地球科学最新文献

{"title":"Magma sources, crustal storage depths, and degassing of alkalic, CO2-rich magmas at Nyiragongo and Nyamulagira Volcanoes, Democratic Republic of the Congo","authors":"Lissie Connors ,&nbsp;Paul J. Wallace ,&nbsp;Kenneth W.W. Sims ,&nbsp;D. Matthew Sublett Jr. ,&nbsp;Robert J. Bodnar","doi":"10.1016/j.epsl.2025.119477","DOIUrl":"10.1016/j.epsl.2025.119477","url":null,"abstract":"<div><div>Nyiragongo and Nyamulagira are two of the most active volcanoes in the East African Rift System, producing some of the highest fluxes of volcanic CO₂ and SO₂ on Earth, yet pre-eruptive volatile constraints at these volcanoes remain sparse. Here, we report the geochemistry of melt inclusions (MI) from Mg-rich tephra erupted from flank cones of Nyamulagira and Nyiragongo. In our sample suite, CO₂ concentrations in bubble-corrected melt inclusions reach ∼1.3 and 0.9 wt% for Nyiragongo and Nyamulagira, respectively. Water concentrations are 0.8–1.6 wt% for primitive compositions and 0.2–0.4 wt% for more evolved compositions. Sulfur concentrations reach up to 3100 ppm at Nyiragongo and 2500 ppm at Nyamulagira. Major element ‘fingerprinting’ of MI shows that some tephra samples have MI with both Nyamulagira and Nyiragongo-type compositions, requiring mixing of olivine originally crystallized from multiple distinct magma types. Volatile solubility modeling yields a wide range of crystallization depths for more primitive magmas, with maximum values of ∼10–18 km, compared to &lt;5 km for more evolved magmas erupted at the Nyamulagira summit. Estimated CO₂ concentrations for primary melts based on final equilibration with a lherzolite residue at mantle depths are 6.0 ± 2.5 wt% for Nyiragongo and 4.4 ± 2.5 wt% for Nyamulagira. Major element and volatile data are consistent with magma generation in metasomatized lithospheric mantle domains (metasomes) of amphibole+clinopyroxene+lesser phlogopite, with high initial CO₂ sourced from carbonate phase(s). Degassing models of CO₂, H₂O, and S show that gas compositions at the two volcanoes can be explained by evolved magmas feeding summit lava lakes by a process of conduit convection and degassing.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"665 ","pages":"Article 119477"},"PeriodicalIF":4.8,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From value chain to value networks: Inferences for local development from the Kiwifruit sector in Eastern Himalayan Region, India","authors":"Kishor Goswami ,&nbsp;Nabajyoti Deka ,&nbsp;Jigyasa Sandilya ,&nbsp;Dwiti Baruah Thapa","doi":"10.1016/j.apgeog.2025.103683","DOIUrl":"10.1016/j.apgeog.2025.103683","url":null,"abstract":"<div><div>Value chains have often been a part of the discourse on promoting local development, including in the context of agrarian societies. Lately, the idea of value networks, which is extended from the concept of value chain, is also gaining importance due to its ability to help navigate through the interconnectedness of various entities involved in the process of value co-creation, exchange, and capture. We see an opportunity to apply the value network perspective in furthering the discourse on local development, especially in remote rural contexts where the communities depend on agriculture and allied activities. In this study, we consider the case of the emerging kiwi production sector in the Eastern Himalayan Region of India and analyze it by combining the traditional value chain and the value network perspectives. Our study is mainly based on primary data collected using different tools and techniques from various stakeholders of the kiwifruit sector in the study region. We first conduct a value chain mapping and analysis to discuss the value chain upgrading opportunities. Subsequently, we critically appraise how value (economic and non-economic) is co-created and captured in the identified value network. When juxtaposed with the linear value chain perspective, the value network perspective provided us with greater clarity on the role played by a larger set of actors and their interconnectedness in co-creating value. These actors interact in ways that lead to the development of dynamic capabilities and competencies in the network, promoting resilience and characterizing the development of the local economic system based on local interventions.