Journal of Geophysical Research: Solid Earth最新文献

{"title":"Ultra-Low-Velocity Disordered CaCO3 May Explain Mid-Lithospheric Discontinuities","authors":"Peiyu Zhang,&nbsp;Lianjie Man,&nbsp;Liang Yuan,&nbsp;Xiang Wu,&nbsp;Junfeng Zhang","doi":"10.1029/2025JB031906","DOIUrl":"10.1029/2025JB031906","url":null,"abstract":"<p>Seismology reveals vertical heterogeneities in the thick cratonic lithospheric mantle (CLM), yet limited mineral elasticity data hinder our understanding of their origin, as well as continental structure and evolution. As a major carbon reservoir, the CLM stores carbon primarily as carbonates including CaCO₃. Using ab initio machine learning-accelerated molecular dynamics at time–length scales beyond standard simulations, we identify a new phase transition in orientationally disordered crystalline CaCO₃ under mid-lithospheric discontinuity (MLD) conditions (3–5 GPa, 1300–1500 K). This transition, strongly supported by recent in situ X-ray diffraction experiments (<i>ACS Earth Space Chem.</i> 2022, 6, 6, 1506–1513), induces significant elastic softening, reducing bulk and shear moduli by ∼15% and ∼45%, respectively, and producing exceptionally low shear-wave velocities (∼2.04 km/s). Seismic low-velocity anomalies and high electrical resistance at MLDs, which cannot be fully explained by hydrous minerals alone, may instead result from small amounts (2–10 vol%) of ultra-low-velocity CaCO₃.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145089916","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":"Subduction-Driven Reworking of Craton and Accretionary Orogen: Evidence From Integrated Geophysical Imaging in Western North China Craton","authors":"Xingtao Kuang,&nbsp;Xi Xu,&nbsp;Baodi Wang,&nbsp;M. Santosh,&nbsp;Andrew V. Zuza,&nbsp;Yanyun Sun,&nbsp;Daoqing Zhou,&nbsp;Xuanjie Zhang,&nbsp;Xuezhong Yu,&nbsp;Wan Zhang,&nbsp;Song Han,&nbsp;Longlong Li,&nbsp;Baobao Cao,&nbsp;Fangxin Ning,&nbsp;Zhaoliang Li,&nbsp;Mengchu Xiao","doi":"10.1029/2024JB029392","DOIUrl":"10.1029/2024JB029392","url":null,"abstract":"<p>Observations and interpreted mechanisms for the reworking of Precambrian cratons and accretionary orogens have significant relevance in understanding the history and evolution of continental lithosphere. Here we investigate the Precambrian basement and lithospheric architecture of the western North China craton (NCC) through the integration of multiple geophysical data sets, including density structure derived from 2D velocity-constrained gravity-focused inversion, along with newly-compiled aeromagnetic, magnetotelluric (MT) and shear-wave velocity data. We present five multi-geophysical sections illustrating the lithospheric structure along compiled MT profiles in western NCC. The mantle lithosphere of the central-western Alxa block and central–southern Ordos block is primarily characterized by high velocity, low-moderate density and high resistivity. This contrasts with the mantle lithosphere on or near the Inner Mongolia Suture Zone (IMSZ), where an apparent low resistivity zone with anomalous density marks the Paleoproterozoic suture between the Yinshan block and the Ordos block. Our results demonstrate the Alxa block's preservation of an Archean–Paleoproterozoic metamorphic basement, linking it as the westward extension of the Yinshan block and an integral part of the Precambrian NCC. We propose that the marked lithospheric geophysical anomalies of the IMSZ mainly resulted from subduction processes related to the Paleo-Asian and Paleo-Pacific oceans. Our findings suggest the Precambrian cratonic accretionary orogens are more vulnerable to modification than adjacent Archean nuclei during later tectonic events. Therefore, cratonic accretionary orogens may be important for processes of craton destruction, continental breakup and lithospheric healing.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB029392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084113","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":"Kinematics of the Western Makran Subduction Zone: Insights From InSAR Analysis of Interseismic Coupling","authors":"A. Sobouti,&nbsp;S. Samiei Esfahany,&nbsp;M. A. Sharifi,&nbsp;A. M. Abolghasem,&nbsp;A. Bahroudi,&nbsp;A. M. Friedrich","doi":"10.1029/2025JB031167","DOIUrl":"10.1029/2025JB031167","url":null,"abstract":"<p>Subduction zones are key in shaping seismic hazards, yet many remain poorly understood. The Western Makran Subduction Zone (WMSZ) is a good example of a challenging hazard assessment due to its low seismic activity and limited geodetic data. The motivation is to explore the feasibility of using recently available long InSAR time-series to estimate low-amplitude interseismic behavior of such challenging areas. Through a sensitivity analysis, we demonstrate that with proper atmospheric signal mitigation, Sentinel-1 time-series can isolate the interseismic deformation in WMSZ. Building on this, we develop an InSAR time-series method focused on reducing atmospheric errors. Using corrected data, we propose inverse modeling without inserting rigid smoothing constraints, improving model flexibility to capture localized variation in coupling distribution. Results reveal the presence of partial coupling down-dip, contrary to previous studies. Near the coast, coupling values range from weak to moderate (0.3–0.6), dropping to near zero at around 25 km depth, and increasing partially at 30 km depth. The location of the observed partial