Tectonophysics最新文献

{"title":"Break-off and stagnation of the subducting Nazca slab in the mantle transition zone beneath West-Central South America","authors":"Kailun Ba ,&nbsp;Jianping Huang ,&nbsp;Youqiang Yu ,&nbsp;Jianguo Song ,&nbsp;Sanzhong Li ,&nbsp;Cong Shen ,&nbsp;Lin Liu","doi":"10.1016/j.tecto.2025.230834","DOIUrl":"10.1016/j.tecto.2025.230834","url":null,"abstract":"<div><div>The eastward subduction of the Nazca Plate beneath the South American continent forms the Andean subduction zone, while deep mantle dynamics associated with slab-entrained mantle flow, thermal structure, and geometry of the subducted slab remain debated. In this study, we have utilized a total of 49,237 receiver functions recorded by 669 stations in West-Central South America to map the variations in topography of the mantle transition zone (MTZ) discontinuities and elucidate their causes. Simultaneous depressions in apparent depths of MTZ discontinuities beneath the northern Andean Orogen are attributed to subduction-driven entrained mantle flow that generates low seismic velocity anomalies within the upper mantle. In contrast, joint analysis of detected MTZ thinning and high-velocity anomalies under the Andean Orogen (south of 26^o S) reveals a slab break-off segment within the MTZ. The uplift of the 410 km discontinuity confirms penetration of the subducting Nazca slab into the MTZ. Notably, significant MTZ thickening (primarily engendered by the depression of the 660 km discontinuity) is deciphered under the Central South American continent and indicates stagnation of subducted slab segments at the bottom of the MTZ.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230834"},"PeriodicalIF":2.7,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335616","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}

{"title":"Grenvillian-age deep crustal thrusting, terrane juxtaposition and subduction polarity reversal from the Eastern Ghats Belt, India and its tectonic implications","authors":"Shuvankar Karmakar ,&nbsp;Gautam Ghosh ,&nbsp;Sankar Bose ,&nbsp;Sneha Mukherjee ,&nbsp;Dyuti Prakash Sarkar ,&nbsp;Nilanjana Sorcar ,&nbsp;Kaushik Das","doi":"10.1016/j.tecto.2025.230833","DOIUrl":"10.1016/j.tecto.2025.230833","url":null,"abstract":"<div><div>The Proterozoic Eastern Ghats Belt (EGB) represents an arcuate orogenic belt along the east coast of India. Its western boundary is marked by a thrust-cum subduction zone system along which granulite facies rocks of the EGB were thrust over the cratonic rocks while its northern margin with the craton is marked by several crustal-scale shear zones of unresolved kinematic status. The present study generates new structural, kinematic and age data from the Mahanadi Shear Zone (MSZ) of the EGB northern margin that unveils a hitherto undisclosed chronicle of deep crustal thrusting and terrane amalgamation. Correlation of our earlier reported (M₁) high-pressure metamorphism (ca. 980–960 Ma) and clockwise pressure-temperature path in the MSZ with the presently reported deep crustal thrusting (600–800 °C) at ca. 950–900 Ma led us to infer that the MSZ represents a Grenvillian-age oblique collisional zone signifying northerly underthrusting of the Phulbani domain below the Angul-Tikarpada domains at ca. 980–900 Ma. The proposed SW directed thrusting along MSZ is at variance with the earlier reported coeval NW directed thrusting along the EGB western margin. This new report thus warrants subduction polarity reversal along the two margins of the arcuate EGB orogenic front at the same time frame. The difference in displacement velocity vectors along the two margins was resolved via combined movements on the orogen sub-parallel dextral-slip Koraput Shear Zone and the orogen transverse sinistral-slip Nagavalli-Vamshadhara Shear Zone system. The proposed tectonic model visualises the arcuate shape of the EGB orogenic front as a primary structure inherited from the original craton margin configuration.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230833"},"PeriodicalIF":2.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335617","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}