</div></div>","PeriodicalId":48396,"journal":{"name":"Applied Geography","volume":"181 ","pages":"Article 103683"},"PeriodicalIF":4.0,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212755","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":"231Pa/230Th ratios in the Atlantic and Indian Oceans and their implications for the application of the ratios as an ocean circulation proxy","authors":"Anne L. Leal ,&nbsp;Robert F. Anderson ,&nbsp;Alexandra Bausch ,&nbsp;Martin Q. Fleisher ,&nbsp;Sunil Kumar Singh ,&nbsp;Yong Lao ,&nbsp;Venkatesh Chinni ,&nbsp;Roger Francois","doi":"10.1016/j.quascirev.2025.109448","DOIUrl":"10.1016/j.quascirev.2025.109448","url":null,"abstract":"<div><div>Unsupported ²³¹Pa/²³⁰Th ratios have been used widely as a paleoproxy for ocean circulation and as a paleoproductivity proxy; however, some of the inherent assumptions for these proxies have not been thoroughly tested, which would impact how the ratio is interpreted in different regions. Both applications of the ratio influence interpretations of past climate changes, so it is important to determine the extent to which each process impacts the sedimentary ²³¹Pa/²³⁰Th values. Here, we compare ²³¹Pa/²³⁰Th ratios between the Atlantic, Indian, and Pacific Oceans, and within the Atlantic Ocean, as a test of whether or not this ratio serves as a reliable proxy for water mass ventilation age, which is closely related to ocean circulation.</div><div>In this study, we present new ²³¹Pa and ²³⁰Th measurements from Indian and Atlantic Ocean sediments and from Indian Ocean seawater samples, alongside previously published Atlantic Ocean water column and sedimentary ²³¹Pa/²³⁰Th ratios. The observed water column dissolved ²³¹Pa/²³⁰Th profiles do not show the expected increase in ratio values with water mass age, which disagrees with the conceptual model for the use of ²³¹Pa/²³⁰Th as a paleocirculation proxy. Dissolved ²³¹Pa/²³⁰Th varies between 0.35 and 0.75 within the depth range of NADW, and there is no apparent correlation with water mass age. The observed ²³¹Pa/²³⁰Th values and profiles are strikingly similar between the western North Atlantic, Western Indian, and North Pacific Oceans, even though these basins have significantly different water mass histories and deep water mass ages.</div><div>The water column ²³¹Pa/²³⁰Th values then determine the ratio value of the underlying sediments. So, we then compare ²³¹Pa/²³⁰Th values from Holocene sediments between the ocean basins to determine if the observations agree with our understanding of modern ocean circulation. Atlantic and Indian Ocean sediments are indistinguishable from each other with respect to their ²³¹Pa/²³⁰Th ratios. Taken together, these results indicate that factors other than ventilation age must significantly impact ²³¹Pa/²³⁰Th ratios, and the evidence suggests that fractionation and scavenging intensity may strongly impact particulate and sedimentary ²³¹Pa/²³⁰Th.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"363 ","pages":"Article 109448"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleoclimatic implications of glacial fluctuations in the Sierra Nevada del Cocuy, northern Andes, Colombia, during the Lateglacial and Holocene","authors":"Jordan N. Herbert ,&nbsp;Gordon R.M. Bromley ,&nbsp;Meredith A. Kelly ,&nbsp;Alice M. Doughty ,&nbsp;Daniel Ruiz-Carrascal ,&nbsp;Sergio A. Restrepo-Moreno ,&nbsp;Santiago Noriega Londoño ,&nbsp;Peter Galloway ,&nbsp;Alan J. Hidy","doi":"10.1016/j.quascirev.2025.109458","DOIUrl":"10.1016/j.quascirev.2025.109458","url":null,"abstract":"<div><div>The reconstruction of former mountain glaciers from geomorphic mapping and cosmogenic-nuclide surface-exposure dating provides a unique opportunity to infer patterns of past terrestrial climate variability. Tropical mountain glaciers are particularly valuable as there are comparatively few terrestrial climate proxies at equatorial latitudes relative to higher latitudes. As the single largest climate zone on Earth, the tropics play an outsized role in mediating global climate via the ocean-atmosphere transfer of latent heat and water vapor. Nonetheless, there remains a persistent gap in our understanding of how the tropics influenced – or were influenced by – the high-magnitude climate shifts of the Late Pleistocene, and whether this high-energy region simply responded to extratropical forcing or was itself a driver of global climatic change. To help address this knowledge gap, we analyzed geologic evidence for past glacial fluctuations in three adjacent valleys in the Sierra Nevada del Cocuy, the highest subrange of the Eastern Cordillera in the Colombian Andes, to provide a terrestrial record of atmospheric temperature during the latter part of Termination 