Tectonophysics最新文献

{"title":"High-rate GNSS detects the near- and far-field effects of displacements during the 2011 Tohoku Mw9.0 earthquake","authors":"Peiliang Xu","doi":"10.1016/j.tecto.2025.230742","DOIUrl":"10.1016/j.tecto.2025.230742","url":null,"abstract":"<div><div>Although there are a great number of research and publications on empirical amplitude, distance and magnitude scaling laws, none of them have ever considered the near- and far-field effects of displacement functions of seismic waves. We use the GEONET GNSS data collected from the 2011 Tohoku Mw9.0 earthquake to resolve the inconsistency between empirical amplitude, distance and magnitude scaling laws and theoretical displacement functions. We find that the high-rate dynamical GNSS PPP displacements clearly detect the near- and far-field amplitude distance scaling effects during the 2011 Tohoku Mw9.0 earthquake. The GNSS PPP coseismic displacements decay much more rapidly than theoretically expected in the near field but likely more slowly in the far field. If the near-field effect of displacements is not correctly taken into account, the decay rate will be significantly underestimated, implying that magnitudes of earthquakes will be significantly underestimated from near-field data with profound negative impact in earthquake early warning and hazard assessment.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"907 ","pages":"Article 230742"},"PeriodicalIF":2.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870354","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":"Revealing strong earthquake risks in seismic gaps of the Sichuan-Yunnan region based on crustal-scale magnetic inversion","authors":"Weinan Wang ,&nbsp;Liguo Jiao ,&nbsp;Jiyao Tu ,&nbsp;Yu Lei ,&nbsp;Junhao Zhao ,&nbsp;Zhaobo He ,&nbsp;Kunjie Sun ,&nbsp;Huaran Chen","doi":"10.1016/j.tecto.2025.230741","DOIUrl":"10.1016/j.tecto.2025.230741","url":null,"abstract":"<div><div>The physical property structure of the crustal medium exerts a significant control on the formation of seismic gaps and the associated strong earthquake risk. Using EMAG2-v3 magnetic anomaly grids and 5561 field outcrop rock magnetic susceptibility data, we inverted the 0.1 × 0.1⁰ 3D magnetic structure of the Sichuan-Yunnan region. Based on this structure, we analyzed its influence on regional tectonic deformation and assessed the seismic risks in major seismic gaps. The strong magnetic bodies primarily originate from the NE-trending Neoproterozoic basement of the Sichuan Basin and the finger-like mafic-ultramafic channels in the central Yunnan block formed by the Permian Emeishan plumelets. These mafic components intensify the crust and exert varying degrees of resistance to the extrusion and escape of the Tibetan Plateau, indicating that the early strong magnetic basement plays a more significant role in craton strengthening and stabilization compared to the later mantle plume. Based on magnetic boundaries and magnetic intensity, combined with stress accumulation and fault coupling, the following seismic risks are identified: The southernmost segment of the Longmenshan Fault Zone and the Mianning-Xichang section, especially its southern half near Xichang, are at high risk of strong earthquakes (<em>M</em>_S 7+) and moderate-strong earthquakes (<em>M</em>_S 6-<em>M</em>_S 7), respectively. The Bamei-Kangding section has a moderate earthquake (&lt;<em>M</em>_S 6) risk. The Dayi seismic gap shows no short-term strong earthquake risk but may shift to the Pujiang-Xinjin Fault Zone ∼60 km southeast.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"906 ","pages":"Article 230741"},"PeriodicalIF":2.