Journal of Structural Geology最新文献

{"title":"Late Quaternary left-slip rate of the Dangjiang segment along the Ganzi-Yushu-Xianshuihe Fault Zone in the central Tibetan Plateau and the tectonic implications","authors":"Zhongyuan Yu ,&nbsp;Baixu Chen ,&nbsp;Ping Song ,&nbsp;Qi Zhao ,&nbsp;Yicheng Wang ,&nbsp;Wenxuan Wang","doi":"10.1016/j.jsg.2025.105359","DOIUrl":"10.1016/j.jsg.2025.105359","url":null,"abstract":"<div><div>The Dangjiang segment, as the northwestern extremity of the NW-NNW-trending sinistral-slip Ganzi-Yushu-Xianshuihe Fault Zone (GYXFZ) in the central Tibetan Plateau, plays an important role in absorbing strain and regulating the relative movement between active blocks of the Tibetan Plateau interior. However, the late Quaternary strike-slip rate of the Dangjiang segment has rarely been studied because of extreme weather and hypoxia in high-altitude areas (H &gt; 5000 m) and inconvenient transportation, which directly affects the scientific understanding of the tectonic deformation style and reasonable assessment of the strong earthquake hazard along the GYXFZ and the analysis of the present deformation characteristics and geodynamic process of the plateau. Therefore, this study investigated the active tectonics of the Dangjiang segment based on integrated data from high-resolution satellite interpretation, large-scale geomorphic and geological mapping, trench excavations, and Quaternary chronological dating. The results reveal that the Dangjiang segment branches into the main Dangjiang Fault and secondary Zhiduo Fault, both of which have experienced intensive left-strike slip with minor dip movement since the late Quaternary. By measuring offset tributary terraces of the Tongtian River using a UAV survey, and dating their abandonment age using OSL and 14C with the upper terrace model, the late Quaternary strike-slip rate of the Dangjiang Fault and the Zhiduo Fault were estimated at ∼6.9 ± 0.1 mm/a and ∼2.1 ± 0.2 mm/a, respectively. Both the linear fitting value and the slip decomposition model indicate that the strike-slip rate of ∼8–10 mm/a in the late Quaternary is more consistent with geological and geomorphic estimations as well as geodetic constraints along the GYXFZ, and that the late Quaternary slip rate (∼8–10 mm/a) is consistent with the long-term and average slip rates along the structure. This spatiotemporal variation suggests that the current tectonic deformation of the Tibetan Plateau interior may have been continuous and distributed.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"192 ","pages":"Article 105359"},"PeriodicalIF":2.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Quaternary activity of the Songgang Fault on the eastern Tibetan Plateau from geological and geomorphological evidence","authors":"Jiao Liu ,&nbsp;Mingjian Liang ,&nbsp;Guohong Zhang ,&nbsp;Renmao Yuan ,&nbsp;A.L. Strom ,&nbsp;Zhikun Ren ,&nbsp;Xinjian Shan","doi":"10.1016/j.jsg.2025.105348","DOIUrl":"10.1016/j.jsg.2025.105348","url":null,"abstract":"<div><div>The Late Quaternary activity characteristics of faults are essential for understanding regional strain distribution and estimating seismic hazards. The Bayan Har block, located in the northern Tibetan Plateau, is a region with a high level of seismic hazard. Remarkably, over the past three decades, many strong earthquakes have occurred on the block boundary fault zones of the Bayan Har block. However, the 2021 Ms 7.4 Maduo earthquake and the 2022 Maerkang Ms 6.0 earthquake swarm were exceptions as they took place within the Bayan Har block, not on the boundary fault zones. The reason for the occurrence of these intraplate earthquakes presents an interesting research query. The Songgang Fault (SGF) is a NW-trending strike-slip fault within the Bayan Har block. The 2022 Maerkang Ms 6.0 earthquake swarm occurred 6 km northeast of the SGF. What role did the SGF play in the process of the earthquake swarm? Through utilizing high-resolution remote sensing image interpretation, detailed field geological and geomorphologic surveys, trench analysis, and dating technologies, we found that the SGF is a sinistral strike-slip active fault since the Late Pleistocene, exhibiting tectonic behavior conducive to the preparation and occurrence of moderately large earthquakes. OSL dating of dislocated stream channels reveals a left-lateral slip rate of the SGF yields 1.6–2.1 mm/yr since the Late Pleistocene. The SGF distributes and transmits the tectonic deformation within the Bayan Har block, accommodating southeastward lateral extrusion of the Bayan Har block materials and contributing to the kinematic mechanisms of the entire eastern margin of the Tibetan Plateau. Furthermore, the 2022 Ms 6.0 Maerkang earthquake swarm exhibits a conjugate rupture phenomenon in a complex tectonic zone where several secondary fault planes of the SGF converge. This main fault zone deserves attention as a potential source zone of future earthquakes.