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Physics-based simulations of earthquake scenarios on the Kopili fault in Northeast India: Insights into seismic hazard and fault mechanics 印度东北部Kopili断层地震情景的物理模拟:对地震危险性和断层力学的见解
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-07-09 DOI: 10.1016/j.tecto.2025.230838
T.C. Sunilkumar , Zhenguo Zhang , Zijia Wang , Zhongqiu He , Danhua Xin , Tianhong Xu , Wenqiang Wang
{"title":"Physics-based simulations of earthquake scenarios on the Kopili fault in Northeast India: Insights into seismic hazard and fault mechanics","authors":"T.C. Sunilkumar ,&nbsp;Zhenguo Zhang ,&nbsp;Zijia Wang ,&nbsp;Zhongqiu He ,&nbsp;Danhua Xin ,&nbsp;Tianhong Xu ,&nbsp;Wenqiang Wang","doi":"10.1016/j.tecto.2025.230838","DOIUrl":"10.1016/j.tecto.2025.230838","url":null,"abstract":"<div><div>Understanding the seismic risks associated with the Kopili fault (KF) in northeast India is essential for effective risk management. We employed advanced physics-based dynamic rupture simulation scenarios to quantify the fault’s potential for generating damaging earthquakes. Our models indicate that the central KF segment can produce significant earthquakes with moment magnitudes (Mw) potentially reaching 7.3, and possibly up to 7.5. The analysis revealed considerable variability in rupture extent and ground motion characteristics, strongly influenced by fault and model parameters. A detailed stress inversion analysis shows that the maximum horizontal stress (<span><math><msub><mrow><mi>S</mi></mrow><mrow><mtext>H</mtext></mrow></msub></math></span>) is oriented at <span><math><mo>∼</mo></math></span>N41°E within an oblique-reverse stress regime, significantly impacting rupture behavior. Rupture simulations indicate that earthquakes originating from the central segment of the fault produce the largest rupture areas and the most intense ground shaking, with peak ground velocities exceeding 0.6 m/s and corresponding intensities of MMI VIII and above. Sensitivity analyses highlight the critical roles of nucleation points, dynamic rupture parameters and <span><math><msub><mrow><mi>S</mi></mrow><mrow><mtext>H</mtext></mrow></msub></math></span> orientation in determining rupture propagation and ground motion distribution. Notably, minor adjustments in <span><math><msub><mrow><mi>S</mi></mrow><mrow><mtext>H</mtext></mrow></msub></math></span>, such as a 10° variation, can lead to substantial changes in rupture characteristics, including extreme scenarios reaching Mw 7.5 in the counterclockwise stress rotation. Additionally, supershear effects observed in several scenarios likely stem from initial stress variations along the fault. The physics-based simulation of ground motion shows that, compared to ground motion prediction equations (GMPEs) estimates, it provides more reliable predictions. These insights enhance our understanding of how these parameters influence earthquake dynamics and are vital for developing effective earthquake risk management strategies in northeast India. By integrating physics-based dynamic rupture modeling with empirical ground motion predictions, our study could provide a robust framework for seismic hazard assessment in the KF zone and similar tectonic settings.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230838"},"PeriodicalIF":2.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Seismogenic independence of earthquake doublet: Insights from the 2023 Kahramanmaraş, Türkiye earthquake sequence 地震双重波的发震独立性:来自2023年kahramanmaraku, trkiye地震序列的见解
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-07-07 DOI: 10.1016/j.tecto.2025.230850
Kexu Shi , Weijia Sun , Xu Zhao , Erdinc Saygin , Zhipeng Zhang
{"title":"Seismogenic independence of earthquake doublet: Insights from the 2023 Kahramanmaraş, Türkiye earthquake sequence","authors":"Kexu Shi ,&nbsp;Weijia Sun ,&nbsp;Xu Zhao ,&nbsp;Erdinc Saygin ,&nbsp;Zhipeng Zhang","doi":"10.1016/j.tecto.2025.230850","DOIUrl":"10.1016/j.tecto.2025.230850","url":null,"abstract":"<div><div>The interplay between large earthquake doublets often involves a triggering mechanism, yet the specifics of their interaction during the seismogenic process remain poorly understood. Here, we examine the seismogenic relationship using the 2023 Kahramanmaraş, Türkiye earthquake doublet. By analyzing repeating earthquakes (REs) prior to the two 2023 events, we estimated the pre-seismic deep slip rates along the East Anatolian Fault (EAF) and assessed fault movement. Utilizing two distinct earthquake relocation techniques, we identified REs and improved the accuracy