1. Coupled with geomorphic mapping and paleo-snowline reconstructions, our beryllium-10 glacial chronology indicates that glaciers in the humid inner tropics underwent pronounced growth and gradual decay during the Antarctic Cold Reversal (14.5–12.8 ka) and Younger Dryas (12.8–11.7 ka) periods, respectively, following a trend that, according to directly dated moraine records from throughout both polar hemispheres, appears to have been global. While the specific mechanism(s) behind this large-scale behavior remains to be corroborated, we revisit the hypothesis that ocean-atmosphere heat transfer and water vapor flux are key drivers of abrupt Lateglacial temperature fluctuations. Subsequent to the Lateglacial, deglaciation of the Sierra Nevada del Cocuy accelerated during the Early Holocene, a pattern also observed in other tropical glacier records. More recently, the magnitude of snowline rise and glacier retreat over the last two centuries supports the view that modern tropospheric warming is anomalously strong at least relative to the last ∼16,000 years.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"363 ","pages":"Article 109458"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fiber-Seismometer Hybrid Sensing Interferometry: A New Approach to Seismic Imaging and Monitoring","authors":"Jianbo Guan, Feng Cheng, Jianghai Xia, Haoyuan Sun","doi":"10.1029/2024jb031035","DOIUrl":"https://doi.org/10.1029/2024jb031035","url":null,"abstract":"Extreme climate events and geological disasters have intensified the urgency for advancing seismic imaging and monitoring. Despite developments in seismic instrumentation, particularly with seismometers and Distributed Acoustic Sensing (DAS), fine-scale observations remain challenging due to their inherent limitations and deployment configurations. This study introduces a novel hybrid sensing interferometry method that enhances multi-component signal extraction, especially poor horizontal components, through a two-step cross-correlation of DAS and seismometers. A field application near the Qiantang River in Hangzhou illustrates how our proposed framework retrieves high-quality multi-component empirical Green's functions and advances ultra-short duration ambient noise seismic imaging techniques, including surface wave dispersion measurements and horizontal-to-vertical spectral ratio assessments. Our approach also facilitates monitoring of near-surface seismic velocity changes, &lt;span data-altimg=\"/cms/asset/b0843979-d3bc-4a73-96ef-6117a66944be/jgrb57302-math-0001.png\"&gt;&lt;/span&gt;&lt;mjx-container ctxtmenu_counter=\"1\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"&gt;&lt;mjx-math aria-hidden=\"true\" location=\"graphic/jgrb57302-math-0001.png\"&gt;&lt;mjx-semantics&gt;&lt;mjx-mrow&gt;&lt;mjx-mrow data-semantic-children=\"5,3\" data-semantic-content=\"2\" data-semantic- data-semantic-role=\"division\" data-semantic-speech=\"d v divided by v\" data-semantic-type=\"infixop\"&gt;&lt;mjx-mrow data-semantic-annotation=\"clearspeak:simple;clearspeak:unit\" data-semantic-children=\"0,1\" data-semantic-content=\"4\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"implicit\" data-semantic-type=\"infixop\"&gt;&lt;mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mi&gt;&lt;mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"5\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" style=\"margin-left: 0.056em; margin-right: 0.056em;\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mi&gt;&lt;/mjx-mrow&gt;&lt;mjx-mo data-semantic- data-semantic-operator=\"infixop,/\" data-semantic-parent=\"6\" data-semantic-role=\"division\" data-semantic-type=\"operator\" rspace=\"1\" space=\"1\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mi&gt;&lt;/mjx-mrow&gt;&lt;/mjx-mrow&gt;&lt;/mjx-semantics&gt;&lt;/mjx-math&gt;&lt;mjx-assistive-mml display=\"inline\" unselectable=\"on\"&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57302:jgrb57302","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"359 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144219461","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":"Evolving Sediment Structure and Lithospheric Architecture Across the Indo-Burman Forearc Margin From the Joint Inversion of Surface- and Scattered-Wave Seismic Constraints","authors":"Christopher J. W. Carchedi, James B. Gaherty, Joseph S. Byrnes, Stéphane Rondenay, Michael S. Steckler, Rasheed Ajala, Patricia Persaud, Eric A. Sandvol, Md. Samiul Alim, Sanju Singha, Syed Humayun