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"194 ","pages":"Article 105348"},"PeriodicalIF":2.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quartz veins in the greenstone belts of Dharwar Craton (India) and their mineralization potential – A hypothesis","authors":"Santu Biswas,&nbsp;Arindam Sarkar,&nbsp;Abhijeet Suryawanshi,&nbsp;Manish A. Mamtani","doi":"10.1016/j.jsg.2025.105355","DOIUrl":"10.1016/j.jsg.2025.105355","url":null,"abstract":"<div><div>Structural geological investigations involving statistical analysis of mineralized vs. non-mineralized (barren) veins are important in mineral exploration. In this study, we statistically analyze orientation, thickness, and spacing data of veins intruding metavolcanic rocks of three regions of Eastern Dharwar Craton (EDC, southern India) - Hutti surface (6 transects), Raichur (5 transects), and Gadwal (6 transects). While gold mineralization is known to occur in parts of Archaean greenstone belts of the Dharwar Craton, vein data collected here are from areas with no reported gold deposit. Results from this study are compared with similar published data from gold-bearing and barren domains of the Gadag region in Western Dharwar Craton (WDC). Vein data are used to prepare a “mineralization potential plot” and calculate the mineralization potential parameter (M_d) for each transect. Whilst most transects in EDC have high M_d, implying low mineralization potential, a few transects have a low M_d and fall close to the cluster of points demarcating the mineralized domain of the Gadag region. This brings to light the limitations of the mineralization potential plot developed by earlier workers, which is discussed in this study. We discuss the importance of dispersion of M_d for multiple transects of a particular region in order to evaluate its true mineralization potential. It is noted that all data for EDC (this study), as well as the non-mineralized domain of Gadag (WDC) show high dispersion on the mineralization potential plot, while data from the mineralized domain of the Gadag are clustered (low dispersion) close to the origin. We have developed a “<em>mineralization potential standard deviation (MPSD) plot</em>”, where the mean M_d and its standard deviation (S_d) from multiple transects of the individual regions of EDC and WDC are plotted. This yields a <em>MPSD curve</em> following power law equation, which is unique to the data of quartz veins intruding metavolcanic rocks of the Dharwar Craton. We hypothesize that if data of quartz veins intruding metavolcanic rocks from any part of the Dharwar region are analyzed, a high mineralization potential will be indicated if data fall on this MPSD curve and close to the origin. We envisage that every region will have its unique MPSD curve, which can be prepared from vein data of a particular mineralogical phase intruding a specific lithology. It is concluded that the MPSD curve can be used to identify potential regions of mineralization.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"192 ","pages":"Article 105355"},"PeriodicalIF":2.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An application of quartz grain analyses in earthquake-induced (palaeo)liquefaction studies","authors":"Szymon Świątek ,&nbsp;Karolina Lewińska ,&nbsp;Małgorzata Pisarska-Jamroży ,&nbsp;Christina Günter","doi":"10.1016/j.jsg.2025.105357","DOIUrl":"10.1016/j.jsg.2025.105357","url":null,"abstract":"<div><div>This study investigates the micromorphological changes in quartz grains as a result of seismically-induced liquefaction and their potential for distinguishing seismogenic soft-sediment deformation structures from other trigger mechanisms. The experimental analysis revealed distinct subtle and pronounced quartz cracks, edge corrosion, and advanced grain defragmentation. The findings suggest that these quartz alterations are strongly influenced by the degree of water mineralisation and the duration of exposure on it. Moreover, the study identified gold forms within quartz cracks, which