Journal of Geophysical Research: Solid Earth最新文献

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A Comparative Seismological Study of the Banning and Mission Creek Strands of the Southern San Andreas Fault 南圣安地列斯断层班宁和米逊溪带的比较地震学研究
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-29 DOI: 10.1029/2025JB031870
Shuye Huang, Haoran Meng, Yehuda Ben-Zion
{"title":"A Comparative Seismological Study of the Banning and Mission Creek Strands of the Southern San Andreas Fault","authors":"Shuye Huang,&nbsp;Haoran Meng,&nbsp;Yehuda Ben-Zion","doi":"10.1029/2025JB031870","DOIUrl":"10.1029/2025JB031870","url":null,"abstract":"<p>We perform comparative analyses of seismic signals and fault-zone structures at the Banning Fault (BF) and Mission Creek Fault (MCF) strands of the Southern San Andreas Fault (SoSAF) in the Coachella Valley, California. The research utilizes data recorded by densely spaced linear and two-dimensional (2D) seismic arrays deployed across two faults. Continuous recordings are first segmented and classified into earthquakes, rail and road traffic events, and non-traffic noise using various detection algorithms. We then employ beamforming on traffic signals and noise to resolve apparent Rayleigh-wave velocities in the 5–10 Hz frequency band, imaging the upper <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>100 m of each fault damage zone. Exploiting the dual-2D array coverage, we further extend beamforming analyses to regional earthquakes to reconstruct body-wave propagation directions and quantify their azimuthal rotations induced by fault-zone structures at depths of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>0.5–4 km. Our results reveal strongly asymmetric shallow damage zones on both strands, with velocity reductions of about 14.6% on the BF and 35.6% on the MCF toward the northeast. At greater depths, both faults are bimaterial interfaces that separate bounding rocks with higher seismic velocities on the northeast side, in agreement with previous large-scale P-wave tomography. Integrated observations document a depth-dependent reversal in velocity contrast across these bimaterial faults, consistent with rupture dynamics that promote northwestward propagation along the SoSAF and enhanced shallow damage accumulation on the stiffer block. The MCF, in particular, exhibits a pronounced asymmetric damage zone and increased wavefield scattering, affirming its role as the principal strand of the SoSAF in this region.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914982","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
Estimation and Attribution of Horizontal Land Motion Measured by the Greenland GNSS Network 格陵兰GNSS网测量水平陆地运动的估计与归因
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-28 DOI: 10.1029/2024JB030847
D. Longfors Berg, S. Adhikari, J. Hassan, R. Steffen, H. Steffen, M. Willis, S. A. Khan
{"title":"Estimation and Attribution of Horizontal Land Motion Measured by the Greenland GNSS Network","authors":"D. Longfors Berg,&nbsp;S. Adhikari,&nbsp;J. Hassan,&nbsp;R. Steffen,&nbsp;H. Steffen,&nbsp;M. Willis,&nbsp;S. A. Khan","doi":"10.1029/2024JB030847","DOIUrl":"10.1029/2024JB030847","url":null,"abstract":"<p>Horizontal land motion, as observed by geodetic techniques such as Global Navigation Satellite Systems (GNSS), is generally dominated by tectonic plate movement. However, in regions that are currently or formerly glaciated, such as Greenland, the deformation of the solid Earth due to surface loading complicates the separation of tectonic and glacial signals. Greenland, in particular, exhibits continent-wide horizontal motion of about <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>23</mn>\u0000 <mspace></mspace>\u0000 <mtext>mm/year</mtext>\u0000 </mrow>\u0000 <annotation> $23,text{mm/year}$</annotation>\u0000 </semantics></math> toward the northwest direction, as recorded in the ITRF reference frame by the Greenland GNSS Network (GNET). Credible estimates of Greenland's plate motion are currently lacking, which hinders the ability to isolate other geophysical contributions. To address this, we first quantify the horizontal crustal velocity due to elastic deformation from present-day ice mass changes. We then derive a new plate motion model for the North American Plate using 2891 GNSS stations (including 55 from GNET) and estimate an improved Euler pole position. After removing the effects of both contemporary ice loss and plate motion, the residual horizontal velocity at each GNET site is attributed to Glacial Isostatic Adjustment (GIA) processes. This refined data set provides critical input for future three-dimensional GIA modeling, enabling more accurate reconstructions of the deglaciation history, as well as better constraints on the solid Earth structure and mantle viscosity beneath Greenland and North America.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030847","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144910274","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