{"title":"Subsurface characterization of crystalline rocks at the Einstein Telescope candidate site (Italy): Insights from seismic tomography, geoelectrical and morphostructural analyses","authors":"F. Villani ,&nbsp;S. Maraio ,&nbsp;L. Improta ,&nbsp;P.M. De Martini ,&nbsp;D. Cavallaro ,&nbsp;M. Firetto Carlino ,&nbsp;C.A. Brunori ,&nbsp;V. Longo ,&nbsp;L. Casini ,&nbsp;M.C. Caradonna ,&nbsp;C. Zei ,&nbsp;S. Rapisarda ,&nbsp;G. Oggiano ,&nbsp;C. Giunchi ,&nbsp;G. Saccorotti ,&nbsp;M. Coltelli ,&nbsp;D. D'Urso ,&nbsp;L. Naticchioni ,&nbsp;F. Ricci ,&nbsp;G. Schillaci ,&nbsp;G.L. Cardello","doi":"10.1016/j.tecto.2025.230830","DOIUrl":"10.1016/j.tecto.2025.230830","url":null,"abstract":"<div><div>The Einstein Telescope (ET) will be the first European underground observatory of gravitational waves. The observatory's interferometric detectors will be housed in a large underground infrastructure,which necessitates a stable and quiet geological context. We present the results of a geognostic campaign conducted for the Italian candidate site in Sardinia, during which two ∼270 m-deep boreholes were drilled in granites and orthogneiss at two sites that are possible locations of the ET infrastructure. We acquired high-resolution, dense seismic and electrical resistivity tomography (ERT) profiles to complement borehole data, constraining the thickness of the weathered layer and characterizing the rock properties in terms of intact versus fractured zones down to depths of 100–240 m. At depths &gt;50 m, we observed high P-wave velocity (Vp ∼ 5000–5500 m/s, while very high Vp (∼6000 m/s) paired with very high resistivity (ρ &gt; 1000 Ωm) was found at depths of 150–200 m, suggesting unfractured or weakly fractured rocks consistent with borehole logs and literature data on geophysical surveys on crystalline rocks. We recognized a couple of sub-vertical low-Vp (∼4250–4500 m/s) and low-resistivity anomalies (ρ &lt; 500 Ωm), up to ∼15–35 m-wide, suggesting the occurrence of fracture zones with groundwater, matching the intersection with fault zones mapped at the surface. Comparison with co-located resistivity sections, downhole seismic surveys, well logs, and field-based structural and morphostructural analyses allowed us to attribute these anomalies to fault zones ∼0.3–0.5 km-long that belong to an immature fault network with shallow water circulation. This methodological approach highlights the utility of tomographic techniques combined with structural investigations and represents a guideline that can be applied in similar contexts characterized by poorly fractured crystalline rocks.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230830"},"PeriodicalIF":2.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335618","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}

{"title":"Wedge inelasticity and fully coupled models of dynamic rupture, ocean acoustic waves, and tsunami in the Japan trench: The 2011 Tohoku-Oki earthquake","authors":"Shuo Ma ,&nbsp;Yue Du","doi":"10.1016/j.tecto.2025.230831","DOIUrl":"10.1016/j.tecto.2025.230831","url":null,"abstract":"<div><div>Along-strike variations of sediment thickness and inelastic wedge deformation can significantly affect the variations of near-trench slip, seismic radiation, and tsunamigenesis along the Japan Trench. We present fully coupled models of dynamic rupture, ocean acoustic waves, and tsunami for the 2011 M_W 9.1 Tohoku-Oki earthquake to fully investigate the physics of tsunami generation and radiation fields, by extending a dynamic rupture model with wedge inelasticity (<span><span>Ma, 2023</span></span>). The fully coupled models, incorporating ocean compressibility, produce tsunami in good agreement with that from a dispersive shallow-water model, confirming the validity of both models. We show strong radiation of ocean acoustic and seismic waves caused by fast rupture velocity (∼3 km/s) and large near-trench slip south of 39°N, dominated by elastic wedge response. However, north of 39°N where sediment thickens in the northern Japan Trench, the inelastic wedge deformation excites tsunami efficiently with diminishing near-trench slip (&lt;20 m), consistent with differential bathymetry observations, but causes slow rupture velocity (∼850 m/s) and significantly weaker radiation of ocean acoustic and seismic waves. Inelastic wedge deformation thus provides a self-consistent interpretation to both depletion in high-frequency radiation and large tsunami generation in the northern Japan Trench in this earthquake, which may challenge the use of ocean acoustic waves for robust tsunami early warning.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"910 ","pages":"Article 230831"},"PeriodicalIF":2.7,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338340","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}