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807622","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":"Strength of the lithosphere in Graham Land region (Antarctic Peninsula), derived from geological and geophysical data","authors":"Fernando Linsalata ,&nbsp;Daniele Melini ,&nbsp;Giorgio Spada","doi":"10.1016/j.tecto.2025.230727","DOIUrl":"10.1016/j.tecto.2025.230727","url":null,"abstract":"<div><div>We explore the lithospheric strength in the Graham Land region of the Antarctic Peninsula (AP) through the integration of geological and geophysical data with numerical modeling. We used GNSS data and Glacial Isostatic Adjustment (GIA) models to derive velocity and strain fields, while rheological parameters and geothermal heat flow (GHF) provided constraints for calculating the lithospheric strength profile. The methodology incorporates the Yield Strength Envelope (YSE), a framework that characterizes lithospheric strength at varying depths by accounting for both brittle and viscous deformation. A key result is a refined model of vertical and horizontal velocity fields, revealing a dominant uplift with peak rates reaching approximately 12.7 mm yr<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. The strength model reveals a lithosphere with significant thermal variations, which are influenced by substrate composition and regional geodynamic processes. The analysis underscores that the lithosphere's mechanical behavior is strongly impacted by regional tectonic interactions and elevated geothermal heat flow. This work enhances understanding of Antarctic lithospheric dynamics, with implications for geological evolution and global climate change studies.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"906 ","pages":"Article 230727"},"PeriodicalIF":2.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807624","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":"Moho depth and sediment thickness estimates for the coastal basins of southeastern Tanzania and the Mozambique Coastal Plain","authors":"Alexandra Sabattier ,&nbsp;Andrew Nyblade","doi":"10.1016/j.tecto.2025.230738","DOIUrl":"10.1016/j.tecto.2025.230738","url":null,"abstract":"<div><div>We investigate crustal structure in the southeastern coastal basins of Tanzania and the Mozambique Coastal Plain (MCP), which formed during the breakup of Gondwana, using P-wave receiver functions and Rayleigh wave dispersion measurements. Sediment thicknesses, Moho depths, and the amount of crustal thinning that occurred during basin formation along the passive margin of eastern Africa are poorly known. Also, for the MCP, the nature of the crust, whether it is stretched continental crust, oceanic crust or transitional crust remains uncertain. Results from 13 seismic stations in the MCP reveal sediment thicknesses ranging from four to nine km and Moho depths ranging from 24 to 37 km, with an average of 28 km. The average crustal shear wave velocities for stations in the MCP range from 3.6 to 3.7 km/s, indicating the crust is of continental origin and not oceanic. In addition, we find little evidence for high velocity mafic layers in the MCP crust, as would be expected for oceanic crust. Assuming a crustal thickness of 37 km for the MCP prior to thinning yields a crustal stretching (β) factor of ∼1.7. Results from six seismic stations in the coastal basins of southeastern Tanzania reveal sediment thicknesses ranging from four to six km and Moho depths ranging from 25 to 34 km, with an average of 30 km. Assuming a crustal thickness of 38 km for southeastern Tanzania prior to thinning yields a crustal stretching (β) factor of ∼1.5. This finding, when combined with the β factor for the MCP, suggests similar amounts of crustal stretching along much of the eastern African passive margin.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"906 ","pages":"Article 230738"},"PeriodicalIF":2.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807625","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":"The Tokyo Bay earthquake nest, Japan: Implications for a subducted seamount","authors":"Junichi Nakajima","doi":"10.1016/j.tecto.2025.230728","DOIUrl":"10.1016/j.tecto.2025.230728","url":null,"abstract":"<div><div>Many earthquake nests (regions of highly concentrated seismicity isolated from nearby activity) exist beneath the Tokyo metropolitan area in Japan. The largest and most active nest is the Tokyo Bay earthquake nest located at depths of 60–70 km in the northern part of Tokyo Bay. The largest earthquake in the Tokyo Bay earthquake nest was an M6 earthquake over the last ~20 years. However, it is considered that the 1894 Meiji Tokyo earthquake (M7.0) occurred around the nest. Of note, no studies have explored the Tokyo Bay earthquake nest, and the spatial distribution of earthquakes remains poorly understood. Thus, this