Widespread Extent of Irrecoverable Aquifer Depletion Revealed by Country-Wide Analysis of Land Surface Subsidence Hazard in Iran 伊朗地表沉降危害全国分析揭示含水层不可恢复耗竭的广泛程度
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-27 DOI: 10.1029/2024JB030367
Jessica A. Payne, A. R. Watson, Y. Maghsoudi, S. K. Ebmeier, R. Rigby, M. Lazecký, M. Thomas, J. R. Elliott
{"title":"Widespread Extent of Irrecoverable Aquifer Depletion Revealed by Country-Wide Analysis of Land Surface Subsidence Hazard in Iran","authors":"Jessica A. Payne,&nbsp;A. R. Watson,&nbsp;Y. Maghsoudi,&nbsp;S. K. Ebmeier,&nbsp;R. Rigby,&nbsp;M. Lazecký,&nbsp;M. Thomas,&nbsp;J. R. Elliott","doi":"10.1029/2024JB030367","DOIUrl":"10.1029/2024JB030367","url":null,"abstract":"<p>Ongoing depletion of Iran's groundwater, driven by human extraction, has contributed to 106 incidences of basin-scale, land-surface subsidence covering 31,400 km<sup>2</sup> (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>&gt;</mo>\u0000 </mrow>\u0000 <annotation> ${ &gt;} $</annotation>\u0000 </semantics></math>10 mm/yr, 1.9%) of the country. We use Sentinel-1 Interferometric Synthetic Aperture Radar time series to map and analyze, for the first time, surface velocities within these subsiding regions in vertical and east-west directions. We find maximum subsidence rates in the vertical direction reach <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>340 mm/yr in Rafsanjan, with 77% of subsidence faster than 10 mm/yr correlating with agriculture. We assess the risk posed by differential subsidence to residential populations, estimating that <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>650,200 people in Iran are exposed to medium or higher subsidence induced risk caused by steep differential subsidence gradients. We further demonstrate the use of these vertical and east-west velocity gradients in aiding identification of structural and geological controls on subsidence patterns, some of which are not evident on existing fault maps. We use Independent Component Analysis nationwide to separate subsidence deformation sources and demonstrate that most of Iran's rapid subsidence, and thus aquifer compaction, is irreversible, with inelastic deformation contributing at minimum 60% of the observed deformation magnitude. This proportion of deformation which is irreversible varies within and between subsidence regions. During a recent, severe regional drought (2020–2023), we demonstrate the control of precipitation on the elastic, recoverable subsidence deformation magnitude, with the elastic to inelastic deformation ratio falling from 41% to 44% pre-drought to 31%–36%.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030367","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905402","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
3D Analytical Solution for Stress and Elastic Energy Around Geometrically Irregular Interlocked Surfaces: Applications to Natural Faulting 几何不规则互锁表面周围应力和弹性能的三维解析解:在自然断层中的应用
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-27 DOI: 10.1029/2025JB031913
Vladimir Lyakhovsky, Doron Morad, Amir Sagy
{"title":"3D Analytical Solution for Stress and Elastic Energy Around Geometrically Irregular Interlocked Surfaces: Applications to Natural Faulting","authors":"Vladimir Lyakhovsky,&nbsp;Doron Morad,&nbsp;Amir Sagy","doi":"10.1029/2025JB031913","DOIUrl":"10.1029/2025JB031913","url":null,"abstract":"<p>The heterogeneity of shear resistance associated with surface roughness along fractures plays a crucial role in out-of-fault stress distribution, slip dynamics, and the energy dissipation during failure. We present a new 3-D analytical solution for the static stress field and elastic energy distribution near rough faults. The inputs for our calculations are the far-field stresses, the surface geometry, and the frictional strength of the fault. We then apply failure criteria to evaluate the likelihood of