coupling coincides with previous moderate seismic activities and the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mrow>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mi>w</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${M}_{w}$</annotation>\u0000 </semantics></math> 5.1, 5 March 2024 (Fanuj) earthquake. Comparison with GPS measurements shows similar deformation rates, validating the obtained results. The results indicate the possibility of partial coupling in intermediate depths under the southern Jazmourian plain, increasing the potential of moderate seismic hazard in WMSZ. This experience demonstrates that InSAR's high spatial resolution, combined with advanced error mitigation and slip modeling, can effectively capture small interseismic deformations even in subduction zones with low seismic activity.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084087","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":"Lithospheric Structure of the Dinarides-Adriatic Region From Ambient Noise Eikonal Tomography","authors":"Tena Belinić Topić,&nbsp;Petr Kolínský,&nbsp;Josip Stipčević","doi":"10.1029/2024JB030626","DOIUrl":"10.1029/2024JB030626","url":null,"abstract":"<p>The Dinarides, a mountain range along the eastern edge of the Adria microplate, is the focus of the ongoing extensive geophysical research due to its complex tectonic features and importance in the evolution of the central Mediterranean. There are numerous open questions about the interaction and movement of Adria in the last 20 Ma with regards to surrounding tectonic units connecting collision to subduction beneath the Dinarides and possible fragmentation of Adria along its central part. In this study, we apply ambient noise eikonal tomography to refine our understanding of the Dinaric crust and uppermost mantle. We use 7 years of continuous data from regional seismic stations to calculate surface-wave phase velocities. Eikonal tomography is applied to both Rayleigh and Love waves, with independent inversions of local dispersion curves for each wave type. This approach produces detailed maps of vertically and horizontally polarized shear-wave velocities at different depths. Our results reveal intriguing insights: a prominent high-velocity anomaly in the upper crust, likely linked to carbonate rock deposits, and a significant low-velocity anomaly in the mid-lower crust, suggesting the presence of the deep orogenic root. Additionally, the high-velocity anomaly in the upper mantle suggests an underthrusting of continental lithosphere. Combined with a thicker crust and a slightly shallower lower-velocity anomaly toward the Pannonian Basin—may indicate low angle subduction or lithospheric delamination. However, horizontally polarized shear waves expose a localized low-velocity anomaly beneath the NW Dinarides that is not observed by vertically polarized waves, highlighting the complexity of the region's crustal dynamics.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030626","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077246","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":"A Glimpse Into the Future of Tectonic Tremor Monitoring","authors":"David R. Shelly","doi":"10.1029/2025JB032642","DOIUrl":"10.1029/2025JB032642","url":null,"abstract":"<p>Tectonic tremor is a weak, long-duration seismic signal often observed in subduction zones and on some other plate-bounding faults. Because of tremor's characteristically low amplitude (and low signal-to-noise) and lack of clear phase arrivals, detecting and locating tremor usually requires techniques distinct from those applied to typical earthquakes. Major advances in detection and understanding of tremor have derived in the past from a powerful combination of new data and new analysis techniques. In a recent study, Sagae et al. (2025, https://doi.org/10.1029/2025jb031348) exploit that combination again, developing a new machine-learning based workflow and applying it to the S-net cabled seismic network in the Japan trench offshore northern Honshu. Their approach, although complex, succeeds in detecting several times more tremor activity than earlier studies, resulting in new insights and providing a blueprint for similar approaches that could be applied elsewhere. As real-time earthquake monitoring adopts similar tools, it may present an opportunity to bring tremor monitoring into operational workflows. In turn, this could solidify tremor monitoring as a component of future operational earthquake forecasting.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB032642","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077336","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":"Thermomechanical Analysis of the Louisville Seamount Chain: Implications for Late Cretaceous Pacific Plate Evolution","authors":"Gyuha Hwang,&nbsp;Seung-Sep Kim,&nbsp;Youngtak Ko","doi":"10.1029/2025JB031557","DOIUrl":"10.1029/2025JB031557","url":null,"abstract":"<p>We calculated elastic thickness (<i>T</i>_<i>e</i>), flexural deflection, and gravity anomalies of the oceanic lithosphere beneath 14 seamounts of the Louisville Seamount Chain to investigate seamount formation timing and tectonic settings. Using dense core modeling to approximate seamount mass, we compared <i>T</i>_<i>e</i> estimates with plate age at loading time. The northwestern seamounts (<i>T</i>_<i>e</i> = 6–8 km) formed over the Louisville hotspot earlier than age-dated volcanism, consistent