Journal of Geophysical Research: Solid Earth最新文献

{"title":"Mechanisms for Layered Anisotropy and Anomalous Magmatism of Alaska Subduction System Revealed by Ambient Noise Tomography and the Wave Gradiometry Method","authors":"Zhijin Liu, Chuntao Liang, Feihuang Cao, Xingli Fan, Chunmei Chen","doi":"10.1029/2024jb029105","DOIUrl":"https://doi.org/10.1029/2024jb029105","url":null,"abstract":"Seismic anisotropy can provide valuable constraints for the study of subduction zone dynamics. This study presents a high-resolution 3-D azimuthally anisotropic shear wave velocity model down to 230 km beneath Alaska via ambient noise tomography and wave gradiometry method. The model reveals layered anisotropy patterns related to subduction tectonics. The shear wave's fast directions in the Aleutian fore-arc region exhibit trench-parallel, trench-normal, trench-parallel, and trench-normal variation relative to the trench trend with increasing depth. This anisotropic pattern may be attributed to the strike of fractures or faults in the overlying North American plate, subduction-driven mantle wedge corner flow, preexisting fabrics in the subducting Pacific Plate, and entrained flow in the sub-slab mantle, respectively. The depth-dependent anisotropy pattern in the back-arc mantle wedge reflects subduction-induced corner flow, altered by the subducting slab's changing geometry. Moreover, the model provides new insights into the anomalous magmatism in the Alaskan subduction system. The 3-D isosurface clearly shows the relatively high mantle wedge velocities beneath the Denali Volcanic Gap (DVG), suggesting a relatively dry and cold mantle wedge for the flat-slab subduction of Yakutat slab. The absence of a magma source likely caused the DVG. The Wrangell Volcanic Field (WVF) is characterized by a similar depth-dependent anisotropy pattern to the Aleutian-Pacific subduction system, providing additional evidence for the presence of Wrangell Slab. The formation of WVF may be the result of combined effects of toroidal mantle upwelling around the edge of the Wrangell Slab and melting due to dehydration of the Wrangell Slab.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"28 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940187","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":"Stochastic Multi-Observables Inversion for the 3D Thermochemical Structure of Lithosphere in Spherical Coordinates: Theory and Synthetic Examinations","authors":"Yi Zhang, Yixian Xu","doi":"10.1029/2024jb029717","DOIUrl":"https://doi.org/10.1029/2024jb029717","url":null,"abstract":"The physical properties of the lithospheric and upper mantle's rock are determined by its composition and the in situ temperature and pressure conditions. Together, they have been referred to as the thermochemical structure. Information about the upper mantle's thermochemical structure could be obtained using methods from different disciplines of the earth sciences, in which the geophysical approaches show potential to map the 3D variations on both the regional and global scales. Thus, techniques for investigating the thermochemical structure in the spherical coordinates are needed, including forward modeling of the geophysical observables, calculating schemes of the thermophysical properties for the lithologies, and effective inversion algorithm, which is particularly important for large-scale applications. This paper first demonstrates an adaptive meshing architecture based on the tetrahedral mesh by the sophisticated constructions in a spherical shell. Techniques that enable rapid calculations of the thermophysical properties of the upper mantle's rocks are introduced in length. Methodologies for constructing 3D thermochemical models and forward modeling geophysical observations, including an inversion sub-routine that couples the lithostatic pressure and density variations to forward modeling, are introduced and examined in detail using synthetic data sets. We then introduce methods for determining 3D thermochemical structures of the upper mantle. The inverse problem is treated as a multi-task evaluation process and solved using advanced stochastic optimizing techniques. Estimated uncertainties of the resultant thermochemical models are obtained simultaneously for error analysis. The proposed forward modeling and inversion techniques are validated using synthetic data sets in both forward and inversion circumstances. Limitations and further developments are discussed in the subsequent concluding remarks.