study is aimed at investigating the spatial characteristics of the seismogenic behavior of the Tokyo Bay earthquake nest through precise hypocenter relocation. The findings reveal that the earthquake nest forms a circular distribution of earthquakes (radius of ~10 km), and plate-interface earthquakes occur on a well-defined westward-dipping plane with a slightly steeper dip angle than the average dip angle of the subducting Pacific (PAC) plate. Moreover, the seismogenic behavior differs spatially, with many and few plate-interface earthquakes occurring in the second quadrant and third quadrant of the nest, respectively, and M ≥ 5 earthquakes occurring in the fourth quadrant. As the characteristic scale (radius and height) of the Tokyo Bay earthquake nest is comparable with that of the seamounts on the incoming PAC plate, I infer that the Tokyo Bay earthquake nest is caused by a subducted seamount. The size of the Tokyo Bay earthquake nest is sufficiently large to generate M ~ 7 earthquakes and can be a candidate for the hypocenter of the Meiji Tokyo earthquake.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"906 ","pages":"Article 230728"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807623","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":"Crustal structure of the Curnamona Province in Australia by ambient noise tomography","authors":"Xin Tan ,&nbsp;Yingjie Yang ,&nbsp;Graham Heinson ,&nbsp;Ben Kay ,&nbsp;Goran Boren ,&nbsp;Xiaozhou Yang","doi":"10.1016/j.tecto.2025.230737","DOIUrl":"10.1016/j.tecto.2025.230737","url":null,"abstract":"<div><div>The Curnamona Province in southern Australia is a 90,000 km² Paleoproterozoic to Mesoproterozoic craton that rifted from the Gawler Craton in the Neoproterozoic and is now separated by the Adelaide Rift Complex sediments in the Flinders Ranges. Three-component passive seismic data were collected over 30 days at 135 stations spaced approximately 25 km with sample rate of 2 ms and a natural frequency of 5 Hz. Cross-correlation functions of ambient noise were calculated between station pairs to determine dispersion curves at a period bandwidth of 3 to 9 s, from which a shear-wave velocity model was constructed to a depth of 20 km. In the top 5 km, low shear-wave velocity &lt; 3400 m/s correlates with low electrical resistivity &lt;100 Ohm.m from a broadband MT inversion of 134 co-located sites, primarily due to fluid-porosity of sediments. In the depth range 5–20 km there are two notable features. Firstly, across the southern part of the Curnamona Province shear-wave velocity increases by &gt;200 m/s from west to east, over ∼200 km, correlated with a trend in Bouguer gravity that increases from −200 μm/s² to +200 μm/s². Secondly, there is weaker correlation in dip and spatial extent between a zone of low resistivity &lt;10 Ohm.m and low shear-wave velocity &lt; 3600 m/s. Higher density crust in the eastern margin of the Curnamona Province may be due to Paleoproterozoic-aged mafic crust that was originally subducted and then upthrust to shallower depths during the Olarian Orogeny from 1620 to 1580 Ma. Reduced shear-wave velocity coincident with low-resistivity in the crust may be related to grain-boundary graphitic Paleoproterozoic sediments that would be ductile with slightly lower shear-modulus and be electrically conductive.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"906 ","pages":"Article 230737"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829217","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 electrical structure of Zhenghe-Dapu fault in South China determined by multi-geophysical observations: Implications for geothermal mechanism","authors":"Song Han ,&nbsp;Liuyang Xu ,&nbsp;Xipeng Shan ,&nbsp;Xi Xu ,&nbsp;Xingtao Kuang ,&nbsp;Yanyun Sun ,&nbsp;Baodi Wang","doi":"10.1016/j.tecto.2025.230723","DOIUrl":"10.1016/j.tecto.2025.230723","url":null,"abstract":"<div><div>The Zhenghe-Dapu fault (ZDF), situated in the Cathaysia Block of South China, has played a major role in the tectono-magmatic and geothermal activities in the region since Mesozoic-Cenozoic. However, the regional topography restricts the availability of surface heat flow data, hindering lithospheric thermal structure studies. Therefore, we used a