developed after seismic activity and serve as a direct evidence of such activity. These microstructures provide new insights into the role of seismicity in the redistribution and deposition of minerals. Geochemical conditions, including pH and Eh, also played a critical role in the sediment's liquefaction behaviour. Our results highlight how chemical interactions, combined with seismic forces, contribute to quartz grains damage. These findings provide a novel approach for identifying seismically-induced deformation structures and assessing past seismic events in sedimentary records. The results also emphasize the significance of integrating quartz grain analysis in seismic risk assessments, improving the understanding of liquefaction mechanisms and potential hazards.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"193 ","pages":"Article 105357"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating complete dyke dimensions from partial exposures","authors":"Sirshendu Kumar Biswas ,&nbsp;Tridib Kumar Mondal ,&nbsp;Avijit Saha ,&nbsp;Alaap Kumar Mukhopadhyay ,&nbsp;Archishman Mukherjee","doi":"10.1016/j.jsg.2025.105350","DOIUrl":"10.1016/j.jsg.2025.105350","url":null,"abstract":"<div><div>Knowledge of complete dyke dimensions is crucial to determine the actual aspect ratio which is indispensable in estimating their magma overpressure, depth of origin and even explosivity potential of fissure eruptions. A dearth of completely exposed dykes imposes considerable uncertainty on estimates of their aspect ratios. Therefore, we have pioneered a method of estimating complete dyke dimensions from their partial exposures lacking any tip. Considering dykes as dominantly opening mode fractures, the method is built upon the idealized canonical model of opening mode fractures and utilizes differential equation of ellipse, which is the predicted shape of fracture opening in the model, to estimate their full length, maximum width and aspect ratio from limited outcrop measurements. The validity of the method has been tested against ground data and published data. From its application to two partially exposed mafic dykes devoid of tips, one each from the Western and Eastern Dharwar Cratons of India we generated results from which we further calculate their magma overpressures and depths of origin. Although developed for dykes, the method has potential for wider application, since it can be used fundamentally to predict complete dimensions of any elliptical shaped natural features from their partial exposures.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"192 ","pages":"Article 105350"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of columnar joints and joint pattern on near-surface normal faulting: An analog modeling approach","authors":"Lisa Winhausen ,&nbsp;Antonia Czepl ,&nbsp;Michael Kettermann ,&nbsp;Christoph von Hagke ,&nbsp;Janos L. Urai","doi":"10.1016/j.jsg.2025.105354","DOIUrl":"10.1016/j.jsg.2025.105354","url":null,"abstract":"<div><div>Normal faults at mid-ocean ridges develop massively dilatant structures close to the surface. Situated close to plate boundaries, these faults form in volcanic rocks such as basalt, which are characterized by columnar joints. These joints cause an orthotropic mechanical behavior of the rock mass, characterized by contrasting strong intact rock and weak, low-cohesion joint networks. To date, the influence of these columnar joints on the geometry and evolution of near-surface normal faults remains poorly understood. We present an analog modeling approach utilizing new analog modeling materials: i) layers of desiccated cornstarch forming drying cracks and resembling layered columnar joints in basaltic lava flows, and ii) systematically stacked blocks representing different joint patterns with varying block overlaps above vertical cooling joints. The geometric scaling of these models allows to assess the near-surface structures in the upper 50–150 m. The models reveal that fault formation is dominated by opening mode displacement reactivating the pre-existing joints and the style of deformation changes with progressive localization of the main fault. Observed structural features such as a tilted block bound between a main and antithetic fault, relay ramps, vertical mass transfer, and open cavities transfer well to the natural prototypes. Our newly developed experiments form a basis for future studies exploring fault processes in jointed rock masses.