multiphysical images with sharper boundaries with respect to the single-method inversions. Here, this approach is implemented in an open-source software and its applicability on electrical resistivity tomography (ERT), seismic refraction tomography (SRT), and magnetic data is investigated. A synthetic 2D ERT and SRT data study is used to demonstrate the approach and to investigate the influence of the governing parameters. The findings showcase the advantage of the joint minimum entropy (JME) stabilizer over separate, conventional smoothnessconstrained inversions. The method is then used to analyze field data from Rockeskyller Kopf, Germany. 3D ERT and magnetic data are combined and the results confirm the expected volcanic diatreme structure with improved details. The multi-physical images of both methods are consistent in some regions, as similar boundaries are produced in the resulting models. Because of its sensitivity to hydrologic conditions in the subsurface, observations suggest that the ERT method senses different structures than the magnetic method. These structures in the ERT result do not seem to be enforced on the magnetic susceptibility distribution, showcasing the flexibility of the approach. Both investigations outline the importance of a suitable parameter and reference model selection for the performance of the approach and suggest careful parameter tests prior to the joint inversion. With proper settings, the JME inversion is a promising tool for geophysical imaging, however, this work also identifies some objectives for future studies and additional research to explore and optimize the method.

Anton H. Ziegon

Marc S. Boxberg

Florian M. Wagner

Journal of Applied Geophysics

《应用地球物理学杂志》的主要目标是响应相关和及时的需求，特别强调解决环境、工程和水文问题的地球物理技术的方法开发和创新应用。 《应用地球物理学杂志》也涵盖了勘探地球物理学以及土壤和岩石物理学方面的相关专题研究。

The Journal of Applied Geophysics aims to address relevant and timely needs, with a particular emphasis on the development and innovative application of geophysical techniques to solve environmental, engineering, and hydrological problems. Additionally, the journal covers related research topics in exploration geophysics as well as soil and rock physics.

《Journal of Applied Geophysics》旨在满足相关和及时的需求，特别强调开发和创新应用地球物理技术，以解决环境、工程和水文问题。此外，该期刊还涵盖了勘探地球物理学以及土壤和岩石物理学的相关研究。

Category	Quartile
地球科学	3
地球科学, 矿业与矿物加工	3
地球科学, 地球科学综合	4

Minimum entropy constrained cooperative inversion of electrical resistivity, seismic and magnetic data

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Journal Info

Category	Quartile
MINING & MINERAL PROCESSING	2