@article{MTMT:36274590, title = {Impacts of Damage on Stress and Load Path Dependence of Dynamic Moduli of Granite}, url = {https://m2.mtmt.hu/api/publication/36274590}, author = {Knippel, Erik P and Hampton, Jesse C}, doi = {10.1093/gji/ggaf279}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {242}, unique-id = {36274590}, issn = {0956-540X}, abstract = {The stress and load path dependencies of elastic properties and their evolution under varying damage states is of critical interest to a multitude of communities, such as geophysicists understanding rock properties for subsurface engineering as well as both civil and geological engineers interested in fundamental damage mechanics of materials. Here, we perform a set of laboratory experiments on a Dakota Mahogany granite to understand the dependence of stress path, orientation, and magnitude on static and dynamic properties as well as dynamic evolution under varying states of damage. Localized strain and ultrasonic velocity, axial and radially aligned with respect to the sample, are recorded along four distinct load paths with varying ratios of mean and differential stress. Differential stress is found to be the predominant factor for variations in static Youngs modulus, while undamaged axial dynamic Youngs modulus is primarily a factor of increasing mean stress. Radial dynamic Young’s modulus demonstrates an overall positive correlation with increasing mean stress and negative correlation with differential stress. A novel relationship is constructed to predict phase velocity and orientation/polarization as a function of stress and load path. The effect of damage within the material is analyzed by subjecting the sample to increasing stresses along a single load path, after which the multipath testing is repeated. Ultrasonic velocity and thus dynamic moduli become less sensitive to increases in differential stress for wave propagation parallel with the maximum principle stress. For P-wave velocity aligned parallel, the contribution of differential stress decreases from nearly that of confining pressure (0.88) to below half at the highest damage state tested. Similar decreases also occur in the contribution of differential stress to the remaining three wave polarizations and orientations. This shows that the degradation of physical properties brought about by microcracking and subsequent decrease in velocity overcomes any increase resulting from consolidation with increasing stress. The results provide a way to anticipate changes in elastic response and subsurface acoustic velocity brought about by increased damage and changing stress state through the use of a new empirical model. Additional methods to establish the distribution of microcracks and their orientations within a damaged material through differences in velocity from loading to unloading are presented which provide useful tools for non-destructively assessing damage state.}, year = {2025}, eissn = {1365-246X}, pages = {1}, orcid-numbers = {Hampton, Jesse C/0000-0001-8568-3100} } @article{MTMT:35816800, title = {Structural analysis of gravity and magnetic data: implication for groundwater study in the Ziway, Abijata and Langano lakes corridor and surroundings, central main Ethiopian rift}, url = {https://m2.mtmt.hu/api/publication/35816800}, author = {Moges, Getnet and Alemu, Abera and Ejepu, Jude}, doi = {10.1093/gji/ggae461}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35816800}, issn = {0956-540X}, keywords = {Fourier Analysis; Magnetic Anomalies; Hydrogeophysics; Gravity anomalies and Earth structure; Satellite gravity; Fractures and Faults}, year = {2025}, eissn = {1365-246X}, pages = {1505-1522} } @article{MTMT:35866884, title = {Intraplate seismicity in southwestern Norway: enhanced catalogue highlights diffusive earthquake occurrence linked to inherited weakness zones}, url = {https://m2.mtmt.hu/api/publication/35866884}, author = {Marck, Angelique and Ottemoller, Lars and Rondenay, Stephane and Fossen, Haakon}, doi = {10.1093/gji/ggaf018}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35866884}, issn = {0956-540X}, keywords = {Europe; machine learning; Seismicity and tectonics; Intra-plate processes}, year = {2025}, eissn = {1365-246X}, pages = {2006-2022} } @article{MTMT:35885896, title = {Predictive modelling of seismic wave fields: learning the transfer function using encoder-decoder networks}, url = {https://m2.mtmt.hu/api/publication/35885896}, author = {Klinge, Jana and Schippkus, Sven and Walda, Jan and Hadziioannou, Celine