{"title":"Compositional controls on the thermal conductivity of igneous rocks and a model for the conductivity of Antarctic crust","authors":"Simon Willcocks ,&nbsp;Derrick Hasterok ,&nbsp;Jacqueline A. Halpin ,&nbsp;Jessica Walsh ,&nbsp;Samuel Jennings","doi":"10.1016/j.tecto.2025.230802","DOIUrl":"10.1016/j.tecto.2025.230802","url":null,"abstract":"<div><div>Modelling heat flux through the lithosphere requires accurate estimates of thermal conductivity, yet few regions have sufficient estimates to constrain thermal models. Global geochemical databases in contrast, have numerous samples, but lack physical property estimates. In this study, we combine thermal conductivity measurements on 1053 globally-distributed samples with known chemical composition—including 48 new analyses from Antarctica—to develop empirical relationships between conductivity and major element composition, modal mineralogy and normative mineralogy. Despite a skew in the residuals, all compositional models result in similar misfit (∼0.4 W m⁻¹ K⁻¹) with 95 % of samples within ±20 % of measured conductivities. We then apply this conductivity-composition relationship to the PetroChron Antarctica database to predict the thermal conductivity of 6995 igneous protoliths. We predict 95 % of thermal conductivity estimates for Antarctic geochemical samples range from 1.78 to 3.19 W m⁻¹ K⁻¹, with an average of 2.49 ± 0.31 W m⁻¹ K⁻¹. These empirical relationships provide a way to produce reasonable estimates of rock conductivity that can be used to improve heat flux estimates beneath glaciers and ice sheets where the composition of the rocks is known.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"911 ","pages":"Article 230802"},"PeriodicalIF":2.7,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580758","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}

{"title":"Lithospheric control on the deep mantle carbon transfer in the Magadi-Natron basins, East Africa","authors":"Xinxin Wang ,&nbsp;Jianfeng Yang ,&nbsp;Liang Zhao ,&nbsp;Gang Lu ,&nbsp;Ziqi Ma","doi":"10.1016/j.tecto.2025.230829","DOIUrl":"10.1016/j.tecto.2025.230829","url":null,"abstract":"<div><div>Mantle-derived carbon dioxide (CO₂) emissions during continental rifting are linked to climate change. The Archean cratonic mantle lithosphere has been considered a carbon reservoir that truncates ascending carbon-rich melts at its base, releasing huge amount of mantle CO₂ in the surrounding rift basins. These emissions are believed to be remobilized from the carbon-rich cratonic lithosphere. However, the mechanisms by which mantle carbon is reactivated from the craton to the surrounding rift basins remain poorly understood. Hence, we conducted petrological-thermomechanical modeling to investigate the migration and decarbonation processes of the carbonate-metasomatized mantle lithosphere (CMML) across the craton-mobile belt boundary during continental rifting. The model results show that for a thicker, lighter, and higher water (H₂O) content CMML, and a faster model extension, the CMML layer can be removed by the lateral advection and ascent from the craton margin to the rift basin formed in the adjacent mobile belt. Considering the 184 km long Magadi-Natron basins in East Africa, we observed that these processes generate a metamorphic CO₂ degassing flux of 0.19–0.56 Mt./yr across the rift basins. Based on the model results, we suggest that the carbon transit from the Archean Tanzanian craton into the Proterozoic Mozambique Belt boundary may be explained by the CMML migration processes. Our modeled CO₂ degassing flux provides lower bounds for the diffuse mantle CO₂ flux along faults in the Magadi-Natron basins.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"910 ","pages":"Article 230829"},"PeriodicalIF":2.7,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144320790","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}