with Osbourn Trough tectonic motion. The middle seamounts (<i>T</i>_<i>e</i> = 18–28 km) formed on lithosphere with consistent thermal age of 45 Myrs at loading time. The southeastern seamounts (<i>T</i>_<i>e</i> = 4–12 km) formed on lithosphere with similar thermal age, with elastic thickness reduced by additional thermal stress from juxtaposed younger lithosphere across fracture zones. This consistent loading age (∼45 Ma) across both middle and southeastern groups indicates limited Louisville hotspot motion during seamount formation. Based on our <i>T</i>_<i>e</i> estimates and thermal age patterns, we determined that the oceanic lithosphere beneath the middle section was produced by Late Cretaceous spreading centers between 105 and 84 Ma, providing new constraints on Pacific plate reconstructions during the Cretaceous Normal Superchron when traditional magnetic anomaly dating methods are limited.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031557","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077766","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":"Exploring the Effects of Hydraulic Fracturing on the 2019 Mw 5.0 Weiyuan Earthquake in Sichuan, China","authors":"Shuchao Tan,&nbsp;Lian Xue,&nbsp;Jinping Zi,&nbsp;Heng Luo,&nbsp;Hongfeng Yang,&nbsp;Li Zhao","doi":"10.1029/2025JB031284","DOIUrl":"10.1029/2025JB031284","url":null,"abstract":"<p>The seismicity inside the Sichuan Basin in southwest China has been dramatically intensified with the increase of shale gas exploitation recently. On 8 September 2019, an <i>M</i>_W 5.0 earthquake struck Weiyuan County in the Sichuan Basin, representing the largest earthquake in the Weiyuan shale gas field. It caused substantial damage and raised local awareness of the potential seismic risks induced by hydraulic fracturing (HF). Occurring 110 days after the shut-in of a HF site ∼1.25 km away, the seismogenic mechanisms of this event remain unclear. In this study, we use a 3D poroelastic coupled model to investigate how the HF potentially affected the <i>M</i>_W 5.0 mainshock. We find that events before the <i>M</i>_W 5.0 earthquake were mostly in the area where HF at platform Wei204H37 induced positive Coulomb failure stress change (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Δ</mi>\u0000 </mrow>\u0000 <annotation> ${Delta }$</annotation>\u0000 </semantics></math>CFS). The mainshock hypocenter was at the transition between the positive and negative <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Δ</mi>\u0000 </mrow>\u0000 <annotation> ${Delta }$</annotation>\u0000 </semantics></math>CFS. Considering the uncertainty of the hypocentral depth, the hypocenter could be in the positive <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Δ</mi>\u0000 </mrow>\u0000 <annotation> ${Delta }$</annotation>\u0000 </semantics></math>CFS zone when the hypocenter was shallow. Additionally, the main slip area of the <i>M</i>_W 5.0 earthquake constrained by InSAR observation lay within the positive <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Δ</mi>\u0000 </mrow>\u0000 <annotation> ${Delta }$</annotation>\u0000 </semantics></math>CFS region, suggesting that the rupture process may have been intensified by HF. Moreover, we find a foreshock sequence that could encourage the initiation of the mainshock, intensified by HF-induced positive <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Δ</mi>\u0000 </mrow>\u0000 <annotation> ${Delta }$</annotation>\u0000 </semantics></math>CFS and migrating toward the mainshock. This demonstrates that the region affected by static Coulomb stress transfer due to earthquake interactions exceeds the region affected by HF-induced positive <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Δ</mi>\u0000 </mrow>\u0000 <annotation> ${Delta }$</annotation>\u0000 </semantics></math>CFS.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031284","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077245","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":"SS Precursor Imaging Reveals a Global Oceanic Asthenosphere Modulated by Sea-Floor Spreading","authors":"Shuyang Sun,&nbsp;Ying Zhou","doi":"10.1029/2025JB032011","DOIUrl":"10.1029/2025JB032011","url":null,"abstract":"<p>The asthenosphere is a weak layer in the upper mantle where geotherm may exceed mantle solidus and partial melt occurs. Although it has been suggested that an increase in seismic wavespeed at about 220 km depth represents the base of the asthenosphere, seismic studies to-date have not been able to provide evidence for the existence of such a global interface in the oceanic regions. In this study, we report observations of SS precursors reflected at this boundary throughout the global oceans. The average depth of the discontinuity is approximately 250 km, with a velocity jump of about 7% across the interface. Finite-frequency tomography of SS precursor traveltimes reveals large depth variations of the discontinuity over short spatial distances, which explains the absence of this discontinuity in previous global stacks. The depth perturbations are characterized by alternating linear bands of shallow and deep anomalies that roughly follow seafloor age contours, indicating a fundamental connection between seafloor spreading and asthenosphere convection. The base of the asthenosphere is smoother under seafloors formed at slow-spreading centers and becomes much rougher under seafloors formed at fast-spreading centers with a spreading rate greater than <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mn>50</mn>\u0000 </mrow>\u0000 <annotation> ${sim} 50$</annotation>\u0000 </semantics></math> mm/yr. This observation suggests that different geophysical processes at slow and fast spreading centers generate lithospheric plates with different chemical compositions and physical properties, which in turn influences the convection in the oceanic asthenosphere.