Journal of Geophysical Research: Solid Earth最新文献

Pn Velocity Structure and Anisotropy of the Uppermost Mantle Beneath Southeast Asia 东南亚上地幔Pn速度结构及各向异性

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-24 DOI: 10.1029/2025JB031116

Yuan Li, Jianshe Lei, Jinli Huang, Dapeng Zhao

{"title":"Pn Velocity Structure and Anisotropy of the Uppermost Mantle Beneath Southeast Asia","authors":"Yuan Li, Jianshe Lei, Jinli Huang, Dapeng Zhao","doi":"10.1029/2025JB031116","DOIUrl":"https://doi.org/10.1029/2025JB031116","url":null,"abstract":"Systematic investigation of the uppermost mantle structure beneath Southeast Asia is of great significance to understand the dynamics of oceanic plate subductions, continental collisions, and material upwelling associated with a mantle plume. To obtain high-resolution images of Pn wave velocity structure and anisotropy of the uppermost mantle beneath Southeast Asia, we collect 182,875 high-quality Pn arrival time data of 8,647 local earthquakes recorded at 860 stations from seismograms of temporary HAVESArray and permanent seismic networks in and around Hainan Island, as well as from the ISC-EHB Bulletin. Our results generally align with previous findings but provide new insights into the tectonic evolution and dynamics of the Indochina block and the Hainan mantle plume. The Andaman-Sumatra-Java-Timor and Philippine-Taiwan-Ryukyu arcs, associated with active volcanoes, exhibit prominent low-velocity (low-V) anomalies, whereas trenches and sea basins show higher velocities. Notably, the northwestern part of the Indochina block displays significant low-V anomalies with an NW-SE fast propagation direction (FPD), which are divided into two branches with dominant N-S and NE-SW FPDs at the northwest margin of the Khorat Plateau. This result suggests that southeastward mantle flow of the Indochina block bifurcates when encountering the Khorat Plateau. In addition, distinct velocity anomalies beneath the South China Sea and the southern Indochina block reflect unique traces of material upwelling from the Hainan mantle plume, contributing to the wide distribution of late Cenozoic basalts in Southeast Asia.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144367601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-Dimensional Seismic Velocity Models for the San Francisco Bay Region, California From Joint Body-Wave and Surface-Wave Tomography Validated by Waveform Simulation 通过波形模拟验证的体波和面波联合层析成像在加州旧金山湾地区的三维地震速度模型

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-23 DOI: 10.1029/2025JB031377

Hao Guo, Taka'aki Taira, Avinash Nayak, Clifford Thurber, Evan Hirakawa

{"title":"Three-Dimensional Seismic Velocity Models for the San Francisco Bay Region, California From Joint Body-Wave and Surface-Wave Tomography Validated by Waveform Simulation","authors":"Hao Guo, Taka'aki Taira, Avinash Nayak, Clifford Thurber, Evan Hirakawa","doi":"10.1029/2025JB031377","DOIUrl":"https://doi.org/10.1029/2025JB031377","url":null,"abstract":"A high-resolution seismic velocity model for both P and S waves is essential for the San Francisco Bay (SFB) region to accurately simulate earthquake ground motions and assess seismic hazards in this high-risk region. We present new three-dimensional P-wave and S-wave velocity (Vp and Vs) models of the SFB region developed using joint tomographic inversion with a rich set of earthquake and active-source body-wave data and ambient-noise surface-wave data. We designed a dynamic balance strategy to effectively balance the contributions of body-wave and surface-wave data during each iteration of the inversion. Owing to the complementary resolution of body-wave and surface-wave data, our new models are significantly improved compared to previous tomographic models. Major geologic features in the SFB region, including low-velocity basins, high-velocity Franciscan Complex, granite, and gabbro rocks, and across-fault velocity contrasts, are imaged in our Vp and Vs models. Compared to the geology-based U.S. Geological Survey velocity model, our new model has better defined structures for some important areas that are of great concern for seismic hazard assessment, such as the Sacramento-San Joaquin Delta, and the 2014 magnitude 6.0 South Napa earthquake area. We validated our model by simulating waveforms for a set of moderate-magnitude earthquakes. The good performance of our model in waveform simulation indicates its potential for improving ground motion simulation and seismic hazard assessment in the SFB region.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031377","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144367487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Timing and Style of Final Closure of the Paleo-Asian Ocean: Perspectives From the Big Geodata Analysis and Machine Learning Model 古亚洲海洋最终闭合的时间和方式：来自大地理数据分析和机器学习模型的视角