Akhter","doi":"10.1029/2024jb030050","DOIUrl":"https://doi.org/10.1029/2024jb030050","url":null,"abstract":"The Indo-Burman subduction zone represents a global endmember for extreme sediment accretion and is a region characterized by ambiguous tectonic structure. The recent collection of broadband seismic data across the Indo-Burman accretionary margin as part of the Bangladesh-India-Myanmar Array (BIMA) experiment provides an opportunity to investigate the subsurface velocity structure across the incoming plate of an endmember subduction system. We construct a three-dimensional model for seismic shear velocity using a joint inversion of surface- and scattered-wave constraints. Rayleigh-wave phase velocities measured from ambient-noise (12–25 s) and teleseismic earthquakes (20–80 s) constrain absolute shear velocities, while we constrain the locations of and relative contrasts across significant discontinuities in the subsurface using observations from scattered-wave imaging. From the resulting inversion, we observe two model classes that characterize the evolution of consolidation within the markedly slow uppermost sediments and metasediments along a predominantly southwest-to-northeast trend. We interpret variations in deeper seismic structure under two proposed scenarios: (a) a Moho of ∼21–26 km depth underlying a package of metasediments and a thinned basement component, with a slow mantle lithosphere (4.2 km/s) that may contain retained melt from the onset of India-Antarctica seafloor spreading; or (b) a Moho of ∼51–59 km depth underlying a package of metasediments, basement, and a thick slug of mafic material, which may correspond to significant Kerguelen-plume-related underplating. By combining constraints from highly resolved phase-velocity estimates and scattered-wave images, we successfully characterize the lateral transitions across the Indo-Burman forearc margin.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"10 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144219462","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":"Comment on “Debunking the myth of a single Iron Ore Group in the Singhbhum Craton, India” by Jodder et al., 2025 (Precambrian Res., 423, 107800)","authors":"Jordan K. Wright ,&nbsp;Asish R. Basu","doi":"10.1016/j.precamres.2025.107856","DOIUrl":"10.1016/j.precamres.2025.107856","url":null,"abstract":"","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107856"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212754","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":"Periodic Density Structures Around the Plasmaspheric Plume Boundary and Their Association With ULF Waves","authors":"Ting-Yan Xiang,&nbsp;Jie Ren,&nbsp;Qiu-Gang Zong,&nbsp;Zi-Jian Feng,&nbsp;Xin-Yu Ai","doi":"10.1029/2025JA034044","DOIUrl":"https://doi.org/10.1029/2025JA034044","url":null,"abstract":"<p>Here we report that the dynamics of the plasmaspheric plume can be affected by ULF waves based on observations from Van Allen Probes. Probe A observed periodic density structures with regular waveforms when traveling into the plume from its western boundary on 19 August 2013. The crests of the density structures were filled with intense hiss waves and low-energy <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msup>\u0000 <mi>H</mi>\u0000 <mo>+</mo>\u0000 </msup>\u0000 </mrow>\u0000 <annotation> ${mathrm{H}}^{+}$</annotation>\u0000 </semantics></math> that also appeared in the plume. The in-phase relationship between toroidal magnetic field perturbations and density structures in the northern hemisphere indicates that the plume boundary was stretched westward when the field lines were moving westward. These observations indicate that periodic density structures stem from the azimuthal oscillations of the plume boundary under the drive of the fundamental toroidal mode of ULF waves. ULF waves around the plume boundary exhibit the largest amplitude and out-of-phase polarization, and the polarization is changing with MLT across the plume boundary, demonstrating that field line resonance (FLR) occurred at the plume boundary. These observations are consistent with the theoretically predicted characteristics of 3-D FLR associated with the plamspheric plume.