of their locations. Our findings reveal a higher deep slip rate of approximately 20 mm/year at the Maras triple junction (MTJ) of the EAF, contrasting with previous estimates based on surface fracture observations. The dense clustering of REs at the MTJ suggests that the seismogenic zone of the first event was weakly coupled and may have undergone accelerated creep before the doublet. Conversely, the seismogenic zone of the second event showed minimal seismic activity and a lack of REs. Integrating these results with regional tectonic data, we suggest that the seismogenic environments of the doublet are markedly different, indicating that the seismogenic processes of the two events are largely independent.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230850"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cenozoic evolution of the Great Arc of the Caribbean and Lesser Antilles slabs: A perspective from a 3D numerical subduction model 加勒比海大弧形和小安的列斯板块的新生代演化:一个三维数值俯冲模型的视角
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-07-06 DOI: 10.1016/j.tecto.2025.230849
A. Bayona , V.C. Manea , S. Yoshioka
{"title":"Cenozoic evolution of the Great Arc of the Caribbean and Lesser Antilles slabs: A perspective from a 3D numerical subduction model","authors":"A. Bayona ,&nbsp;V.C. Manea ,&nbsp;S. Yoshioka","doi":"10.1016/j.tecto.2025.230849","DOIUrl":"10.1016/j.tecto.2025.230849","url":null,"abstract":"<div><div>The Caribbean Plate features a unique tectonic setting and evolution, controlled by the interaction among Cocos, Nazca, North American, and South American Plates. Presently, the Caribbean Plate experiences active subduction on both lateral sides, along the Middle American Trench to the west and the Lesser Antilles Trench to the east. Subduction along the Great Arc of the Caribbean was active from the Early Cretaceous until the Eocene. In this study, we conducted 3D numerical simulations of subduction tailored to the tectonic evolution of the Caribbean Plate using plate reconstructions as kinematic boundary conditions. This study introduces the first numerical model that spans the complete subduction history of the Lesser Antilles. Our 3D numerical simulations focus on the subduction processes involving the Great Arc of the Caribbean and the Lesser Antilles in the northeastern region of the Caribbean Plate since the onset of the Cenozoic era, incorporating pre-existing slabs from earlier subduction. For the Great Arc of the Caribbean, we observe a west-to-east propagating slab detachment that correlates with the cessation of subduction and arc volcanism. In contrast, in the Lesser Antilles, we detail the slab trajectory at the mantle transition zone-lower mantle boundary, where it stagnates due to the combination of a higher viscosity of the lower mantle and the negative Clapeyron slope of the phase transition from ringwoodite to bridgmanite + ferropericlase. Our findings highlight dynamic mechanisms driving slab flattening and lateral motion, including trench retreat and rollback. Finally, the model predicts the existence of corner flow in the mantle wedge and trench-parallel sub-slab flow, in agreement with observed seismic anisotropy patterns. Our conclusions align with prior research and enhance the understanding of how trench retreat, slab detachment and phase transitions have shaped the evolution of the Great Arc of the Caribbean and Lesser Antilles slabs.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230849"},"PeriodicalIF":2.7,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mantle upwelling induced by a bilateral convergent double subduction during Late Paleozoic in Eastern Tianshan, NW China: Evidence from high-resolution magnetotelluric profile 东天山晚古生代双俯冲诱导的地幔上涌:高分辨率大地电磁剖面证据
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-07-05 DOI: 10.1016/j.tecto.2025.230839
Ying Liu , Chao Chen , Yinhe Luo , Jinsong Du , Qing Liang , Graham Heinson