and Gajewski, Dirk}, doi = {10.1093/gji/ggaf004}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35885896}, issn = {0956-540X}, keywords = {machine learning; Wave propagation; TIME-SERIES ANALYSIS; Seismic noise; Seismic interferometry}, year = {2025}, eissn = {1365-246X}, pages = {1611-1621}, orcid-numbers = {Gajewski, Dirk/0000-0001-5861-9031} } @article{MTMT:35937029, title = {Volumetric (dilatant) plasticity in geodynamic models and implications on thermal dissipation and strain localization}, url = {https://m2.mtmt.hu/api/publication/35937029}, author = {Momoh, Ekeabino and Bhat, Harsha S. and Tait, Stephen and Gerbault, Muriel}, doi = {10.1093/gji/ggae463}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35937029}, issn = {0956-540X}, keywords = {Numerical modelling; Mechanics, theory, and modelling; Heat generation and transport}, year = {2025}, eissn = {1365-246X}, pages = {1551-1578}, orcid-numbers = {Momoh, Ekeabino/0000-0002-7780-9401} } @article{MTMT:35951703, title = {Identifying geological structures in the Pamir region using non-subsampled shearlet transform and gravity gradient tensor}, url = {https://m2.mtmt.hu/api/publication/35951703}, author = {Duan, Hurong and Wang, Wei and Xing, Lelin and Xie, Baopeng and Zhang, Qi and Zhang, Yerui}, doi = {10.1093/gji/ggaf036}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35951703}, issn = {0956-540X}, keywords = {wavelet transform; Gravity anomalies and Earth structure; Fractures, faults, and high strain deformation zones}, year = {2025}, eissn = {1365-246X}, pages = {2125-2143} } @article{MTMT:36287499, title = {Theory and simulation for low-frequency interfacial polarization of plant root cell}, url = {https://m2.mtmt.hu/api/publication/36287499}, author = {Izumoto, S. and Nguyen, F.}, doi = {10.1093/gji/ggaf110}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {241}, unique-id = {36287499}, issn = {0956-540X}, abstract = {The intricate architecture of plant root systems is crucial for nutrient and water uptake, significantly influencing plant growth and productivity. Induced polarization is a promising non-destructive technique for analysing plant roots in their natural conditions. This study introduces a novel theoretical and numerical model to explain the significant low-frequency polarization of plant root cells observed in previous experiments. Our approach addresses the limitations of existing models by incorporating geometric constraints and internal mechanisms of cell polarization, particularly focusing on interfacial polarization across the cell membrane. Through comprehensive simulations, we investigate various geometries and boundary conditions, demonstrating that densely packed root cells exhibit significant polarization signals within a measurable frequency range due to coupling effects. Our findings align with experimental observations, indicating that the peak frequency is highly sensitive to cell arrangement and membrane properties, while the maximum phase shift remains consistent. This model provides a robust framework for interpreting polarization signals in root systems, offering potential applications for in-situ characterization of plant roots and enhancing the understanding of root dynamics under different environmental conditions. © The Author(s) 2025.}, keywords = {Stem Cells; Numerical modelling; computer simulation; PLANT; Plants (botany); ROOT; nutrient uptake; Plant Roots; Plant Diseases; plant cell culture; water uptake; digital elevation model; numerical model; boundary condition; Numerical models; induced polarization; induced polarization; induced polarization; Hydrogeophysics; Hydrogeophysics; Interfacial polarization; Lower frequencies; Root cells; Polarization signals; Induced polarization logging; Plant root system}, year = {2025}, eissn = {1365-246X}, pages = {1632-1647} } @article{MTMT:35893718, title = {Physical link between effective viscosity and electrical resistivity for dislocation creep in upper mantle and its application in Northwest Xinjiang, China}, url = {https://m2.mtmt.hu/api/publication/35893718}, author = {Li, Man and Xu, Yixian and Liu, Lian and Yang, Bo and Zhang, Yi and Zhu, Yixin and Liu, Shuyu}, doi = {10.1093/gji/ggae438}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35893718}, issn = {0956-540X}, keywords = {Asia; magnetotellurics; Composition and structure of the mantle; Plasticity, diffusion, and creep}, year = {2025}, eissn = {1365-246X}, pages = {1295-1307}, orcid-numbers = {Li, Man/0009-0002-1464-1995; Xu, Yixian/0000-0002-1864-2058; Liu, Lian/0000-0002-0119-333X} } @article{MTMT:36312610, title = {Evaluation of a generalized least squares algorithm for infrasound beamforming with coherent background noise}, url = {https://m2.mtmt.hu/api/publication/36312610}, author = {Bishop, JW and Blom, PS and Webster, J}, doi = {10.1093/gji/ggaf203}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {242}, unique-id = {36312610}, issn = {0956-540X}, abstract = {Infrasonic signals of interest can occur during periods with persistent, coherent, background noise, which may be natural or anthropogenic. For high signal-to-noise (SNR) ratio transient signals, an ‘overprinting’ of the coherent background may occur, and the signal may still be detected. However, this approach fails for low SNR signals of interest, which may be obscured by coherent noise. An infrasound beamforming method based on generalized least squares (GLS) is investigated for detecting transient signals of interest in the presence of coherent and incoherent background noise. This approach relies on an estimate of the noise covariance, captured in a covariance matrix, to effectively null contributions to the array response from noisy directions of arrival. Synthetic array data is used to investigate the performance of the GLS beamformer compared to the Bartlett beamformer when coherent and incoherent backgrounds are present. Additionally, the effects of array element number and relative strength of the interfering signal on the GLS estimates is investigated. GLS empirical area under the curve estimates suggest that the beamformer can recover coherent power for a signal of interest lower in amplitude than the coherent background, but this effectiveness degrades more quickly with SNR for a four element array compared to a six or eight element infrasound array. Finally, infrasound from the Forensic Surface Experiment, a bolide signal observed at IMS array I37NO, and a volcanic signal recorded at the Alaska Volcano Observatory array ADKI are used to evaluate GLS performance on recorded data. A ten minute window was used to capture the background noise, and the coherent background signal was nulled in all three examples.}, year = {2025}, eissn = {1365-246X}, orcid-numbers = {Bishop, JW/0000-0002-8940-9827; Blom, PS/0000-0003-3946-0736} } @article{MTMT:35750306, title = {The effective elastic thickness along the Emperor Seamount Chain and its tectonic implications}, url = {https://m2.mtmt.hu/api/publication/35750306}, author = {Watts, Anthony B and Wessel, Pål and Xu, Chong}, doi = {10.1093/gji/ggae372}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {240}, unique-id = {35750306}, issn = {0956-540X}, abstract = {The Hawaiian–Emperor Seamount Chain, a pre-eminent example of a hotspot-generated intraplate seamount chain, provides key constraints not only on the kinematics of plates but also on their rigidity. Previous studies have shown that the effective elastic thickness, Te, a proxy for the long-term strength of the lithosphere, changes abruptly at the Hawaiian–Emperor ‘bend’ from low values (∼16 km) at the Emperor Seamounts to high values (∼27 km) at the Hawaiian Ridge. To better constrain Te along the poorly explored Emperor Seamounts we have used a free-air gravity anomaly and bathymetry gridded data set, together with fully 3-D elastic plate (flexure) models, to estimate the continuity of Te and volcano load and infill densities along 1000 profiles spaced 2 km apart of the chain. Results show that Te generally decreases northwards along the chain. The decrease is most systematic between Ojin and Jimmu guyots where Te depends on the age of the lithosphere at the time of volcano loading and is controlled by the 340 and 400 °C oceanic isotherms. The largest variation from these isotherms occurs at the northern and southern ends of the chain where Te is smaller than expected suggesting the influence of pre-existing, older, loads. We use these results to constrain the subsidence, flexural tilt, rheological properties and tectonic setting along the seamount chain. We found an excess subsidence in the range 1.2–2.4 km, a tilt as large as 2–3°, oceanic lithosphere that is weaker than it is seawards of the weak zone at subduction zones, and a tectonic setting at Detroit and Koko seamounts that, despite their forming an integral part of the hotspot generated seamount chain, retains a memory of their proximity to earlier loads associated with plume influenced mid-oceanic ridges.}, year = {2025}, eissn = {1365-246X}, pages = {61-80} }