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-23 DOI: 10.1029/2024JB029877

Jixiang Xue, Keda Cai, Zhenjie Zhang, Kai Wang

{"title":"Timing and Style of Final Closure of the Paleo-Asian Ocean: Perspectives From the Big Geodata Analysis and Machine Learning Model","authors":"Jixiang Xue, Keda Cai, Zhenjie Zhang, Kai Wang","doi":"10.1029/2024JB029877","DOIUrl":"https://doi.org/10.1029/2024JB029877","url":null,"abstract":"The Paleo-Asian Ocean (PAO), was located between the Siberian Craton and the Tarim-North China Craton, and its subduction-closure history are important for studying the evolution of the Central Asian Orogenic Belt that may have uncovered impacts on paleoclimate. However, when and how the PAO closed remains controversial. Additionally, the potential link between the Permian aridification in the northern North China Craton and the subduction-closure processes of the PAO also remains elusive. The closure locations of the PAO are at the South Tianshan Belt, Beishan Belt, Solonker Belt, and Changchun-Yanji Belt, respectively. Here, we apply a LightGBM model to estimate the crustal thickness of the four segments, combined with big geodata analysis methods and geological evidence, to address these scientific issues. The ∼300, ∼280, ∼260, and ∼240 Ma crustal thickening and corresponding zircon εHf(t) isotopic pull-downs of these belts, coupled with flora distribution, sedimentary records, and paleomagnetic data, support that the PAO closed diachronously in a scissor style from west to east during the Late Carboniferous to the Middle Triassic. The new estimate regarding crustal thickness for northern North China by the LightGBM model was 47 ± 8 km during the Early Permian, which corresponded to an elevation of 2.2 ± 0.8 km. Furthermore, the profile of the new paleo-elevation of the northern North China suggests that the topography and elevation are remarkably different from those of the Andean Altiplano plateau, which argues against the interpretation of an Andean-type orogenic plateau resulting in the Permian aridification of the northern North China Craton.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339558","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}

引用次数: 0

Hydration State and Updip Fluid Migration in the Slab Mantle 板块地幔水化状态与上倾流体运移

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-23 DOI: 10.1029/2024JB030609

Nestor G. Cerpa, Ikuko Wada

{"title":"Hydration State and Updip Fluid Migration in the Slab Mantle","authors":"Nestor G. Cerpa, Ikuko Wada","doi":"10.1029/2024JB030609","DOIUrl":"https://doi.org/10.1029/2024JB030609","url":null,"abstract":"Fluid production from dehydration reactions and fluid migration in the subducting slab impact various subduction processes, including intraslab and megathrust earthquakes, episodic slip and tremor, mantle wedge metasomatism, and arc-magma genesis. Quantifying those processes requires a good knowledge of the location and amount of fluid release from the slab and eventual outflux at the top of the slab. Compaction-pressure gradients induced by the dehydration reactions could drive fluid flow in the slab, even in the updip direction, but how the initial hydration in the oceanic mantle prior to subduction impacts the fluid flow has not been investigated. Here, we use a 2-D two-phase flow model to investigate this effect under various initial slab-mantle hydration states and slab thermal conditions, both of which impact the depth extent of the stability of hydrous minerals. We focus on the lateral shift between the site of dehydration reactions and the location of fluid outflux at the top of the slab due to intraslab-updip migration. Our results indicate that major updip fluid pathways form along the antigorite and chlorite dehydration fronts sub-parallel to the slab surface. This, in turn, promotes fluid outflux at the slab surface as shallow as 30–40 km depths. This mechanism is more likely in young slabs (<∼30 Ma) as its warm condition results in a relatively thin (<∼20-km thick) stability zones of hydrous phases in the incoming oceanic mantle, which leads to the formation of the slab-parallel dehydration fronts and updip fluid migration.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030609","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Deep Lithospheric Structure of Terrane Accretion as Revealed Through Patterns of Seismicity Associated With the Collision of the Panamá–Chocó Block and South America Beneath Cauca, Colombia 通过与哥伦比亚考卡地下Panamá-Chocó块体与南美碰撞相关的地震活动模式揭示地体增生的深部岩石圈结构

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-23 DOI: 10.1029/2024JB030067