failure in the vicinity of the fault. Our scale-independent solution effectively captures stress heterogeneity in various contexts of nonplanar faults and shows that surface topography variations perpendicular to the slip direction significantly influence both the orientations and magnitudes of local stress as well as the likelihood of failure. Consistent with the previous 2-D solution, stress components decay exponentially with distance from the fault surface, with the decay factor corresponding to the wavelength of surface undulations. Our findings indicate that fault geometry and far-field stress conditions, which establish zones with both low failure likelihood and high energy density, promote the occurrence of the largest slip events. The solution has applications in seismological and geoengineering hazard assessments, offering valuable insights into stress distribution, energy dynamics, and failure conditions along geometrically complex fault systems.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905366","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
Sound Velocity and Grüneisen Parameter in Shock-Melted Silica at Deep Earth Pressures 深土压力下冲击熔融二氧化硅的声速和颗粒<s:1> neisen参数
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-27 DOI: 10.1029/2025JB031366
I. K. Ocampo, J. M. Winey, T. S. Duffy
{"title":"Sound Velocity and Grüneisen Parameter in Shock-Melted Silica at Deep Earth Pressures","authors":"I. K. Ocampo,&nbsp;J. M. Winey,&nbsp;T. S. Duffy","doi":"10.1029/2025JB031366","DOIUrl":"10.1029/2025JB031366","url":null,"abstract":"<p>Silica is a primary component of rocky planet interiors and its melt properties are important for understanding planetary formation and differentiation, magma oceans, and the deep mantle. Although well understood in the solid state, the high-pressure behavior of liquid silica is poorly constrained at lower mantle pressures. Using laser interferometry to measure shock wave profiles, we report measured stress-density states and longitudinal sound speeds in shock-synthesized stishovite, from fused silica staring material, and across the solid-liquid phase boundary up to 154 GPa. Our results constrain completion of melt at 80 GPa and show that at pressures relevant to the deep mantles of Earth-sized, rocky planets, the Grüneisen parameter for liquid silica increases with compression. This finding is consistent with a continuous increase in Si-O coordination above six for liquid silica at core-mantle boundary relevant pressures and temperatures.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031366","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905453","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
2D Versus 3D Numerical Simulations of Mantle Plume and Lithosphere Interaction: Quantitative Comparison and Scaling Analysis 地幔柱和岩石圈相互作用的二维与三维数值模拟:定量比较和尺度分析
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-27 DOI: 10.1029/2025JB031510
Rui-Min Zhang, Zhong-Hai Li, Hui-Ying Fu, Wei Leng, Ya-Nan Shi, Jason P. Morgan
{"title":"2D Versus 3D Numerical Simulations of Mantle Plume and Lithosphere Interaction: Quantitative Comparison and Scaling Analysis","authors":"Rui-Min Zhang,&nbsp;Zhong-Hai Li,&nbsp;Hui-Ying Fu,&nbsp;Wei Leng,&nbsp;Ya-Nan Shi,&nbsp;Jason P. Morgan","doi":"10.1029/2025JB031510","DOIUrl":"10.1029/2025JB031510","url":null,"abstract":"<p>Mantle plumes are a key phenomenon in geodynamics, connecting the deep Earth interior with surficial tectonic plates. Numerical simulations are essential for studying plume dynamics and their interactions with overlying lithosphere. While 3D models could better capture the geometric features of plumes, 2D simulations offer superior computational efficiency in large-scale and high-resolution scenarios, particularly when rheologically complex geological processes are involved. Thus, both 2D and 3D models have been widely applied in previous numerical studies. However, due to geometric effects, they may yield different results for the same parameters; we need to know how to build the proper scaling relationship between 2D and 3D models. Here, we systematically compare the 2D versus 3D mantle plume in two different regimes. In the first regime with only a plume head, the 2D plume should have a smaller diameter (65%–100% of the 3D value) and lower temperature (reduced by 0–60 K relative to the 3D case) to best match 3D model result. In the second regime with a continuous plume tail, a much smaller diameter (30%–45%) but counter-intuitively higher temperature (increased by 20–100 K) are needed for the 2D model to best approximate 3D result. Further analytical studies indicate that such discrepancies are mainly controlled by the conservations of area (2D) versus volume (3D) of plume materials. These numerical and analytical results provide quantitative relationships between 2D and 3D plume models, which act as a theoretical reference for interpretation of previous models as well as guidance for future studies.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905502","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