{"title":"Recurrence of large earthquakes along the southern Xainza-Dinggye rift and comparison with the 7 January 2025, Mw7.1 Tingri earthquake, southern Tibet","authors":"Kungang Wu ,&nbsp;Marie-Luce Chevalier ,&nbsp;Jiawei Pan ,&nbsp;Fucai Liu ,&nbsp;Shaohua Yang ,&nbsp;Siqi Zhang ,&nbsp;Qiang Su ,&nbsp;Haibing Li","doi":"10.1016/j.tecto.2025.230827","DOIUrl":"10.1016/j.tecto.2025.230827","url":null,"abstract":"<div><div>Southern Tibet is dissected by seven NS-trending rifts bounded by normal faults absorbing ∼9 mm/yr of EW extension over ∼1000 km. While large earthquakes are rare in this remote region, the occurrence of the 7 January 2025, M_w7.1 Tingri earthquake on a fault with a known long-term throw rate, presents a great opportunity to compare co-seismic deformation with long-term fault behavior. Here, we first report our main post-earthquake field observations along the seismogenic Dingmuco fault (0.9 m of co-seismic vertical offset) and Lagoi fault within the southern Xainza-Dinggye rift. We then compare these observations with late Quaternary throw and extension rates along the Dingmuco fault, derived from ¹⁰Be surface-exposure dating and topographic measurements of cumulative offsets. Our results yield throw rate and extension rates of 1.1(+0.5/−0.2) and 1.1 ± 0.3 mm/yr, respectively, over the past 19 ± 5 ka. This suggests that this relatively short fault plays a substantial role, accommodating roughly 12 % of the total EW extension across southern Tibet. These findings imply an average recurrence interval of ∼800 years for earthquakes of similar magnitude along the Dingmuco fault.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"910 ","pages":"Article 230827"},"PeriodicalIF":2.7,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307955","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}

{"title":"Interplay between lateral extension and subsidence in large pull-apart basins resolved by 3D numerical modeling of the Dead Sea Basin","authors":"Nadav Wetzler ,&nbsp;Amir Sagy ,&nbsp;Shaked Engelberg ,&nbsp;Shmuel Marco ,&nbsp;Vladimir Lyakhovsky","doi":"10.1016/j.tecto.2025.230823","DOIUrl":"10.1016/j.tecto.2025.230823","url":null,"abstract":"<div><div>The evolution of large and deep interplate pull-apart basins is commonly associated with crustal extension, which promotes subsidence, sediment accumulation, Moho uplift, and elevated heat flux. However, the Dead Sea Basin departs from this tectonic model with a relatively cold and thick crust and earthquake activity down to the Moho at ∼30 km depth. The Dead Sea basin is subdivided into two sub-basins, with its deepest part at the south. Supported by previous geological, geophysical, and seismological observations, we suggest that the modern tectonic geometry of the basin evolved in two general phases. The evolutionary phases are manifested in differences in the seismicity patterns, where in the north, the longitudinal faults merge at a depth (below 17 km). In contrast, in the south, the faults remain separated. To examine the contribution of the lateral extension to the basin subsidence, we apply 3-D numerical modeling, resulting in an insufficient subsidence rate (0.3 mm/year) to explain the thickness of the sediments (∼8 km). We test whether the lateral extension plus a hypothetical magmatic intrusion explains the observed anomalies in the basin structure. Our calculation suggests that the basin evolved by a combination of two phases in which the subsidence rates accelerated from 0.3 mm/year to 0.7 mm/year at ∼5 Ma. The northern part of the basin is formed by extensional tectonics, whereas a deep magmatic intrusion could have facilitated the subsidence in the southern part of the basin. We find that the relatively low lateral slip rates in the basin enabled the cooling of the intruded crust and increased its density, which in turn intensified the subsidence rate. This scenario highlights the interplay between lateral extension and subsidence in shaping the structural and seismic characteristics of large pull-apart basins and provides a plausible explanation for the unusual depth of the Dead Sea Basin.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"910 ","pages":"Article 230823"},"PeriodicalIF":2.7,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144321434","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}