Brandon T. Bishop, Linda M. Warren, Pablo Aravena, Sungwon Cho, Lillian Soto-Cordero, Patricia Pedraza, Germán A. Prieto, Viviana Dionicio

{"title":"The Deep Lithospheric Structure of Terrane Accretion as Revealed Through Patterns of Seismicity Associated With the Collision of the Panamá–Chocó Block and South America Beneath Cauca, Colombia","authors":"Brandon T. Bishop, Linda M. Warren, Pablo Aravena, Sungwon Cho, Lillian Soto-Cordero, Patricia Pedraza, Germán A. Prieto, Viviana Dionicio","doi":"10.1029/2024JB030067","DOIUrl":"https://doi.org/10.1029/2024JB030067","url":null,"abstract":"The Cauca region is the only documented site in the world where extensive intermediate depth seismicity occurs over multiple decades above a subducting slab. Here, the subducting Nazca oceanic plate descends beneath a mosaic of terranes derived from the Caribbean plate and accreted to continental South America from the Cretaceous to the present. Through relative relocation of >6,000 earthquakes from 2010 to 2019 we show that seismic activity within the Nazca slab is concentrated immediately inboard of the most recently accreted terrane (the Panamá–Chocó Block) and that supraslab seismicity is occurring within the subducted continuation of this terrane. The deepest extent of this seismicity occurs only within the Colombian forearc and a gap in the active volcanic arc, indicating that the continuation of this terrane at depth has perturbed the thermal structure of the subduction zone. This perturbation is likely what permits brittle failure to occur above the slab. Within the context of the long-term evolution of the Colombian subduction zone, this seismicity must represent either a transient phenomenon as the continuation of the Panamá–Chocó Block warms and becomes incorporated into the convecting mantle wedge or a site where fluids released by the subducting Nazca slab have been focused, promoting hydrofracture. While additional tests are necessary to distinguish between these possibilities, seismicity within the Nazca slab is most intense directly beneath the locations where supraslab seismicity is concentrated, consistent with hydrofracture due to fluids escaping the slab. Similar transient processes may have affected terrane accretion in the geologic past.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339553","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}

引用次数: 0

Transient Propagation of Ductile Ruptures by Thermal Runaway 热失控下延性断裂的瞬态扩展

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-21 DOI: 10.1029/2025JB031240

A. Spang, M. Thielmann, A. de Montserrat, T. Duretz

{"title":"Transient Propagation of Ductile Ruptures by Thermal Runaway","authors":"A. Spang, M. Thielmann, A. de Montserrat, T. Duretz","doi":"10.1029/2025JB031240","DOIUrl":"https://doi.org/10.1029/2025JB031240","url":null,"abstract":"Ductile deformation is typically associated with slow and steady-state deformation, yet the occurrence of deep earthquakes, which exhibit a rapid and transient behavior, challenges this view. One proposed mechanism to facilitate such behavior is thermal runaway. However, two-dimensional (2D) models that capture highly localized, transient ductile deformation, driven by thermal runaway, remain unexplored. This study presents 2D simple shear models using the pseudo-transient relaxation method optimized for graphics processing units. The models incorporate a Maxwell rheology including compressible elasticity, diffusion creep, dislocation creep, and low-temperature plasticity. Our models capture the nucleation and transient propagation of highly localized ductile ruptures driven by thermal runaway. Depending on rheological parameters, we observe a spectrum of behaviors: (a) broad shear zones which deform only slightly faster than the boundary conditions; (b) localized deformation which is orders of magnitude faster than far field deformation; and (c) highly localized ruptures reaching seismic slip velocities. Runaway intensity scales with nondimensional numbers derived from 1D studies, but its spatial and temporal evolution is more complex, traversing several stages. The rupture front perturbs the local stress field, generating opposing pressure anomalies of up to 1.5 GPa. For mantle transition zone conditions, thermal runaway-driven ductile ruptures can reach seismic slip velocities, confirming it as a viable mechanism for deep-focus earthquakes. Under brittle-ductile transition zone conditions, our models capture thermal runaway driving accelerated creep which disturbs the local pressure field sufficiently to facilitate brittle failure in an otherwise ductile host rock.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031240","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interconnectivity of Magmatic and Hydrothermal Systems of Aluto Volcano in the Main Ethiopian Rift Inferred From Seismicity 从地震活动性推断埃塞俄比亚主裂谷Aluto火山岩浆和热液系统的连通性

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-20 DOI: 10.1029/2024JB031053

