Journal of Geophysical Research: Solid Earth最新文献

{"title":"A Sharp Melt-Bearing Lithosphere–Asthenosphere Boundary Beneath the Korean Peninsula: Evidence From Teleseismic Receiver Functions","authors":"Minkyung Kim,&nbsp;Hyunsun Kang,&nbsp;Gyuchan Park,&nbsp;Jung-Woo Park,&nbsp;YoungHee Kim","doi":"10.1029/2026JB035178","DOIUrl":"https://doi.org/10.1029/2026JB035178","url":null,"abstract":"<p>The lithosphere–asthenosphere boundary (LAB) provides key constraints on how continental lithosphere responds to tectonic processes. Located between the East Asian cratonic blocks and the western Pacific subduction system, the Korean Peninsula (KP) provides an important setting to examine continental lithospheric evolution, yet seismic constraints on its LAB structure remain limited. We use P- and S-receiver functions to investigate crustal and lithospheric structure beneath the southern KP and adjacent volcanic islands. Beneath the southern KP, the LAB lies at ∼70 km depth and is marked by a sharp transition zone (&lt;20 km) and a pronounced shear-wave velocity (<i>V</i>_<i>S</i>) reduction (7%–10%), most plausibly explained by partial melt near the LAB. Thermodynamic modeling predicts melt fractions near the LAB, consistent with independent estimates from <i>V</i>_<i>S</i> reduction. These observations suggest that the southern KP represents the eastern continuation of a tectonically modified domain formed through long-term subduction-related thinning and removal of continental lithosphere. This modification varies laterally within the southern KP, where the southeastern block shows a deeper Moho, shallower LAB, and higher crustal P-to-S wave velocity ratio (<i>V</i>_<i>P</i><i>/V</i>_<i>S</i>) than the northwestern block, indicating lithospheric overprinting by magmatic or thermal processes. Jeju Island retains inland-like Moho and LAB depths, but shows complex <i>V</i>_<i>P</i><i>/V</i>_<i>S</i> variations and a broad lithosphere–asthenosphere transition. In contrast, Ulleung Island exhibits a shallow Moho, low <i>V</i>_<i>P</i><i>/V</i>_<i>S</i>, and an exceptionally shallow LAB, reflecting additional lithospheric modification associated with Miocene backarc extension. Our results link the present-day lithospheric heterogeneity to the multi-stage tectonic evolution of the eastern Eurasian margin.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072533","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":"A Late Cretaceous-Eocene Geomagnetic Polarity Time Scale (MM26) That Combines Marine Magnetic Anomaly Records, Radioisotopic Dates, and Astrochronology","authors":"A. Malinverno,&nbsp;S. R. Meyers","doi":"10.1029/2025JB033130","DOIUrl":"https://doi.org/10.1029/2025JB033130","url":null,"abstract":"<p>The Geomagnetic Polarity Time Scale (GPTS) is essential to date geological events in stratigraphic sequences and to reconstruct plate motions. The first GPTSs were based on the record of magnetic anomalies created by seafloor spreading, calibrated by a few radioisotopic dates. Recently, GPTS construction shifted to astrochronology, where magnetostratigraphy is dated from astronomical cycles recorded in selected sediment sequences. We construct here a MM26 GPTS for the Late Cretaceous-Eocene (magnetochrons C33–C13, ∼83–33 Ma) based on three data sources: 20 radioisotopic dates, 97 magnetochron durations from astrochronology, and 154 ship tracks of magnetic anomalies from thirteen mid-ocean ridge flank regions. Whereas current practice concentrates on the best records dated by astrochronology, we argue here that the combination of diverse types of data that have independent errors provides a better constrained GPTS. Starting from a Bayesian formulation, a Markov chain Monte Carlo (MCMC) algorithm generates a large sample of GPTSs that fit radioisotopic and astrochronology data while minimizing global spreading rate fluctuations. Best estimates of the GPTS ages and durations are the averages of the MCMC sampled values, and uncertainties are quantified by the sample standard deviations. Numerical experiments that use only some data sources to constrain the MCMC sampling show that time scale uncertainty is minimized when all data types are included. Finally, the GPTS confirms a global plate motion change at 50–45 Ma, when India-Eurasia collision slowed spreading in the Indian Ocean while spreading rates concurrently increased in the Northern Pacific and South Atlantic.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB033130","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072536","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}

