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The OGS-Eclipse code for simulation of coupled multiphase flow and geomechanical processes in the subsurface
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- Computational Geosciences
, 2020-05-12)
This paper presents a numerical simulation tool for the analysis of coupled processes related to subsurface operations. The tool combines the open-source scientific code OpenGeoSys with the reservoir simulator Eclipse ...
Seismicity in the Northern Rhine Area (1995–2018)
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- Journal of Seismology
, 2020-12-16)
Since the mid-1990s, the local seismic network of the University of Cologne has produced digital seismograms. The data all underwent a daily routine processing. For this study, we re-processed data of almost a quarter ...
Brittle anisotropic fracture propagation in quartz sandstone: insights from phase-field simulations
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- Computational Geosciences
, 2020-04-19)
We developed a generalized multiphase-field modeling framework for addressing the problem of brittle fracture propagation in quartz sandstones at microscopic length scale. Within this numerical approach, the grain boundaries ...
Seiscloud, a tool for density-based seismicity clustering and visualization
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- Journal of Seismology
, 2020-05-07)
Clustering algorithms can be applied to seismic catalogs to automatically classify earthquakes upon the similarity of their attributes, in order to extract information on seismicity processes and faulting patterns out of ...
Validation and calibration of coupled porous-medium and free-flow problems using pore-scale resolved models
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- Computational Geosciences
, 2020-09-05)
The correct choice of interface conditions and effective parameters for coupled macroscale free-flow and porous-medium models is crucial for a complete mathematical description of the problem under consideration and for ...
Understanding Micropolar Theory in the Earth Sciences I: The Eigenfrequency $\omega_r$
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- Pure and Applied Geophysics
, 2021-12-25)
Even though micropolar theories are widely applied for engineering applications such as the design of metamaterials, applications in the study of the Earth’s interior still remain limited and in particular in seismology. ...
Understanding Micropolar Theory in the Earth Sciences II: The Seismic Moment Tensor
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- Pure and Applied Geophysics
, 2021-11-05)
Seismic events produced by block rotations about vertical axis occur in many geodynamic contexts. In this study, we show that these rotations can be accounted for using the proper theory, namely micropolar theory, and a ...
Efficient solution techniques for two-phase flow in heterogeneous porous media using exact Jacobians
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- Computational Geosciences
, 2020-10-10)
Two efficient and scalable numerical solution methods will be compared using exact Jacobians to solve the fully coupled Newton systems arising during fully implicit discretization of the equations for two-phase flow in ...
Combined seismic and borehole investigation of the deep granite weathering structure—Santa Gracia Reserve case in Chile
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- Earth Surface Processes and Landforms
, 2022-08-15)
Imaging the critical zone at depth, where intact bedrock transforms into regolith, is critical in understanding the interaction between geological and biological processes. We acquired a 500 m‐long near‐surface seismic ...
Melt Production and Ejection From Lunar Intermediate‐Sized Impact Craters: Where Is the Molten Material Deposited?
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- Journal of Geophysical Research: Planets
, 2022-08-06)
Differently aged impact melt in lunar samples is key to unveiling the early bombardment history of the Moon. Due to the mixing of melt products ejected from distant craters, the interpretations of the origin of lunar samples ...