Tesfahiwet Yemane, Thomas Samuel Hudson, John Michael Kendall, Jonathan Blundy, Amdemichael Zafu Tadesse, James O. S. Hammond, Atalay Ayele, Ghebrebrhan Ogubazghi, Sacha Lapins

{"title":"Interconnectivity of Magmatic and Hydrothermal Systems of Aluto Volcano in the Main Ethiopian Rift Inferred From Seismicity","authors":"Tesfahiwet Yemane, Thomas Samuel Hudson, John Michael Kendall, Jonathan Blundy, Amdemichael Zafu Tadesse, James O. S. Hammond, Atalay Ayele, Ghebrebrhan Ogubazghi, Sacha Lapins","doi":"10.1029/2024JB031053","DOIUrl":"https://doi.org/10.1029/2024JB031053","url":null,"abstract":"Aluto volcano, situated in the central Main Ethiopian Rift (MER) within the northern part of the East African Rift System (EARS) is seismically active, with indications of unrest detected by InSAR. It hosts Ethiopia's first pilot project for geothermal energy. Despite extensive studies, uncertainties remain about the mechanisms of unrest and the existence of a shallow magma chamber beneath Aluto which could drive the hydrothermal system, and is crucial for understanding its geothermal potential. This study investigates Aluto's magmatic and hydrothermal systems using observations of seismicity in the region. We analyze seismic data from January 2012 to January 2014, locating 2,393 events, which lie predominantly along the Wonji Fault Belt (WFB). Event depths reach up to 40 km beneath Aluto, suggesting the presence of a highly crystallized body at shallow depth, consistent with previous magnetotelluric and gravity studies. Deep crustal seismicity likely relates to fluid and/or magmatic processes. High b-values of 1.97 ± 0.10 at Aluto indicates the presence of fluids. Seismicity is negligible beneath Silti Debre Zeyt Fault Zone (SDFZ), previously identified as a highly conductive, indicative of melt. Focal mechanisms show normal faulting in the direction of rift extension and full-moment tensor inversions suggest shear-failure with fluids potentially activating existing faults. We suggest that the magmatic and hydrothermal systems are connected through pre-existing faults. Understanding this interaction will enhance our knowledge of the geothermal system, volcanic risk, mechanisms of unrest, and emplacement of geothermal brines.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB031053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144323700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Slip Modes Along a Structurally-Driven Earthquake Barrier in Chile 智利结构驱动的地震屏障滑动模式

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-20 DOI: 10.1029/2024JB030796

Diego Molina-Ormazabal, Mathilde Radiguet, Jannes Münchmeyer, Nicolas Hernandez-Soto, Adrien Vezinet, Lea Pousse-Beltran, Catalina Castro, Marie-Pierre Doin, Juan Carlos Baez, Marcos Moreno, Andres Tassara, Philippe Durand, Anne Socquet

{"title":"Slip Modes Along a Structurally-Driven Earthquake Barrier in Chile","authors":"Diego Molina-Ormazabal, Mathilde Radiguet, Jannes Münchmeyer, Nicolas Hernandez-Soto, Adrien Vezinet, Lea Pousse-Beltran, Catalina Castro, Marie-Pierre Doin, Juan Carlos Baez, Marcos Moreno, Andres Tassara, Philippe Durand, Anne Socquet","doi":"10.1029/2024JB030796","DOIUrl":"https://doi.org/10.1029/2024JB030796","url":null,"abstract":"Oceanic ridges often collocate with seismic barriers and episodic aseismic slip. However, how subducted seafloor topography drives interactions between slow and fast slip remains unclear. Here, using GNSS, InSAR and seismicity, we show interactions between a deep slow slip event (SSE) and a nearby shallow earthquake sequence that occurred in 2020 in northern Chile. These events overlap with the subducted Copiapo ridge, which has served as a barrier for historical earthquake ruptures. Gravity field data and seismic tomography reveal that the SSE nucleated in a region hosting a subducted seamount. Six months later, the seismic sequence dynamically triggered the acceleration and migration of the deep SSE, while afterslip and aftershocks propagated up to another subducted seamount at shallower depth. Our findings suggest that subducted seamounts influence fault hydromechanics, where high pore-pressure and rate strengthening material promote continuous slip release, reducing slip deficit. This process is modulated by SSEs and low magnitude seismic sequences.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030796","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144323682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Are There Thermal Precursors to Eruptions Detectable by ASTER? Evaluating 22 years of Global Medium Resolution Satellite Thermal Observations at 200+ Volcanoes ASTER能探测到喷发的热前兆吗？评估22年来200多个火山的全球中分辨率卫星热观测