{"title":"How deformation shapes the Salar de Antofalla, southern Puna: Insights from a 4D kinematic-dynamic model","authors":"Laura Giambiagi ,&nbsp;Julieta Suriano ,&nbsp;Diego Jaldin ,&nbsp;Lucas Lothari ,&nbsp;Andrés Echaurren ,&nbsp;Rodrigo Quiroga ,&nbsp;Matías Barrionuevo ,&nbsp;José Mescua ,&nbsp;Macarena Bertoa del Llano ,&nbsp;Ahmad Arnous","doi":"10.1016/j.tecto.2025.230826","DOIUrl":"10.1016/j.tecto.2025.230826","url":null,"abstract":"<div><div>The southern Puna, characterized by salt flats, known as salars, offers key insights into how deformation during changing tectonic stress regimes influences sedimentation and basin floor subsidence in subduction-related orogens. This study focuses on the Salar de Antofalla, one of the most elongated salt flat basins in the Puna. Through structural mapping and paleostress reconstruction, we investigate the regional stress field evolution during orogeny and salar basin formation, and propose a 4D kinematic-dynamic model for the formation of the Salar de Antofalla and Salar del Fraile. Results reveal that between ∼20 and ∼ 14 Ma, the region was under a reverse faulting stress regime, followed by a transition to a strike-slip/reverse faulting regime, and eventually to a pure strike-slip faulting regime after 9 Ma. The transition from 14 to 9 Ma was marked by the activation of dextral NW-striking fault systems like the Archibarca fault, which exhibited high dilation and were linked to contemporaneous volcanic activity. From 9 to 4 Ma, the pure strike-slip faulting stress regime, characterized by E-W σ₁ and N-S σ₃, promoted the development of NE-striking dextral faults and the reactivation of sinistral NW-striking faults. This led to the formation of small salt flat basins, such as Salar del Fraile and Lower Juncalito, up to 4 Ma. After 4 Ma, a shift in σ₁ orientation toward SW-NE facilitated the formation of the NNE-striking Salar de Antofalla fault system. The connection of dextral faults of this system played a key role in the salar's formation, with dextral movement and local transtension driving subsidence. This study suggests that the Salar de Antofalla's formation resulted from dextral fault interactions and transtensional activity rather than solely compressional or extensional forces.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"910 ","pages":"Article 230826"},"PeriodicalIF":2.7,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288860","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}

{"title":"Stress field near the fault edges of a medium-sized earthquake -Possibility of stress relaxation occurring before the earthquake","authors":"Yoshihisa Iio ,&nbsp;Shinya Katoh ,&nbsp;Kazuhide Tomisaka ,&nbsp;Masayo Sawada ,&nbsp;Shunta Noda ,&nbsp;Issei Doi","doi":"10.1016/j.tecto.2025.230825","DOIUrl":"10.1016/j.tecto.2025.230825","url":null,"abstract":"<div><div>By analyzing aftershock focal mechanisms of a magnitude 5.6 earthquake, we estimated the stress field around the fault in detail, and found that the direction of the σ1 axis had deviated from horizontal near the fault ends in the hanging wall of the fault. This rotation was not seen before the earthquake, and is consistent with the stress changes caused by the earthquake. It is inferred from these results that the differential stress was very small before the earthquake near the fault ends. On the other hand, there was no rotation of the σ1 axis near the fault except for the ends of the fault, and then it is estimated that the differential stress before the earthquake at the center of the fault was quite large, much larger than the stress changes at the end of the fault. These results suggest that stress relaxation may have occurred near the fault ends before the earthquake. This is consistent with the results of the 2017 Central Tottori earthquake (M6.8), in which the stress state near the fault ends was estimated for the first time from a large amount of high-precision aftershock data. The present study is considered important because a wealth of data is available even before the earthquake, and the stress field before the earthquake can be regarded as homogeneous even near the fault, showing no rotation of the σ1 axis. In the future, it will be important to investigate whether this result holds for other earthquakes of different sizes.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"910 ","pages":"Article 230825"},"PeriodicalIF":2.7,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144261647","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}