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB032011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077242","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":"Statistical Characteristics of Seismicity Correlated With Crustal Fluids in the Noto Region","authors":"Yicun Guo,&nbsp;Jiancang Zhuang,&nbsp;Guangyao Yin,&nbsp;Huai Zhang","doi":"10.1029/2025JB031544","DOIUrl":"10.1029/2025JB031544","url":null,"abstract":"<p>Earthquake swarms and strong shocks have frequently occurred in Noto Peninsula, Japan, for decades, resulting in a seismicity pattern characterized by a mixture of background earthquakes, swarms, and foreshock/aftershock sequences. Using an improved version of the space-time Epidemic-Type Aftershock Sequence model, we extract statistical features of the aftershocks hidden within earthquake sequences from 2000 to 2024. The aftershock productivity density patterns in the source regions of the 2007 Mw6.7, 2023 Mw6.2, and 2024 Mw7.5 earthquakes exhibit strong spatial heterogeneity, with high productivity density values extending from surface to depths of 15 km, 15 km, and 27 km, respectively. More importantly, the model parameters which characterize productivity and decay rates of aftershocks vary significantly in both space and time, as demonstrated by the results obtained from stochastic reconstruction. Two regions, located in the southwest and northeast of the Noto Peninsula, where the 2024 Mw7.5 mainshock has ruptured and earthquake swarms constantly occur, are characterized by higher <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>A</mi>\u0000 </mrow>\u0000 <annotation> $A$</annotation>\u0000 </semantics></math>, lower <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>α</mi>\u0000 </mrow>\u0000 <annotation> $alpha $</annotation>\u0000 </semantics></math>, relatively low <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>p</mi>\u0000 </mrow>\u0000 <annotation> $p$</annotation>\u0000 </semantics></math> and high <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>b</mi>\u0000 </mrow>\u0000 <annotation> $b$</annotation>\u0000 </semantics></math> values. Temporal variations in the parameters indicate that these anomalies are primarily observed between 2021 and 2023 in the swarm activated region. We attribute the statistical characteristics of seismicity in these two local regions—such as a larger proportion of indirectly triggered aftershocks, a slower decay rate of aftershock numbers, and a relative higher proportion of small events—to the presence and migration of fluids in the lower crust or upper mantle beneath the Noto Peninsula.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JB031544","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077244","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":"To Heal or Not to Heal?: 1. The Effect of Pore Fluid Pressure on the Frictional Healing Behavior of Lithologies in Oklahoma","authors":"Kristina K. Okamoto,&nbsp;Heather M. Savage,&nbsp;Nicholas M. Beeler,&nbsp;Brett M. Carpenter","doi":"10.1029/2024JB030573","DOIUrl":"10.1029/2024JB030573","url":null,"abstract":"<p>The competition between fault healing (i.e., re-strengthening) and fault loading determines the timing and magnitude of fault failure within the seismic cycle. Repeating earthquakes can give observational estimates of fault healing rates, however, it is difficult to link laboratory studies of frictional healing and observed healing rates from repeating earthquakes in part because of uncertainty in lithology at depth. Due to well-constrained and relatively simple geology, earthquakes in Oklahoma can be linked to the granitic basement rock and to the Arbuckle Group, which is primarily composed of dolomite at earthquake depths. Here, we conduct friction experiments to measure healing rates of the two earthquake-bearing lithologies at confining pressures representative of earthquake depths and pore pressures ranging from 0% to 80% of the confining pressure. We measure frictional healing by executing slide-hold-slide tests with hold times ranging from 3 s to 3000 s. The friction experiments on the Troy Granite indicate that pore fluid pressure does not greatly affect healing rate. On the other hand, the dolomite of the Arbuckle Group exhibits decreased healing with increased pore fluid pressure, with weakening at the highest pore pressure. We hypothesize that this is due to an increase in dissolution of dolomite at high pore pressures/low effective normal stress. These healing rates are used in the companion paper to understand the moment-recurrence time behavior of repeating earthquakes in Prague, Oklahoma. This work has implications for possible enhanced dissolution and weakening behavior of the Arbuckle Group during wastewater injection activities.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 9","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2024JB030573","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145071970","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}