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-20 DOI: 10.1029/2024JB030427

A. Gomez-Patron, M. E. Pritchard, X. Peng, A. Downes, C. Crothers, J. Valenza, A. Wada, L. Way, L. Zapata

{"title":"Are There Thermal Precursors to Eruptions Detectable by ASTER? Evaluating 22 years of Global Medium Resolution Satellite Thermal Observations at 200+ Volcanoes","authors":"A. Gomez-Patron, M. E. Pritchard, X. Peng, A. Downes, C. Crothers, J. Valenza, A. Wada, L. Way, L. Zapata","doi":"10.1029/2024JB030427","DOIUrl":"https://doi.org/10.1029/2024JB030427","url":null,"abstract":"Measurements of temperature changes at volcanic features can reveal trends that could forecast eruptions. Using nighttime advanced spaceborne thermal emission and reflection radiometer observations with a spatial resolution of 90 m/pixel, we collect thermal measurements for 195 subaerial volcanoes that erupted at least once between 2000 and 2022 (810 eruptions) to evaluate for thermal precursors. Roughly 28% of eruptions (225) have sufficient nighttime cloud-free observations to construct a robust time series. We use our deviation from thermal time series baseline algorithm to identify temperature observations that vary from the preceding average by a specified number of standard deviations. In our data set, 23% of eruptions were preceded by an increase in temperature, 6% had a decrease in temperature, 15% had an increase-then-decrease trend, 55% had no detectable thermal precursor to eruption, and 69% of volcanoes had a volcanic thermal change not associated with an eruption. Thermal precursors can start as early as 8 years before an eruption to only a week; however, most precursors last less than a year. We also perform chi-square tests to compare precursors with volcanic and eruptive characteristics. We find that all kinds of thermal precursors are present in all volcanic and eruptive characteristics and the size and duration of the precursor do not indicate size of the subsequent eruption. Finally, we find several examples where more temporally dense satellite thermal observations at spatial resolution of 90 m/pixel or better are needed.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144323683","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}

引用次数: 0

A Narrow Magma Conduit of the Changbaishan Volcano Revealed by High-Resolution Receiver Function Imaging 高分辨率接收函数成像揭示长白山火山狭窄岩浆通道

IF 3.9 2区地球科学

Journal of Geophysical Research: Solid Earth Pub Date : 2025-06-20 DOI: 10.1029/2024JB030535

Dong Yan, You Tian, Dapeng Zhao

{"title":"A Narrow Magma Conduit of the Changbaishan Volcano Revealed by High-Resolution Receiver Function Imaging","authors":"Dong Yan, You Tian, Dapeng Zhao","doi":"10.1029/2024JB030535","DOIUrl":"https://doi.org/10.1029/2024JB030535","url":null,"abstract":"The Changbaishan volcano (CBV) is the largest Cenozoic intraplate stratovolcano in Northeast China. Although many seismic imaging studies have been conducted in the CBV area during the past two decades, the detailed crustal structure beneath the Tianchi caldera is still poorly understood due to the sparse seismic observations limited by the harsh natural conditions. In this study, we deployed dense linear seismic arrays along three slopes of the Changbaishan-Tianchi volcanic area for the first time to obtain unprecedented high-resolution images of the crustal structure by using the teleseismic receiver-function imaging technique. Our results reveal detailed variations of crustal interface characteristics beneath the Tianchi caldera and adjacent areas. Several intracrustal interfaces are clearly revealed that correspond well to geological bodies, which might indicate boundaries of consolidated igneous bodies related to the primitive magmatic activities. A continuous Moho discontinuity at ∼37 km depth is revealed, whereas a weak Moho zone with a vertical offset of ∼4 km appears directly beneath the Tianchi caldera, which shows a clear positive correlation with the average crustal Vp/Vs ratio. We deem that the prominent crustal thickening and the higher Vp/Vs ratio beneath the Tianchi caldera might be closely associated with the complicated mantle-derived mafic materials underplating at the crust-mantle boundary. The joint effect of the multilevel magmatic plumbing system and a narrow magma conduit beneath the Tianchi caldera could account for the distinctive bimodal volcanic eruption history of the CBV.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030535","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0