{"title":"Effects of Bulk Poroelasticity on Repeating Earthquake Sequences: Insights From Numerical Modeling","authors":"Linxuan Li,&nbsp;Nadia Lapusta","doi":"10.1029/2026JB034308","DOIUrl":"https://doi.org/10.1029/2026JB034308","url":null,"abstract":"<p>At seismogenic depths, faults and the surrounding rock are saturated with water. Fault slip induces volumetric strains in the bulk, causing compression or dilation of pore fluid, which alters pore pressure—a phenomenon known as the poroelastic effect. This pore pressure change can, in turn, influence fault slip behavior. However, most prior earthquake source models have neglected or oversimplified this effect. In this study, we simulate repeating earthquake sequences on a 1D fault embedded in a 2D poroelastic medium. The fault is modeled as a leaky shear zone with finite width and a linear pore-pressure distribution. Shear resistance is governed by a rate-and-state friction law, with effective normal stress accounting for pore-pressure changes. Our results show that poroelastic effects on fault slip strongly depend on assumptions about slip localization and can affect recurrence intervals and the ratio of seismic to total slip. Using the mean pore pressure over the shear-layer thickness in the effective normal stress leads to earthquake sequences comparable to the undrained limit for realistic bulk diffusivities, which can be mimicked using elastic models with undrained (larger) elastic moduli. These models are more stabilizing than those with drained moduli. Using the maximum pore pressure over the shear-layer thickness introduces further weakening, increasing seismic fault slip, while using pore pressure on one side of the shear layer leads to more complex rupture patterns and reduced seismic slip. Our findings emphasize the importance of incorporating poroelastic effects into earthquake source models and understanding how slip localizes within the shear zone.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072535","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":"Seismic Versus Sub-Seismic Experimental Mirror-Like Fault Surfaces in Bituminous Dolostones","authors":"M. Chinello,&nbsp;S. Aretusini,&nbsp;E. Spagnuolo,&nbsp;J. Nava,&nbsp;T. Tesei,&nbsp;M. Fondriest,&nbsp;G. Di Toro","doi":"10.1029/2025JB033734","DOIUrl":"https://doi.org/10.1029/2025JB033734","url":null,"abstract":"<p>Mirror-like Surfaces (MSs) are ultra-polished surfaces frequently found in exhumed seismogenic fault zones in carbonates. They form over a wide range of pressure-temperature conditions and slip rates, from seismic (≈1 m/s) to sub-seismic (≈0.1–100 μm/s), reflecting distinct phases of the seismic cycle. Motivated by the abundance of MSs in bituminous dolostones from the Central Apennines (Italy), we performed rotary-shear experiments at seismic and sub-seismic slip rates on incohesive samples under water-dampened and room-humidity conditions, to determine the conditions favoring MSs formation. MSs developed under all tested conditions, regardless of water content. Mechanical data indicate that, compared to pure dolomite, the presence of bitumen lowers the friction coefficient and promotes slip-neutral behavior at seismic slip rate. FEG-FIB-SEM microstructural investigations revealed that all experimental MSs consist of a 10s-nm-thick film of rounded nanoparticles ≈5–15 nm in diameter. Subtle microstructural differences emerged in the “room-humidity” MSs. The “sub-seismic” MSs display nanoparticles arranged in sub-spherical aggregates measuring a few 10s nm. Differently, “seismic” MS is cut by micro-cracks due to thermal contraction or desiccation, and nanoparticles are arranged in flat, sub-rounded aggregates measuring 5–150 nm. Changes in porosity, grain size and foliation are observed in the firsts μm of the slip zone under all the “seismic” MSs. These results suggest that MSs represent a morphological convergence of physical and chemical processes acting across a broad range of deformation conditions. However, micro- to nano-scale structural features, if preserved in natural faults, may help distinguish between “seismic” and “sub-seismic” MSs, with implications for seismic hazard assessment.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB033734","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072534","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}

{"title":"Dual Magnetite Formation Pathways in Abyssal Serpentinites From the Mid-Atlantic Ridge","authors":"Weiwei Wu,&nbsp;Yan Liu,&nbsp;Lin Xing,&nbsp;Chaoqun Zhang,&nbsp;Kelei Zhu,&nbsp;Chuanzhou Liu,&nbsp;Andrew P. Roberts,&nbsp;Alessio Sanfilippo,&nbsp;Yongxin Pan,&nbsp;Jinhua Li","doi":"10.1029/2026JB033865","DOIUrl":"https://doi.org/10.1029/2026JB033865","url":null,"abstract":"<p>Serpentinization, which involves hydrothermal alteration of olivine and pyroxene in ultramafic rocks, generates magnetite and strongly modifies the magnetic properties of oceanic lithosphere. However, the microstructural pathways of magnetite formation and their bulk magnetic expression remain insufficiently constrained. Here we integrate petrography, mineral chemistry, rock magnetism and electron microscopy on abyssal peridotites from the Mid-Atlantic Ridge (7–8°N) to resolve two end-member pathways controlled by protolith mineralogy. In moderately serpentinized samples, olivine alteration produces lizardite and magnetite. Magnetite first nucleates as nanocrystalline clusters within the lizardite matrix and grows by coalescence into submicron dendritic and clustered aggregates that are dominated by vortex domain states. With increasing alteration, progressive oxidation and cation substitution drive magnetite away from stoichiometry, expressed by a suppressed Verwey transition and elevated Curie temperatures. In contrast, orthopyroxene alteration yields serpentine/chlorite mixtures, together with systematic modification of Mg-Al spinel. With increased alteration, Mg-Al spinel is replaced sequentially by Cr-Fe chromite and then by Cr-rich magnetite, accompanied by coherent chemical and magnetic changes and the development of crystallographically oriented Cr-bearing magnetite grains. These divergent olivine- and pyroxene-derived pathways produce complementary magnetic carriers and fabrics within the same serpentinite body. Our results demonstrate that protolith mineralogy exerts a first-order control on serpentinite magnetism and provide a process-based framework for interpreting serpentinization-related magnetic anomalies and mantle-derived magnetic signatures at slow spreading ridges.