{"title":"Mantle upwelling induced by a bilateral convergent double subduction during Late Paleozoic in Eastern Tianshan, NW China: Evidence from high-resolution magnetotelluric profile","authors":"Ying Liu ,&nbsp;Chao Chen ,&nbsp;Yinhe Luo ,&nbsp;Jinsong Du ,&nbsp;Qing Liang ,&nbsp;Graham Heinson","doi":"10.1016/j.tecto.2025.230839","DOIUrl":"10.1016/j.tecto.2025.230839","url":null,"abstract":"<div><div>Late Paleozoic oceanic subduction has been proposed for the formation of Eastern Tianshan, NW China, situated in the southern Central Asian Orogenic Belt. However, the patterns and consequences of the subduction remain undetermined. To identify the mode of the Late Paleozoic subduction, a high-resolution magnetotelluric (MT) long-profile across Eastern Tianshan was deployed. A three-dimensional (3D) inversion was conducted to obtain the resistivity model beneath the profile. The most obvious feature in the resistivity model is a well-developed conductor (∼30 Ωm) beneath Turpan-Hami Basin from ∼15 km depth extending to the uppermost mantle. This conductor is preferably ascribed to the metamorphic fluids from an ancient mantle upwelling. In addition, the MT observation suggests a double subduction in the south Kangguer suture, together with a southward dipping subduction in the north Kalamaili Fault during the Late Paleozoic. The bilateral convergent double subduction induced the mantle upwelling and controlled the initial extensional environment during Late Paleozoic in the Turpan-Hami Basin.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230839"},"PeriodicalIF":2.7,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydration and petrologic changes of inner portions of the subducting oceanic lithosphere facilitated by intermediate-depth faulting 中深度断裂促进了大洋俯冲岩石圈内部水化和岩石学的变化
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-07-03 DOI: 10.1016/j.tecto.2025.230832
M. Scambelluri , G. Toffol , E. Cannaò , D. Belmonte , N. Campomenosi , S. Cacciari , G. Pennacchioni
{"title":"Hydration and petrologic changes of inner portions of the subducting oceanic lithosphere facilitated by intermediate-depth faulting","authors":"M. Scambelluri ,&nbsp;G. Toffol ,&nbsp;E. Cannaò ,&nbsp;D. Belmonte ,&nbsp;N. Campomenosi ,&nbsp;S. Cacciari ,&nbsp;G. Pennacchioni","doi":"10.1016/j.tecto.2025.230832","DOIUrl":"10.1016/j.tecto.2025.230832","url":null,"abstract":"<div><div>The subduction-zone rheology and seismic behaviour of hydrated oceanic slabs have been widely studied, while the unaltered, dry portions of the subducting lithosphere remain less understood despite their role in earthquake generation and slab pull through eclogitization. We present field-based evidence from the ophiolitic Lanzo Massif (Western Alps), a slice of oceanic lithosphere composed of mantle peridotite and small volumes of gabbro which largely escaped hydration and Alpine metamorphism, representing a mechanically rigid block in the subduction complex. At intermediate depths, this dry lithosphere locally developed pseudotachylyte-bearing faults (e.g. the Moncuni locality) and widespread meso- to micro-faults (e.g., the Mt. Arpone locality). At Mt. Arpone, faults offset the gabbroic dykes by several centimetres: they contain sub-micrometric “annealed” ultramafic ultracataclasite of olivine, pyroxene and spinel, locally overgrown by chlorite and orthopyroxene. These features indicate faulting under dry conditions, which produced a tectonic porosity and enabled localized fluid infiltration. This led to discontinuous hydration of peridotite and to the widespread transformation of cataclastic gabbroic plagioclase into high-pressure zoisite-paragonite symplectites. Thermodynamic modelling suggests that plagioclase breakdown during faulting occurred under blueschist-facies conditions. Recent petrological studies show that this reaction is associated to volume reduction and the formation of reactive porosity, making plagioclase the most intensely eclogitized mineral in the studied samples. Trace element analyses reveal that fluid infiltration drove the internal (closed-system) redistribution of fluid-mobile elements. Eclogitization of the Lanzo peridotite and gabbro only occurred where fluids were present, either from limited oceanic hydration, or from subduction-related fluid infiltration through faults and the porosity created by the metamorphic breakdown of gabbroic plagioclase. The Arpone blueschist-facies ultracataclasites may represent seismic structures that did not evolve into frictional melting; they may be the precursors to the earthquake-generating faults that developed at Moncuni.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230832"},"PeriodicalIF":2.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anisotropy of the thermal conductivity, thermal expansion coefficient, and seismic wave velocity in the oceanic lithosphere–asthenosphere system 海洋岩石圈-软流圈系统中热导率、热膨胀系数和地震波速度的各向异性
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-06-26 DOI: 10.1016/j.tecto.2025.230822
M. Morishige