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"79 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936424","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":"Microseism Amplitude and Wave Power in the Mediterranean Sea (1996–2023)","authors":"Alfio Marco Borzì, Andrea Cannata, Francesco Panzera, Sebastiano D’Amico, Carlo Lo Re, Richard C. Aster","doi":"10.1029/2024jb030528","DOIUrl":"https://doi.org/10.1029/2024jb030528","url":null,"abstract":"In this work, we integrate seismic data recorded by nine coastal Mediterranean seismic stations and wave hindcast data for 1 January 1996 through 15 October 2023. We examine the relationships between the ocean wave-generated microseism signal (the most continuous and ubiquitous seismic signal on Earth) in terms of temporally varying spectral content, root mean square amplitude, and microseism power spectral density, with the main features of principal ocean wave attributes, specifically significant wave heights, wave period and wave power. To explore relationships between microseism and sea state, we performed a correlation analysis between seismic root square mean amplitude and significant wave height time series for the entire Mediterranean Sea for 1996–2023, including retrieving long-term trends for microseism energy and independently estimated wave power and calculating the Spearman correlation coefficient between the two trend time series. Despite the small number of stations available the analysis allows for a useful exploratory study on the microseism and its relationship with Mediterranean Sea state and wave power spanning 27 years. Given the recent increase in the number of regional seismic stations, the growth of data sharing, and the intensification of global warming and climate extreme events, the results and methods explored here can be further implemented and developed in coming years for coastal monitoring purposes in complement with other data sources.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"78 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929734","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":"The Mono Lake and Laschamps Geomagnetic Excursions Recorded by Sediments in the Drake Passage","authors":"Norbert R. Nowaczyk, Liu Jiabo, Frank Lamy, Lester Lembke-Jene, Helge W. Arz","doi":"10.1029/2024jb029835","DOIUrl":"https://doi.org/10.1029/2024jb029835","url":null,"abstract":"The Drake Passage is characterized by strong ocean currents barely allowing the deposition of fine grained sediments. Only in smaller basins protected from these currents sediments are able to settle more or less continuously. Two sediment cores from within the Drake Passage were subjected to magnetostratigraphic analyses. In one core inclinations are too steep while they are too shallow in the other one. Tentatively, directions of both cores were slightly tilted so that the maximum of the inclination distribution aligns with the direction of a geocentric axial dipole. Inclination variations then correlate fairly well, while declinations still show only little congruence. This is interpreted as the result of locally varying bottom currents partly biasing the remanence acquisition processes. Nevertheless, due to the high latitude of the coring site at 58°S, the field vector is mostly dominated by inclination and intensity variations. Directional variations during the documented Mono Lake (34.5 ka) and Laschamps (41.0 ka) geomagnetic excursions are only slightly changed by the applied tilt-correction and afterward correlate very well from core to core. The Mono Lake excursion is characterized by shallow inclinations only, indicating a non-axial dipolar field geometry. The field vector during the Laschamps excursion reaches a fully reversed direction. Both excursions are associated with clear minima in paleointensity. During the Laschamps excursion even a slight field recovery can be observed during the reversed phase of the field vector. Both excursions in Drake Passage sediments are terminated fairly abruptly followed by a more or less steep increase in paleointensity.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"11 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924464","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":"Slip Modeling of Large Earthquakes by Joint Inversion of W-Phase and Back-Projected Images","authors":"Yuyang Peng, Dun Wang, Nozomu Takeuchi, Luis Rivera","doi":"10.1029/2024jb029270","DOIUrl":"https://doi.org/10.1029/2024jb029270","url":null,"abstract":"We present a novel finite fault inversion algorithm that combines W-phase finite fault inversion with Image Deconvolution Back-Projection (IDBP) for the determination of coseismic slip models following large earthquakes. This integrated algorithm leverages the strengths of both methods, enabling rapid determination of moment tensor, slip distribution, and centroid location. The application of this integrated algorithm to the analysis of the 2015/04/25 <i>Mw</i> 7.8 Nepal and the 2013/01/05 <i>Mw</i> 7.5 Craig Alaska earthquakes yielded results closely aligned with detailed post-earthquake studies, highlighting the algorithm's accuracy and reliability. By overcoming inherent limitations of individual methods, it provides a comprehensive understanding of the earthquake source process. The algorithm's potential for automated implementation, requiring few parameters, enhances its suitability for near real-time earthquake analysis.