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072544","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":"Propagation of Subduction Polarity Reversal Along Arc-Continent Convergent Margin: Insights From 3D Geodynamic Simulations","authors":"Shengxing Zhang,&nbsp;Yifei Wang,&nbsp;Wei Leng","doi":"10.1029/2026JB034648","DOIUrl":"https://doi.org/10.1029/2026JB034648","url":null,"abstract":"<p>Subduction polarity reversal (SPR) driven by arc-continent collision stands as a crucial process to establish new subduction zones throughout the Phanerozoic. Despite its inherent 3D nature, investigations of SPR along extensive arc–continent collision margins have largely been confined to 2D models, providing limited perspectives on the collision-perpendicular propagation of SPR and the associated tectonic evolution. In this study, we establish a 3D numerical model to examine the geodynamic viability and tectonic responses of SPR propagation in the context of arc-continent collision. Through systematic parameter testing, we demonstrate that the SPR propagation can only occur when the subducting lithosphere is both thermally aged and rheologically strong. In contrast, simulations involving young or rheologically weak lithosphere result in slab tearing or slab break-off, thereby interrupting SPR propagation. Our study offers new geodynamic insights into how the extensive Vitiaz and Andaman–Sumatra trenches were initiated and why slab tearing occurs in the Philippine and Vanuatu subduction zones.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072532","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":"Episodic Change, Quiescence, and Recovery of Earth's Inner Core Surface","authors":"Xin Zhang,&nbsp;Lianxing Wen","doi":"10.1029/2026JB034595","DOIUrl":"https://doi.org/10.1029/2026JB034595","url":null,"abstract":"<p>While a consensus has emerged that the hypothesis of inner core differential rotation cannot provide a consistent explanation for the seismic data, it remains debated whether the seismic data indicate a concurrence of a temporal change of inner core surface with an inner core differential rotation or the temporal change of inner core surface alone sufficiently and consistently explains the seismic data. Accompanying the debate are another two important unresolved issues: what are the general characteristics and physical mechanisms of the inner core surface change? Here, we show that the data contradictions to the hypothesis of inner core differential rotation are extensive and temporal changes of the inner core surface provide a simple and consistent explanation for the seismic data without any inner core differential rotation. In a first detailed study of general characteristics of inner core surface change, we map the spatiotemporal evolution of the inner core surface beneath eastern South America between 2003 and 2024 using a repeating earthquake cluster. Seismic mapping reveals that inner core surface changes vary greatly with geographic locations and possess irregular episodes of change, quiescence and recovery. We propose two physical mechanisms for the inner core surface changes: localized viscous deformation induced by episodic small-scale forces and localized alternate solidification/melting. Our results indicate that, on a time scale of years to days and in a way of large geographical variations, the inner core plays a significant role in influencing small-scale driving forces of Earth's geodynamo and/or interacting with the small-scale forces near its surface.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 10","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JB034595","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072531","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}

{"title":"Acoustic Wave Signatures of Earthquake Rupture Dynamics in the Upper Atmosphere","authors":"Y. Kaneko,&nbsp;P. A. Inchin,&nbsp;Y. Nozuka,&nbsp;R. Sabatini,&nbsp;R. Enomoto,&nbsp;J. B. Snively","doi":"10.1029/2025JB033013","DOIUrl":"https://doi.org/10.1029/2025JB033013","url":null,"abstract":"<p>We perform three-dimensional coupled earthquake-atmosphere numerical simulations that integrate dynamic rupture, seismic wave propagation, and a compressible nonlinear atmospheric model to investigate how earthquake source parameters influence acoustic wave (AW) characteristics at 100–300 km altitude in the thermosphere. Specifically, we examine the effects of magnitude, fault type, and rupture speed by simulating a range of rupture scenarios, including sub- and supershear ruptures, normal and thrust faulting, heterogeneous ruptures, and tsunami earthquakes. Supershear ruptures generate AWs with earlier arrival times and distinctive signal shapes compared to subshear events. Normal-faulting earthquakes produce much