broadband and long-period magnetotelluric profile with 33 points across the Cathaysia Block and ZDF to obtain a 3-D electrical conductivity model. Tectonic zones, such as the Jiangshao fault and ZDF exhibit high-resistivity (&gt;1000 Ωm) blocks, interpreted as remnants of the cratonic lithosphere; low-conductivity areas (&lt;100 Ωm) indicate lithosphere modified by materials derived from the deep mantle. A high-conductivity body (&lt;10 Ωm) in the lower crust (~20–30 km) beneath the ZDF coincides with spatial position of low magnetic anomalies, high gravity, and low S-wave velocity. Moho depth (~34 km) is significantly greater than that in the adjacent areas (~28–32 km). Integrated geophysical observations suggest that the high-conductivity body may represent mantle-derived melt fluids ascending along faults, leading to the partial melting of lower crustal rocks. Mantle intrusion led to the thickening of the lower crust, that previously underwent regional thinning, ultimately resulting in the formation of a substantial amount of Mesozoic granite bodies, the radiogenic heat of which constitutes a major heat source. Since the Cenozoic, asthenospheric thermal material upwelling, magmatic underplating, and volcanic activity have provided heat to the upper crust. The radiogenic heat from the Mesozoic granites and Cenozoic magmatic-hydrothermal activities together contributed to the regional thermal anomaly, as supported by our resistivity model.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"906 ","pages":"Article 230723"},"PeriodicalIF":2.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792672","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":"Active faulting in Samos Basin, Eastern Aegean Sea, Greece and paleogeographic implications","authors":"Dimitrios Papanikolaou ,&nbsp;Paraskevi Nomikou ,&nbsp;Danai Lampridou ,&nbsp;Jonas Preine ,&nbsp;Dimitris Litsas ,&nbsp;Yannis Tsaparas ,&nbsp;Ilias Koliopanos ,&nbsp;Maria Petroulia ,&nbsp;Christian Huebscher","doi":"10.1016/j.tecto.2025.230724","DOIUrl":"10.1016/j.tecto.2025.230724","url":null,"abstract":"<div><div>The geological analysis of the Samos Island region, particularly the Samos Basin, based on seismic profiling, has revealed a complex tectonic history marked by significant deformation and seismic activity. The Mw 7.0 earthquake in October 2020 is linked to the activation of the <em>E</em>-W marginal fault, resulting in the formation of a south-tilted half-graben. This was followed by aftershocks ranging from Mw 3.2 to 4.5, which correspond to the activation of smaller normal faults, mainly within the Vathy Hills. No significant deformation extends into the eastern margin of the Ikaria Basin, likely due to the different orientations and dips between the Samos Basin faults (<em>E</em>-W, dipping 40° N) and those in the Eastern Ikaria Basin (NE-SW, dipping 65° NW). The eastern Ikaria segment represents the primary seismic hazard for the Samos area, with a potential magnitude of 6.5. Low-angle normal faults of Tortonian age have been identified primarily in the eastern Vathy Hills and along the western segment of the <em>E</em>-W marginal fault of Samos, separating the basement from the overlying sediments. The basement is found beneath the Eastern Samos Basin and Vathy Hills but deepens to over 1600 m to the west. The overall deformation shows a significant westward increase, with displacements 4–5 times greater (700 m vs. 3300 m) over 50 km from Eastern Samos to Eastern Ikaria. Stratigraphic analysis indicates an eastward sea transgression during the Middle-Late Pleistocene over Messinian-Pliocene continental deposits. Canyons and landslides are observed along the southern margin of Samos. The paleogeographic evolution includes the uplift of the metamorphic basement during the Early Miocene, followed by the formation of continental sedimentary basins in the Middle-Late Miocene, marked by N-S marginal faults and volcanic activity. The Samos Island horst emerged due to <em>E</em>-W faulting, with the subsidence of the Samos Basin occurring during the Early-Middle Pleistocene.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"905 ","pages":"Article 230724"},"PeriodicalIF":2.