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"192 ","pages":"Article 105354"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Displacement analysis of basin-scale reactivated normal faults: Insights from the West Netherlands Basin","authors":"Annelotte Weert ,&nbsp;Giovanni Camanni ,&nbsp;Marco Mercuri ,&nbsp;Kei Ogata ,&nbsp;Francesco Vinci ,&nbsp;Stefano Tavani","doi":"10.1016/j.jsg.2025.105356","DOIUrl":"10.1016/j.jsg.2025.105356","url":null,"abstract":"<div><div>Displacement-distance diagrams are valuable for studying fault interactions and growth. Examples of displacement patterns for faults that underwent multiple reactivation events are limited. This study presents along-strike and along-dip displacement-distance diagrams for nine basin-scale faults from the West Netherlands Basin, which has experienced multiple phases of displacement. The diagrams were derived from 3D seismic reflection data, covering 2300 km² and 6 km in depth. Due to the dataset size, we developed a semi-automated workflow to map faults, reduce noise, and generate displacement-distance diagrams. To determine the effects of both multiphase rifting and transpressive basin inversion on fault growth, we studied four faults only recording extensional events and five faults that also experienced inversion. We observed distinctive along-dip displacement patterns, characterized by piecewise curves, identifying pre-, syn-, and post-rift phases of fault growth, as well for a later inversion event. The shape of lateral displacement patterns suggests quasi-fixed lateral fault tips throughout the fault's history and faults developing their lateral lengths early, with later reactivation mainly increasing their vertical extent while accumulating displacement. In addition to improving our understanding of how faults grow through multiple reactivations, these results may provide insights into the growth-history of faults in other inverted rift basins world-wide.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"192 ","pages":"Article 105356"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of backstop vertical position on the evolution of a backthrust dominated fold-and-thrust belt: Insights from viscous/brittle analogue models and comparison with cascadia","authors":"W.G. He ,&nbsp;F.O. Marques","doi":"10.1016/j.jsg.2024.105333","DOIUrl":"10.1016/j.jsg.2024.105333","url":null,"abstract":"<div><div>The most common features of a fold-and-thrust belt (FTB) are forward and backward thrusts, the distribution of which depends on several parameters that have been tested extensively. To further understand the development of FTBs in which an incompetent (viscous) detachment layer exists between an overlying deformed sedimentary pack (reverse faulting) and underlying undeformed basement, this study comprises four different viscous(bottom)/brittle(top) analogue models to test the effects of a new parameter, the vertical position of the piston's base relative to the viscous/brittle interface. Given that the models include a basal viscous layer, we also tested the effects of variable strain rate. The results indicate that both tested parameters significantly influence the internal structure of the sand wedge regarding wedge slope, structural style and thrust vergence. Finally, we compare the experimental results with the formation of the Cascadia FTB, and conclude that the model with shallow piston and constant piston velocity reproduces all the critical features of the composite structure of the Cascadia FTB, i.e. a foreland domain with dominant landward vergent thrusts and a shallow taper angle, a hinterland domain with dominant oceanward vergent thrusts and a flat topographic surface (taper angle = 0°), and a triangular zone separating the two domains with opposite vergences.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"191 ","pages":"Article 105333"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrophysical Characterization of Metamorphic Rocks using X-ray Micro-CT data – Implications for fluid flow","authors":"Ritwik Chakraborty ,&nbsp;Michael Späth ,&nbsp;Akash Kumar ,&nbsp;Benjamin Busch ,&nbsp;Britta Nestler ,&nbsp;Manish A. Mamtani ,&nbsp;Christoph Hilgers","doi":"10.1016/j.jsg.2025.105338","DOIUrl":"10.1016/j.jsg.2025.105338","url":null,"abstract":"<div><div>The petrophysical properties (porosity and permeability) of rocks are significantly influenced by their microstructure and fabric anisotropy, which can be evaluated using X-ray micro-computed tomography (μCT). Through study of