</p>","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":"130 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213788","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":"Insights Into Spatiotemporal Evolution of Induced Earthquakes in the Southern Delaware Basin Using Calibrated Relocations From the TexNet Catalog (2017–2022)","authors":"Asiye Aziz Zanjani,&nbsp;Heather R. DeShon,&nbsp;Vamshi Karanam,&nbsp;Alexandros Savvaidis","doi":"10.1029/2024EA004027","DOIUrl":"https://doi.org/10.1029/2024EA004027","url":null,"abstract":"<p>This study presents a comprehensive analysis of induced seismicity (2017–2022) and InSAR-derived surface deformation in the southern Delaware basin. The relocated catalog features improved 3-D locations for 5,453 events from the Texas Seismological Network through nested inversions, rigorous data calibration, and additional S-P phase-time differences for seismic stations within 10 km distance. Time and space variations in absolute and relative earthquake location errors reflect the complicated history of station coverage in the region and the importance of having close-in stations to resolve shallow-depth earthquakes. The mean seismogenic depth of the new catalog is 1.5 km below mean-sea-level, consistent with reactivation of shallow normal faults within the Delaware Mountain Group (DMG) and the Bone Spring Formation driven by shallow saltwater disposal. Linearly segmented, short-wavelength subsidence patterns align with seismically active lineaments interpreted as shallow normal faults, while long-wavelength production-related subsidence signals are radially symmetric and aseismic where they do not coincide with injection hotspots and faults. The revised M2+ catalog maps a reduction in the number of events in the northern and central parts as well as an increase in the number of events in the southeast since 2020, and this signal precedes measurable surface deformation. We posit that this relationship reflects efficient pressure diffusion along permeable northwest-southeast faults and/or the thickening of porous sandstone in the DMG prone to seismic slip. The spatial and temporal patterns of seismicity, uplift-subsidence, and basin-wide fluid extraction and disposal indicate inhomogeneous and time-variant seismic and aseismic deformation under an anthropogenically modulated stress regime.</p>","PeriodicalId":54286,"journal":{"name":"Earth and Space Science","volume":"12 6","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024EA004027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144214176","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":"TS-InSAR assessment of groundwater overexploitation-land subsidence linkage: Hengshui case study","authors":"Yan An ,&nbsp;Qiang Shen ,&nbsp;C.K. Shum ,&nbsp;Fan Gao ,&nbsp;Xu Zhang ,&nbsp;Liming Jiang ,&nbsp;Hansheng Wang","doi":"10.1016/j.ejrh.2025.102489","DOIUrl":"10.1016/j.ejrh.2025.102489","url":null,"abstract":"<div><h3>Study region</h3><div>Hengshui City, situated in the North China Plain (NCP), China, is a semi-arid area characterized by intensive agricultural activities and chronic groundwater overdraft due to scarce surface water availability.</div></div><div><h3>Study focus</h3><div>This study aims to quantify long-term groundwater storage changes and reveal the aquifer system's response mechanisms in a typical multi-aquifer setting. We employ Sentinel-1A data for multi-year time-series interferometric synthetic aperture radar (InSAR) analysis to assess surface deformation patterns in Hengshui City from 2017 to 2024. Seasonal deformation was separated, phase lag was corrected, and confined aquifer head changes incorporated to estimate the elastic skeletal storage coefficient (ESSC) and groundwater storage change (GWSC) in deep aquifers.</div></div><div><h3>New hydrological insights for the region</h3><div>Results show subsidence dominates in Hengshui City, with rates up to 141 mm/year (2017–2024), mainly due to falling confined aquifer heads and delayed aquitard drainage. ESSC ranges from <span><math><mrow><mn>0.98</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span> to <span><math><mrow><mn>3.63</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span>, with annual deep groundwater loss around −0.57 km³ . Overall, aquifer heterogeneity contributes to spatial variability in parameters, causing uneven subsidence and water storage dynamics. This work offers new insights into groundwater monitoring in Hengshui, constraining groundwater-subsidence modeling. It also demonstrates InSAR’s strong capability in detecting subsurface deformation and multi-scale hydrological variations.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"60 ","pages":"Article 102489"},"PeriodicalIF":4.7,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212642","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}