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"20 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924465","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":"Integrated Analysis of Seismic Sources and Structures: Understanding Earthquake Clustering During Hydraulic Fracturing","authors":"Fangxue Zhang, Yunfeng Chen, Ruijia Wang, Hongyu Yu, Hanlin Chen, Fushen Liu, Xuhua Shi","doi":"10.1029/2024jb030008","DOIUrl":"https://doi.org/10.1029/2024jb030008","url":null,"abstract":"The distribution of hydraulic-fracturing-related seismicity is largely controlled by subsurface structures, yet the physical process that governs the redistribution of injected fluids and stress heterogeneity remains underexplored due to a lack of observational constraints. In this study, we monitored an active hydraulic fracturing (HF) well for two months with a surface nodal array of 60 three-component stations. We built a high-resolution catalog comprised of 1369 events (&lt;span data-altimg=\"/cms/asset/7f67a839-ce44-465a-8177-a1e6f8b55766/jgrb57088-math-0001.png\"&gt;&lt;/span&gt;&lt;mjx-container ctxtmenu_counter=\"3\" 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/jgrb57088-math-0001.png\"&gt;&lt;mjx-semantics&gt;&lt;mjx-mrow data-semantic-children=\"6,3,5\" data-semantic-content=\"2,4\" data-semantic- data-semantic-role=\"inequality\" data-semantic-speech=\"negative 1.1 less than upper M less than 2.3\" data-semantic-type=\"relseq\"&gt;&lt;mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"1\" data-semantic-content=\"0\" data-semantic- data-semantic-parent=\"7\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\"&gt;&lt;mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"6\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\" rspace=\"1\" style=\"margin-left: 0.056em;\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"float\" data-semantic-type=\"number\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mn&gt;&lt;/mjx-mrow&gt;&lt;mjx-mo data-semantic- data-semantic-operator=\"relseq,&lt;\" data-semantic-parent=\"7\" data-semantic-role=\"inequality\" data-semantic-type=\"relation\" rspace=\"5\" space=\"5\"&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=\"7\" 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- data-semantic-operator=\"relseq,&lt;\" data-semantic-parent=\"7\" data-semantic-role=\"inequality\" data-semantic-type=\"relation\" rspace=\"5\" space=\"5\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"7\" data-semantic-role=\"float\" data-semantic-type=\"number\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mn&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:jgrb57088:jgrb57088-math-0001\" display=\"inline\" location=\"graphic/jgrb57088-math-0001.png\" xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;semantics&gt;&lt;mrow data-semantic-=\"\" data-semantic-children=\"6,3,5\" data-semantic-content=\"2,4\" data-semantic-role=\"inequality\" data-semantic-speech=\"negative 1.1 less than upper M less than 2.3\" data-semantic","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"73 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142917355","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":"Decoupling of Magnetic Fabrics From Magnetic Remanences: Insights From Migmatites in Central Tianshan, NW China","authors":"Xin Zhu, Bo Wang, Yunpeng Dong, Yan Chen, Hongsheng Liu, Shengsi Sun, Zhenhua Xue, Lingling Zhong, Zhiyuan He","doi":"10.1029/2024jb029473","DOIUrl":"https://doi.org/10.1029/2024jb029473","url":null,"abstract":"The coupling of magnetic fabrics and magnetic remanences is critical in interpreting paleomagnetic data. To estimate whether primary magnetic fabrics imply primary magnetic remanences, and to assess the practicability of metamorphic rocks in magnetic study, we carried out petrographic, geochronological, rock magnetic investigations, and analyses in anisotropy of magnetic susceptibility and paleomagnetism on migmatites in the Central Tianshan, NW China. Petrological observations indicate no significant dynamic recrystallization post to the migmatization. In-situ monazite U-Pb dating suggests that the migmatization happened during ∼314–297 Ma. Rock magnetic results reveal that the magnetic properties of migmatites are dominated by biotites with minor titanomagnetites. Despite the structural and compositional complexities of migmatites, a simple magnetic fabric pattern is observed with concentrated magnetic foliations and dispersed magnetic lineations. The anisotropy degree and shape parameter significantly change from leucosomes, mesosomes to melanosomes, suggesting that the magnetic fabrics should have been