mica schists from the Singhbhum Shear Zone (Eastern India), we demonstrate the potential to perform X-ray micro-CT studies in metamorphic rocks and discuss the associated challenges in data processing. We show that automated thresholding of greyscale values from μCT data acquisition yields abnormally high porosity/permeability values in schists when compared to the values obtained from laboratory measurements of the same samples. We develop a <em>modus operandi</em> where the laboratory measured porosity value from an individual schist sample is used to calibrate the greyscale threshold range (designating void space) of μCT data from the same sample. This calibration is done using PACE3D numerical simulation framework that allows a multiphase-field approach, and it is shown that (a) porosities of schist derived from analysis of μCT data (post re-thresholding) fit well with laboratory measured values of respective samples and (b) anisotropy of permeability can be computed from μCT data. Permeability computed using the μCT data (post re-thresholding) vis-à-vis laboratory measurements are comparable in 4 out of 5 schist samples analysed here, when the samples are treated as a two phase system (void spaces as one phase and solid rock mass as the second phase) in PACE3D. The aberration in one schist sample is attributed to its heterogeneous layering and microstructure that comprises alternate layers of coarse and fine grain size aggregates of phyllosilicate + quartz. Re-computation of permeability by performing three-phase simulations for the above layered sample in PACE3D framework by introducing phyllosilicate as a third phase (in addition to void spaces and other mineral phases) yields results similar to the laboratory measurements. We conclude that our approach of integrating μCT data, laboratory measurement of petrophysical properties and microstructure modelling/simulation in PACE3D multiphase-field framework helps evaluate the role of rheological variations in controlling porosity/permeability. Thus this study has a bearing on enhancing knowledge about fluid flow in metamorphic rocks with possible implications for mineralization.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"191 ","pages":"Article 105338"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co- and postseismic stress transfer on different types of faults in Southern Tibet by the 2015 Mw7.8 Gorkha earthquake","authors":"C. Yue ,&nbsp;C.Y. Qu ,&nbsp;X.F. Li ,&nbsp;L.Y. Meng ,&nbsp;X.H. Jiang ,&nbsp;D.L. Wu","doi":"10.1016/j.jsg.2024.105336","DOIUrl":"10.1016/j.jsg.2024.105336","url":null,"abstract":"<div><div>The influence of the 2015 Gorkha earthquake on the co- and postseismic Coulomb Failure Stress (CFS) of faults in Southern Tibet is a scientific issue that warrants further investigation. We employ the flat-ramp fault slip model to calculate the ΔCFS of nearly north-south-trending rifts and east-west-trending faults in Southern Tibet. This analysis considers the Mw7.8 main-shock, the Mw7.3 aftershock, afterslip, and viscoelastic relaxation, utilizing the Burgers rheological model. By integrating the postseismic deformation and b-value, we discuss the differences and similarities in ΔCFS and the underlying mechanisms.</div><div>The mainshock, aftershocks, and afterslip exhibit similar patterns of CFS effects, all acting as CFS triggers on the rifts. Viscoelastic relaxation has an unloading effect on the southern portion of the rifts, while it exerts a triggering effect on rifts located farther from the focal area, with the exception of the Dangreyongcuo rift. The influence of CFS on nearly east-west-trending faults is associated with their kinematic characteristics. Coseismic CFS triggering is concentrated in the near-source sections of the normal faults, with viscoelastic relaxation primarily resulting in unloading. The dextral strike-slip faults are governed by shear stress; the eastern sections serve as co- and postseismic CFS triggering areas, while the western sections are characterized as CFS shadow regions. Earthquakes along the Shenzha–Dingjie rift were primarily triggered by co- and postseismic CFS induced by the Gorkha earthquake. In contrast, earthquakes along the Xietongmen rift were mainly associated with elevated stress levels on the fault prior to the earthquake.</div></div>","PeriodicalId":50035,"journal":{"name":"Journal of Structural Geology","volume":"191 ","pages":"Article 105336"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}