Mantle Flow and Crustal Deformation Revealed by Seismic Anisotropy in the Subduction Zone Beneath Myanmar 缅甸俯冲带地震各向异性揭示的地幔流动和地壳变形
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-26 DOI: 10.1029/2025JB031255
Enbo Fan, Mingming Jiang, Yinshuang Ai, Stephen S. Gao, Kelly H. Liu, Yumei He, Yiming Bai, Guangbing Hou, Yuan Ling, Chit Thet Mon, Myo Thant, Kyaing Sein
{"title":"Mantle Flow and Crustal Deformation Revealed by Seismic Anisotropy in the Subduction Zone Beneath Myanmar","authors":"Enbo Fan,&nbsp;Mingming Jiang,&nbsp;Yinshuang Ai,&nbsp;Stephen S. Gao,&nbsp;Kelly H. Liu,&nbsp;Yumei He,&nbsp;Yiming Bai,&nbsp;Guangbing Hou,&nbsp;Yuan Ling,&nbsp;Chit Thet Mon,&nbsp;Myo Thant,&nbsp;Kyaing Sein","doi":"10.1029/2025JB031255","DOIUrl":"10.1029/2025JB031255","url":null,"abstract":"<p>The oblique convergence of the Indian and Eurasian plates drives significant deformation in the crust and mantle beneath Myanmar. However, the crustal deformation in the Indo-Burman Ranges (IBR) and mantle flow beneath Myanmar and adjacent areas remain unclear due to limited studies. We utilized data from the newly deployed second phase of the China-Myanmar Geophysical Survey of the Myanmar Orogen array to perform shear wave splitting analysis of PKS, SKKS, and SKS (XKS) phases. Our results, together with previous findings, provide new insights into mantle flow and crustal deformation across central Myanmar. In the IBR, we observed a transition from N-S oriented, structure-induced crustal anisotropy north of 21°N to trench-perpendicular, stress-induced crustal anisotropy in the south. Such a transition contributes to a significant southward decrease in XKS splitting times in the IBR, where the XKS fast orientations predominantly align in a trench-parallel direction. In the West Burma Terrane, the trench-parallel fast orientations gradually transition to nearly trench-perpendicular toward the Sibumasu Terrane (ST), along with the estimated depths of anisotropy, reflecting a change in the primary source of anisotropy from trench-parallel sub-slab flow to mantle wedge flow. The transitional fast orientations in the ST are influenced by three factors: corner flow induced by active subduction, absolute plate motion-driven flow, and the remnant Neo-Tethyan slab, which remains permeable to mantle flow at depths of 50–125 km. Our research advances the understanding of crust-mantle deformation in the subduction zone beneath Myanmar and provides valuable constraints for subduction dynamics studies in the region.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 8","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897542","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
Rupture Propagation Direction at the Junction of the Garlock and San Andreas Fault System: A Machine Learning Classification Approach Driven by Earthquake Simulations Garlock和San Andreas断层系统交界处的破裂传播方向:一种基于地震模拟的机器学习分类方法
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-25 DOI: 10.1029/2024JB030278
Shankho Niyogi, Abhijit Ghosh, Evan Marschall, Roby Douilly, David Oglesby
{"title":"Rupture Propagation Direction at the Junction of the Garlock and San Andreas Fault System: A Machine Learning Classification Approach Driven by Earthquake Simulations","authors":"Shankho Niyogi,&nbsp;Abhijit Ghosh,&nbsp;Evan Marschall,&nbsp;Roby Douilly,&nbsp;David Oglesby","doi":"10.1029/2024JB030278","DOIUrl":"10.1029/2024JB030278","url":null,"abstract":"<p>Anticipating potential earthquake rupture paths in the San Andreas fault system poses considerable challenges due to its complex geometry, stress conditions, and frictional properties. A commonly used approach relies on independently varying parameters through iterations of earthquake simulations to better understand the effects of such parameters on rupture. However, such approaches are computationally expensive. In