acquired during the migmatization. Characteristic remanent magnetization directions were isolated from a quarter of samples with anomalous shallow magnetic inclination. Combined with available geochronological and paleomagnetic results from the Central Tianshan and neighboring blocks, the magnetic remanences preserved in the migmatites were suggested to be obtained at ∼314–303 Ma, later than the acquisition of magnetic fabrics, probably due to thermal remagnetization or resulted from long-term progressive magnetization during tectonic exhumation of migmatites. This study provides an important yet rarely reported example to manifest the decoupling of magnetic fabrics from magnetic remanences. Meanwhile, migmatites are found to be operable materials for magnetic fabric and paleomagnetic studies.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"6 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142917360","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":"Passive Sources and Diffracted Points Imaging Using Combinational Cross-Correlation Imaging Condition","authors":"Tianfan Yan, Yike Liu, Zhendong Zhang, Bin He, Haiwei Wang","doi":"10.1029/2024jb029695","DOIUrl":"https://doi.org/10.1029/2024jb029695","url":null,"abstract":"Time-reversal imaging is a critical technique for characterizing natural earthquakes and artificial sources. Traditional time reversal methods sum the extrapolated wavefields of different receivers to suppress artifacts and obtain images of the sources. Multiplication-based time-reversal imaging uses the product of extrapolated wavefields to provide source images with fewer artifacts and higher resolutions. However, although multiplication among wavefields efficiently suppresses the artifacts, sources with weaker energy are also suppressed. We combined the two imaging algorithms and proposed a combinational cross-correlation reverse time migration (CcRTM) to image multiple sources. First, the receivers were divided into several groups and independently extrapolated in reverse time. Then, <i>n</i> receivers were selected each time, and the geometric mean between the receiver wavefields was calculated. In the third step, images of multiple sources were obtained using the arithmetic mean of all geometric mean results with different receiver combinations. Compared with multiplication-based source location methods, our method retains the root in the geometric mean to preserve the amplitude ratio between the sources. CcRTM can be applied to image diffractions by considering subsurface small-scale diffractors as secondary sources enabling the detection of anomalies smaller than the wavelength limit. To suppress the reflection energy, we introduced an excitation time to restrict the imaging time. Synthetic and field examples demonstrated the accuracy and efficiency of the proposed imaging method.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"27 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142911876","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":"Phases of Magmatism and Tectonics Along the Madagascar-Comoros Volcanic Chain, and Synchronous Changes in the Kinematics of the Lwandle and Somalia Plates","authors":"Anaïs Rusquet, Vincent Famin, Laurent Michon, Xavier Quidelleur, François Nauret, Martin Danišík, Gilles Ruffet, Carole Berthod, Sidonie Revillon, Patrick Bachèlery, Isabelle Thinon, Anne Lemoine, Sylvie Leroy, Sébastien Zaragosi, Simon Thivet, Julien Bernard, Loraine Gourbet, Etienne Médard, Alix Toulier","doi":"10.1029/2024jb029488","DOIUrl":"https://doi.org/10.1029/2024jb029488","url":null,"abstract":"This paper aims to solve the longstanding debate on the origin of the Comoros volcanic archipelago (Mozambique Channel, Indian Ocean) concerning whether it represents a hotspot trail or a boundary between the Lwandle and Somalia plates in possible connection with the East African Rift System (EARS). To achieve this goal, we analyzed rock samples from recently discovered and previously uninvestigated volcanoes and edifices by means of geochemistry and geochronology. Major-trace element analyses and radiometric dating (⁴⁰Ar/³⁹Ar, K-Ar, and (U-Th)/He) allow us to identify a widespread phase of Comorian volcanism initiated at 9–8 Ma, involving the Zélée, Geyser, and Leven banks, three atolls east of the Comoros. Another tectono-magmatic phase initiated at 2.5 Ma led to a N-S widening of seamount volcanism, and to the progressive development of en-échelon NW-SE structures. With this new addition of atolls and seamounts, the Comoros Archipelago becomes a ∼700 km-long, ∼200 km-wide E-W chain extending from the Cenozoic volcanoes of Madagascar to the EARS. The reactivation of this chain at 9–8 and 2.5 Ma coincides with abrupt changes in the motion of the Somalia plate relative to the Lwandle plate, and with plate boundary modifications. The en-échelon