{"title":"Anisotropy of the thermal conductivity, thermal expansion coefficient, and seismic wave velocity in the oceanic lithosphere–asthenosphere system","authors":"M. Morishige","doi":"10.1016/j.tecto.2025.230822","DOIUrl":"10.1016/j.tecto.2025.230822","url":null,"abstract":"<div><div>Previous numerical studies have considered complex material properties in investigations of the thermal structure of oceanic plates, although the properties are assumed to be isotropic. This study focused on anisotropic thermal conductivity and expansion coefficients related to the crystallographic-preferred orientation of mantle minerals, and the effects of this anisotropy on the thermal structure of oceanic plates and associated surface heat flow, seafloor subsidence, and seismic anisotropy. A steady-state temperature and rock flow velocity are obtained in a two-dimensional model domain near a mid-ocean ridge. The results show that anisotropic thermal conductivity increases the mantle temperature by up to 18–28 K for oceanic crust with an age of 60 Myr, depending on the assumed half-spreading rate, because the vertical component of the conductivity is lower than the isotropic value. The effects on surface heat flow are minor. Anisotropy of the thermal expansion coefficient results in a small increase in seafloor subsidence, as the vertical component of the thermal expansion coefficient is higher than the isotropic case. Incorporating the effects of enstatite leads to a reduced anisotropy for the thermal conductivity and expansion coefficient. The increase in mantle viscosity due to dehydration associated with partial melting has a large effect on the seismic anisotropy. This leads to an abrupt, largely age-independent increase in azimuthal and radial anisotropy at <span><math><mo>∼</mo></math></span>60 km depth, which may explain some seismic observations.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230822"},"PeriodicalIF":2.7,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Gravitational instability of thickened yet compositionally buoyant Tibetan mantle lithosphere 增厚但成分浮力的西藏地幔岩石圈的重力不稳定性
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-06-24 DOI: 10.1016/j.tecto.2025.230837
Gregory A. Houseman , Philip C. England , Lynn A. Evans
{"title":"Gravitational instability of thickened yet compositionally buoyant Tibetan mantle lithosphere","authors":"Gregory A. Houseman ,&nbsp;Philip C. England ,&nbsp;Lynn A. Evans","doi":"10.1016/j.tecto.2025.230837","DOIUrl":"10.1016/j.tecto.2025.230837","url":null,"abstract":"<div><div>The Tibetan plateau, one of the major topographic features of the Earth, presents many unanswered questions regarding its evolution, present structure, and continuing geological activity. The extensive crustal thickening that is attributed to continental convergence between India and Eurasia sustained for the past 55 Myr, and continuing today, is underlain by an upper mantle in which relatively fast shear-wave speeds are measured to depths of 200 km and more. Although the high elevation of the plateau can be attributed mainly to the thickness of the crust, the observation that the plateau is now extending is evidence that the lithosphere has increased its gravitational potential energy since it was thickened. Extensive volcanism during the current continental collision additionally implies that the lithosphere and/or uppermost mantle of Tibet was re-heated. Replacement of mantle lithosphere by asthenosphere in a convective thinning process has been advanced as an explanation of that re-heating, but that process has been difficult to reconcile with the high shear-wave velocities measured in the upper mantle beneath the plateau. However, a model based on a restricted overturn of a depleted, metasomatised, mantle lithosphere in the upper 200 km of the mantle can reconcile these apparently contradictory observations. Such overturn can explain how the observed distribution of seismic velocities has been produced, how heat is injected into the lithosphere producing transient uplift, and how mantle-derived melts can rapidly reach the base of the crust in widely distributed locations across the plateau.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230837"},"PeriodicalIF":2.7,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Lithospheric temperature response to asthenosphere updoming and the upper mantle-crustal magmatic underplating in the Western Ohře (Eger) Rift area, Czechia 捷克Ohře (Eger)裂谷西部软流圈隆升和上地幔-地壳岩浆底沉降对岩石圈温度的响应
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-06-22 DOI: 10.1016/j.tecto.2025.230836
Jan Šafanda , Vladislav Rapprich , Tomáš Fischer , Václav Špillar , Pavla Hrubcová , Petr Dědeček