this study we implement a machine learning algorithm trained on outputs from the Rate-and-State earthquake simulator (RSQSim) to understand the importance of various parameters on the rupture path at the branch intersection of San Andreas and Garlock fault. We show how machine learning models employing gradient boosting (xgboost) and Random Forest trained on a data set of ∼9,800 simulated earthquakes can capture the rupture classification as well as extract feature importance of fault parameters. We demonstrate that for certain scenarios the machine learning models have considerable testing accuracy in classifying the rupture path, and augmentation of features in the input training data leads to improvements in the accuracy both in terms of precision and recall. Furthermore, our machine learning models suggest that the pre-earthquake conditions of the fault on which the rupture nucleated are the dominant parameters which affect rupture path at the branch intersection. This approach stands as a promising tool for rupture propagation and fault parameter studies, particularly for understanding which parameters are crucial for determining branching behavior. Consequently, it can help interpret the behavior of both modeled and real world faults.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 8","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144894269","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
Different Seismogenic Environments of Interplate and Intraslab Earthquakes: Re-Examination of Apparent Repeating Earthquakes 板间和岩内地震的不同发震环境:对重复地震的再考察
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-23 DOI: 10.1029/2025JB031433
Keisuke Yoshida
{"title":"Different Seismogenic Environments of Interplate and Intraslab Earthquakes: Re-Examination of Apparent Repeating Earthquakes","authors":"Keisuke Yoshida","doi":"10.1029/2025JB031433","DOIUrl":"10.1029/2025JB031433","url":null,"abstract":"<p>Repeating earthquakes (REs), which intermittently rupture the same fault area, offer unique constraints on aseismic slip and stress accumulation processes. While REs are typically observed at plate boundaries, recent studies have suggested their potential occurrence within slabs, providing important constraints on intraslab processes; however, detection methods involve arbitrary thresholds whose physical meaning is ambiguous. Here, we systematically examined earthquake repetition in both interplate and intraslab environments using 3,557 <i>M</i> &gt; 2 earthquakes near the 2003 <i>M</i><sub>w</sub> 7.0 Miyagi-oki, Japan, intraslab earthquake. By relocating events and applying source-overlap criteria, we identified 400 RE pairs—all located on the plate boundary above the intraslab seismicity. No reliable REs were detected within the slab. Our analyses further indicate that earthquakes in this depth range (50–60 km) had shorter rupture durations than expected from a simple circular slip model with 3–10 MPa stress drops, suggesting higher stress drops and smaller fault sizes. These observations highlight the importance of careful RE identification in complex regimes. For comparable interevent distances and frequency bands, waveform correlations were lower for intraslab earthquakes, implying more diverse focal mechanisms and/or stronger seismic scattering. Interevent distance distributions also showed a marked contrast: interplate events formed concentrated clusters, whereas intraslab events were diffusely distributed. These differences suggest fundamental variations in seismogenic environments, including seismic patch isolation, aseismic slip contribution, and fault distribution. Such differences may, in turn, reflect distinctions in temperature, alteration, fault maturity, strain localization, and stress field, which together influence the dominance of either seismic or aseismic slip.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 8","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031433","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892493","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
Late Mesoproterozoic Rapid True Polar Wander Recorded in the Jingeryu Formation, North China Craton 华北克拉通晚中元古代靖尔峪组快速真极漂移
IF 4.1 2区 地球科学
Journal of Geophysical Research: Solid Earth Pub Date : 2025-08-22 DOI: 10.1029/2024JB030628
Hanqing Zhao, Shihong Zhang, Jikai Ding, Qiang Ren, Jianping Qu, Kunkun Yang, Haiyan Li, Tianshui Yang, Huaichun Wu
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