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"3-D seismic delineation of the North Anatolian Fault System shear zone in the Western Half of Marmara Basin, Türkiye","authors":"Ö. Yilmaz ,&nbsp;Z. Özer ,&nbsp;D.T. Beşevli ,&nbsp;J.E.L. Wu ,&nbsp;C. Özsoy ,&nbsp;S. Sevinç ,&nbsp;K.B. Bakioglu ,&nbsp;M.B. Ercengiz ,&nbsp;Ö.K. Şahin ,&nbsp;B. Dadak ,&nbsp;T. Hastürk ,&nbsp;Ö. Yapar ,&nbsp;H. Dalabasmaz ,&nbsp;N.Ö. Sipahioglu ,&nbsp;C. Demirci ,&nbsp;R.Ö. Temel ,&nbsp;M.F. Akalın ,&nbsp;M.S.B. Sadioglu","doi":"10.1016/j.tecto.2025.230726","DOIUrl":"10.1016/j.tecto.2025.230726","url":null,"abstract":"<div><div>We performed a 3-D AI-based structural interpretation of a seismic image volume derived from 3-D prestack time migration, and delineated fault geometries and the subsidiary Riedel shear fractures within the sedimentary overburden associated with the North Anatolian Fault System (NAFS) in the western half of Marmara Basin, Türkiye. We thus inferred existence of dextral strike-slip basement fault segments with extensional (releasing) and contractional (restraining) stepovers that gave rise to the formation of the geomorphic features --- the pull-apart Tekirdağ and Central Basins, and the Western High pop-up structure, respectively. The NAFS shear zone within the study area extends <em>E</em>-W and has a 20-km maximum N-S width. Previous investigations based on 3-D inversion of gravity data over the Sea of Marmara and the surrounding region, and long-range <em>E</em>-W seismic refraction profiling across the basin infer that the Moho depth is as shallow as 24 km in the western half of Marmara Basin --- nearly 6 km shallower than the average regional depth of 30 km. The Moho uplift forms a fairly narrow ridge (&lt;30 km) confined to the NAFS shear zone, coincident with the <em>E</em>-W principal strike direction of the NAFS. This implies that it may have been formed contemporaneously with the formation of the pull-apart basins which gave rise to crustal stretching within the stepovers, resulting in basin subsidence, crustal thinning, and Moho uplift. The segmentation in the NAFS and the <em>E</em>-W trending Moho ridge may have led to the formation of earthquake rupture barriers and weak zones in the brittle upper crust.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"905 ","pages":"Article 230726"},"PeriodicalIF":2.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783675","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":"Tectonic and magmatic segmentation interlinkage in the central main Ethiopian rift","authors":"Shimels Wendwesen ,&nbsp;Abera Alemu ,&nbsp;Wubamlak Nigussie ,&nbsp;Kevin Mickus ,&nbsp;Simeneh Wassihun ,&nbsp;Habtamu Wuletawu ,&nbsp;Yoseph Muhabaw","doi":"10.1016/j.tecto.2025.230725","DOIUrl":"10.1016/j.tecto.2025.230725","url":null,"abstract":"<div><div>The Main Ethiopian Rift (MER) presents a spectrum of rift sector evolution from embryonic continental rifting in the south to incipient oceanic spreading in the north. The central sector of the MER (CMER) remains relatively immature, characterized by strain accommodation through border faults, axial magmatic segments, and off-rift magmatic zones. However, understanding of the tectonic and magmatic segmentation within this sector is relatively incomplete. This study investigates the CMER at a crustal scale, utilizing gravity data to analyze the nature of tectonic segmentation (TS). While previous studies only considered the Aluto-Gedemsa magmatic segment (MS) within the CMER, our work maps three distinct MS for the first time: Tullu Moye-Gedemsa-MS, Aluto-MS, and Corbetti-Shalla-MS, based on subsurface imaging using gravity data. We find that the distribution of surface faults correlates with subsurface magmatic intrusion zones within the Tullu Moye-Gedemsa and Boseti-Kone MS, indicating a clear interlinkage between tectonic and magmatic segmentation and suggesting the TS stage of the region. In contrast, the absence of such association in the Corbetti-Shalla and Aluto-MS regions suggests that the southern section of the CMER may not be in a stage of TS.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"905 ","pages":"Article 230725"},"PeriodicalIF":2.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783587","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}