{"title":"Lithospheric temperature response to asthenosphere updoming and the upper mantle-crustal magmatic underplating in the Western Ohře (Eger) Rift area, Czechia","authors":"Jan Šafanda ,&nbsp;Vladislav Rapprich ,&nbsp;Tomáš Fischer ,&nbsp;Václav Špillar ,&nbsp;Pavla Hrubcová ,&nbsp;Petr Dědeček","doi":"10.1016/j.tecto.2025.230836","DOIUrl":"10.1016/j.tecto.2025.230836","url":null,"abstract":"<div><div>The Western Ohře (Eger) Rift is characterized by frequent earthquake swarms, elevated CO₂ emissions, and Pleistocene volcanism. Understanding the lithospheric temperature is an essential for integrating these phenomena within a broader geodynamic context. In order to contribute to these research goals, we modelled thermal evolution of the region using an axisymmetric geothermal model and numerically solved the transient heat conduction equation. The simulation begins at 35 Ma, when the asthenosphere uplifted from 100 km to 75 km depth within a 90-km diameter-wide region. This updoming was followed by two episodes of basaltic underplating at depths of 30–33 km during 15–10 Ma and 5–1 Ma. We modelled the underplating as a sequence of ∼100 m thick intrusions, 30 km in diameter, emplaced at 1 Myr intervals. Each intrusion released latent heat of crystallization between the liquidus (1,387 °C) and solidus (720 °C) temperatures. The modelled lithospheric temperatures indicate that the 300 °C isotherm, often marking the brittle-ductile transition, is located at ∼11 km depth, consistent with the lower extent of the local swarm seismicity range (6.5–11 km). The base of the magmatic underplating remains just above the solidus, suggesting the presence of partially molten material. The residual melt may contribute to the ongoing CO<sub>2</sub> emissions observed in the area.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230836"},"PeriodicalIF":2.7,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Frictional properties of serpentine gouge under high pore-fluid pressure and low effective normal stress conditions 高孔隙流体压力和低有效法向应力条件下蛇纹石泥的摩擦特性
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-06-21 DOI: 10.1016/j.tecto.2025.230835
Shimin Liu , Lei Zhang , Changrong He , Xi Ma
{"title":"Frictional properties of serpentine gouge under high pore-fluid pressure and low effective normal stress conditions","authors":"Shimin Liu ,&nbsp;Lei Zhang ,&nbsp;Changrong He ,&nbsp;Xi Ma","doi":"10.1016/j.tecto.2025.230835","DOIUrl":"10.1016/j.tecto.2025.230835","url":null,"abstract":"<div><div>Serpentine minerals exist pervasively near the subduction mantle wedge. Due to their distinct physical and chemical properties, they have the potential to significantly impact the frictional behavior and stability of subduction fault zones. Here we investigated the frictional properties of an antigorite-lizardite mixture gouge under hydrothermal conditions with an effective normal stress of 30 MPa, a pore fluid pressure of 100 MPa, and temperatures ranging from 100 °C to 500 °C. To explore the velocity dependence of frictional strength, the loading rate is switched between 0.04, 0.2, and 1.0 μm/s. The results show that the friction coefficient of the gouge decreases systematically with temperature, with values ranging from 0.75 to 0.36. The thermal weakening of the gouge friction can be attributed to enhanced intergranular pressure solution processes activated at the relatively high fluid pressure. Stable velocity-strengthening behavior was observed in most cases. However, velocity-weakening behavior, evidenced by sustained oscillation, was found at 300 °C and 400 °C at the slowest loading rate (0.04 μm/s), with a transition to velocity-strengthening behavior at higher loading rates. Our results further suggest that, under the high pore fluid pressure and temperature conditions characteristic of the subduction zone mantle wedge, the nucleation of unstable slip at low slip rates can decelerate as fault slip accelerates into the velocity-strengthening regime, ultimately terminating as a slow-slip event. These insights contribute to a better understanding of the processes underlying slow slip events in subduction zones.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230835"},"PeriodicalIF":2.7,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New GPS-derived velocity field for Marmara region: Implications for the kinematics along the North Anatolian Fault Zone 马尔马拉地区新的gps速度场:对北安那托利亚断裂带运动学的影响
IF 2.7 3区 地球科学
Tectonophysics Pub Date : 2025-06-21 DOI: 10.1016/j.tecto.2025.230828
Ali Özkan , Hasan Hakan Yavaşoğlu , İbrahim Tiryakioğlu , Göksu Uslular , Mustafa Fahri Karabulut , Patrice Ulrich , Frédéric Masson
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