reorganization of structures also matches the kinematic evolution of Somalia relative to Lwandle, from transtension (&gt;3 Ma) to pure dextral slip (≤3 Ma) in the northern Mozambique Channel. We conclude that the Madagascar-Comoros volcanic chain is a branch of the EARS and a plate boundary, further strengthening the link between magmatism and the Rovuma-Lwandle-Somalia plate kinematics.","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"11 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142911874","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":"Influence of Initial Slab Dip, Plate Interface Coupling, and Nonlinear Rheology on Dynamic Weakening at the Lithosphere-Asthenosphere Boundary","authors":"Vivek Bhavsar, Margarete Jadamec, Matthew Knepley","doi":"10.1029/2023jb028423","DOIUrl":"https://doi.org/10.1029/2023jb028423","url":null,"abstract":"The slab dip and long-term coupling along the plate interface can vary both between and within subduction zones. However, how the initial slab dip and resistance at the plate interface affect the dynamic viscous resistance of the asthenosphere at the lithosphere-asthenosphere boundary (LAB) is less understood. This paper presents two-dimensional (2D) visco-plastic models that examine the surface plate velocity and dynamic weakening of the asthenosphere as a function of three values of initial slab dip (&lt;span data-altimg=\"/cms/asset/d5ad0044-7936-4d93-9984-f0fd66e0b010/jgrb57054-math-0001.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0001\" display=\"inline\" location=\"graphic/jgrb57054-math-0001.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mn&gt;3&lt;/mn&gt;\u0000&lt;msup&gt;\u0000&lt;mn&gt;0&lt;/mn&gt;\u0000&lt;mi&gt;o&lt;/mi&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000$3{0}^{o}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;, &lt;span data-altimg=\"/cms/asset/fb4b97d8-c90b-43f3-bdc4-5e316a9b4fd5/jgrb57054-math-0002.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0002\" display=\"inline\" location=\"graphic/jgrb57054-math-0002.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mn&gt;4&lt;/mn&gt;\u0000&lt;msup&gt;\u0000&lt;mn&gt;5&lt;/mn&gt;\u0000&lt;mi&gt;o&lt;/mi&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000$4{5}^{o}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;, &lt;span data-altimg=\"/cms/asset/9ad95318-2b84-46ef-b2cf-120dba2445ed/jgrb57054-math-0003.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0003\" display=\"inline\" location=\"graphic/jgrb57054-math-0003.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mn&gt;6&lt;/mn&gt;\u0000&lt;msup&gt;\u0000&lt;mn&gt;0&lt;/mn&gt;\u0000&lt;mi&gt;o&lt;/mi&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000$6{0}^{o}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;) and six upper bounds on the plate interface coupling (&lt;span data-altimg=\"/cms/asset/b6debda3-17be-452a-8660-9e31c361d1b5/jgrb57054-math-0004.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0004\" display=\"inline\" location=\"graphic/jgrb57054-math-0004.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mn&gt;3.1&lt;/mn&gt;\u0000&lt;mo&gt;×&lt;/mo&gt;\u0000&lt;mn&gt;1&lt;/mn&gt;\u0000&lt;msup&gt;\u0000&lt;mn&gt;0&lt;/mn&gt;\u0000&lt;mn&gt;20&lt;/mn&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000$3.1times 1{0}^{20}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;, &lt;span data-altimg=\"/cms/asset/833427c2-8770-49a4-9814-6e6fe2d2ac67/jgrb57054-math-0005.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0005\" display=\"inline\" location=\"graphic/jgrb57054-math-0005.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mn&gt;1&lt;/mn&gt;\u0000&lt;mo&gt;×&lt;/mo&gt;\u0000&lt;mn&gt;1&lt;/mn&gt;\u0000&lt;msup&gt;\u0000&lt;mn&gt;0&lt;/mn&gt;\u0000&lt;mn&gt;21&lt;/mn&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000$1times 1{0}^{21}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;, &lt;span data-altimg=\"/cms/asset/e1202410-e96b-447e-a0a6-c1a0879f14e6/jgrb57054-math-0006.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0006\" display=\"inline\" location=\"graphic/jgrb57054-math-0006.png\"&gt;\u0000&lt;semantics&gt;\u0000&lt;mrow&gt;\u0000&lt;mn&gt;3.1&lt;/mn&gt;\u0000&lt;mo&gt;×&lt;/mo&gt;\u0000&lt;mn&gt;1&lt;/mn&gt;\u0000&lt;msup&gt;\u0000&lt;mn&gt;0&lt;/mn&gt;\u0000&lt;mn&gt;21&lt;/mn&gt;\u0000&lt;/msup&gt;\u0000&lt;/mrow&gt;\u0000$3.1times 1{0}^{21}$&lt;/annotation&gt;\u0000&lt;/semantics&gt;&lt;/math&gt;, &lt;span data-altimg=\"/cms/asset/3db4f597-2f1d-42c9-8de6-0630ef04c17e/jgrb57054-math-0007.png\"&gt;&lt;/span&gt;&lt;math altimg=\"urn:x-wiley:21699313:media:jgrb57054:jgrb57054-math-0007\" display=\"inline\" location=\"graphic/jgrb57054-math-0007","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"24 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142911875","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}