weaker AW amplitudes due to rarefaction waves at the surface evolving into shock N-waves, contrasting with the stronger compressive AWs from thrust earthquakes. Fault heterogeneity strongly affects AWs in the lower atmosphere, but its influence diminishes in the upper atmosphere. Tsunami earthquakes yield AWs with similar periods but 20%–50% smaller amplitudes than thrust earthquakes of the same moment magnitude, offering a potential diagnostic feature. Our results show that the nonlinear evolution of AWs precludes straightforward comparison between surface and upper-atmosphere signals, making proper modeling of upper-atmospheric shock properties essential for reliable interpretation. We further corroborate that energy magnitude of an earthquake, rather than moment magnitude, primarily controls AW amplitude in the upper atmosphere. These findings underscore the diagnostic potential of upper-atmosphere observations, such as Global Navigation Satellite System signals, for constraining earthquake source characteristics, improving seismic monitoring, and advancing our understanding of earthquake-atmosphere interactions.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 9","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB033013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146655","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}

{"title":"Source Effects in Higher-Order Ambient Seismic Field Correlations","authors":"Sven Schippkus,&nbsp;Gregor Hillers,&nbsp;Céline Hadziioannou","doi":"10.1029/2025JB033615","DOIUrl":"https://doi.org/10.1029/2025JB033615","url":null,"abstract":"<p>Ambient seismic noise interferometry is widely used for surface wave imaging. It typically requires synchronous station recordings and assumes uniform noise source distributions. Higher-order correlations, such as the re-correlation of the reconstructed direct waves <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mfenced>\u0000 <msub>\u0000 <mi>C</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation> $left({C}_{2}right)$</annotation>\u0000 </semantics></math>, enable imaging with asynchronous data and can improve an incomplete source distribution. We show with field data and simulations that <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>C</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${C}_{2}$</annotation>\u0000 </semantics></math> surface wavefields are, however, highly sensitive to the original source distribution and even amplify the effects associated with directional incidence. This can lead to systematic errors in the obtained velocity estimates and the downstream subsurface images. A range of auxiliary station distributions tested for the re-correlation process can not mitigate this bias but introduce additional wavefield distortions. We find that both local and far-field imaging approaches using higher-order <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>C</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${C}_{2}$</annotation>\u0000 </semantics></math> correlation wavefields are affected by significant and systematic velocity estimation errors. Our results show that the re-correlation of direct waves is not an all-purpose correlation wavefield enhancement technique, which highlights the need for a careful consideration of source effects for improved imaging.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 9","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB033615","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149048474","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}

{"title":"Resolving Sub-Kilometer Cascading Ruptures of Moderate Earthquakes With Distributed Acoustic Sensing","authors":"Hao Zhang,&nbsp;Zhongwen Zhan","doi":"10.1029/2026JB034841","DOIUrl":"https://doi.org/10.1029/2026JB034841","url":null,"abstract":"<p>A comprehensive understanding of earthquake dynamics requires integrated observations of both low-frequency slip and high-frequency energy radiation. Although back-projection is a powerful technique for tracking these high-frequency signals, its application to moderate earthquakes remains constrained by the sparse station density of conventional seismic networks. Distributed Acoustic Sensing (DAS) offers a promising complement by providing dense and continuous measurements along existing fiber-optic cables. In this study, we systematically evaluate the resolution capabilities of DAS networks for back-projection through synthetic tests and the analysis of an <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mi>W</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${M}_{W}$</annotation>\u0000 </semantics></math> 4.9 earthquake in the Eastern California Shear Zone. We demonstrate that the dense spatial sampling of DAS enables the identification of fine-scale rupture features. Furthermore, we propose a two-step inversion procedure that integrates DAS observations with regional broadband station data. Our results suggest that DAS arrays can significantly enhance the spatiotemporal resolution of earthquake observation systems and improve our understanding of rupture dynamics and seismic risk.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"131 9","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146752","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}