Journal of Applied Geophysics最新文献

{"title":"Passive and active seismics to identify geotechnical site characterization at industrial zone, Aswan, Egypt","authors":"Maha Abdelbaset ,&nbsp;Abdelnasser Mohamed ,&nbsp;Rashad Sawires ,&nbsp;Awad A.A. Omran ,&nbsp;Mostafa Thabet","doi":"10.1016/j.jappgeo.2025.105948","DOIUrl":"10.1016/j.jappgeo.2025.105948","url":null,"abstract":"<div><div>Integrating passive and active seismic approaches is essential to yield reliable geotechnical site characterization, particularly in forthcoming industrial and/or urbanized regions. The primary objective of this study is to deliver reliable geotechnical site characterizations and address uncertainty-related repeatability of different techniques to derive <em>S</em>-wave velocity structures (<span><math><msub><mi>V</mi><mi>S</mi></msub></math></span>). We employed three comprehensive field survey measurements, including 10 shallow <em>P</em>-wave refraction tomography profiles, 10 multi-channel analyses of surface waves (MASW) profiles, and 20 horizontal-to-vertical spectral ratios of microtremor (MHVSR) measurements. These measurements were carried out on the forthcoming industrial zone in Aswan, Egypt. We newly introduced a straightforward approach based on the allowable bearing capacity (<span><math><msub><mi>q</mi><mi>a</mi></msub></math></span>) and the local geological information to examine the resulting uncertainty.</div><div>Thus, we addressed the repeatability of different techniques to derive the <span><math><msub><mi>V</mi><mi>S</mi></msub></math></span> using MASW and MHVSR. The <span><math><msub><mi>q</mi><mi>a</mi></msub></math></span> based on MHVSR-derived <span><math><msub><mi>V</mi><mi>S</mi></msub></math></span> considered as the safest lower boundary. Consequently, the criticism of MASW and MHVSR inversion uncertainty is addressed for the future-planned low-rise buildings in the forthcoming industrial zone in Aswan, Egypt. The derived seismic vulnerability index (<span><math><msub><mi>K</mi><mi>g</mi></msub></math></span>) exhibits very high, high, and low categories. The NS and EW directional MHVSRs are transverse to the EW and NS main strikes of the seismogenic active fault system, respectively. There is a remarkable correlation between <span><math><msub><mi>K</mi><mi>g</mi></msub></math></span> and the time-averaged <em>S</em>-wave velocity of the upper 30 m (<span><math><msub><mi>V</mi><mrow><mi>S</mi><mn>30</mn></mrow></msub></math></span>) derived from MHVSR. Finally, we found that high densities, empirically calculated based on <em>P</em>-wave velocity, correlate well with the high-gravity anomalies observed in the southern portion of the study area.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105948"},"PeriodicalIF":2.1,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the influence of different cooling methods on the pore structure of gneiss using MCT-threshold segmentation method","authors":"Baofu Kou ,&nbsp;Xiao Yang ,&nbsp;Zhijiang Zhang ,&nbsp;Zhenshun Li","doi":"10.1016/j.jappgeo.2025.105947","DOIUrl":"10.1016/j.jappgeo.2025.105947","url":null,"abstract":"<div><div>Investigating the damage mechanism of rock micro structure after various heating-cooling treatments is crucial for evaluating the stability of an enhanced geothermal system. However, studies on the macro parameters of gneiss in cyclic heating-water cooling are scarce. This study designs a cyclic heating-water cooling test (25–700 °C). It determines the micro pore structure and related parameters (connected pores, porosity, and others) of the post-gneiss using micro-computer tomography (MCT), X-ray diffraction (XRD), and thin section petrographic analysis. In addition, a comparative test of cyclic heating-natural cooling is conducted to obtain the weakening mechanism of the pore structure of gneiss under cyclic heating-water cooling conditions. The findings indicated that the microstructure of gneisses subjected to the two cooling techniques exhibits similar evolutionary characteristics. When the temperature is between 300 and 500 °C, the parameters of gneisses will decrease slightly under natural cooling and increase slightly under water cooling. Due to rapid cooling, more microcracks and thermal damage will form within gneisses under water cooling. Water-induced weakening promotes physicochemical reactions of the internal mineral composition of the rock mass, resulting in great microstructural deterioration of the gneiss under thermal stress.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105947"},"PeriodicalIF":2.1,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of seepage detection in landfills based on resistivity anomaly and MODFLOW","authors":"Jingrui Xiao ,&nbsp;Yanli Ding ,&nbsp;Min Huang ,&nbsp;Bin Xiong ,&nbsp;Shaoyuan Bai","doi":"10.1016/j.jappgeo.2025.105946","DOIUrl":"10.1016/j.jappgeo.2025.105946","url":null,"abstract":"<div><div>Landfills, which are economical, practical, and have significant technological advantages, are widely used in solid waste treatment worldwide. However, almost all landfill impermeable layers have leakage problems, and if the leakage points are not detected and repaired timeously, garbage leachate will leak through the pores into the soil or ambient water, posing a potential risk to environmental health and safety. Therefore, the accurate detection of landfill leakage and real-time monitoring of pollution plumes is of great significance for landfill pollution control and restoration. In this study, in-situ resistivity detection was used at the bottom of a landfill site, and Visual MODFLOW was used to establish a solute transport model of the landfill site. The results show that the location of the leakage point can be accurately detected by comparing the resistivity difference before and after leakage. The groundwater model can be verified by converting the resistivity data into concentration data. The feasibility of in-situ resistivity detection was verified in reverse, and it can be used to monitor and predict the migration path of pollution plumes and provide some technical support for the treatment and repair of landfill leakage.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105946"},"PeriodicalIF":2.1,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical modelling of seismoelectric signals for offshore exploration","authors":"Federico Bucher ,&nbsp;Fabio I. Zyserman ,&nbsp;Leonardo B. Monachesi","doi":"10.1016/j.jappgeo.2025.105925","DOIUrl":"10.1016/j.jappgeo.2025.105925","url":null,"abstract":"<div><div>By means of a novel numerical procedure based on the finite element method, we study the seismoelectric responses generated in offshore scenarios of interest, such as hydrocarbon or gas hydrate reservoirs beneath the seafloor. Our proposal is capable of dealing with non-horizontal sea bottom geometries and arbitrary distributions of fluids and fluid-saturated porous media. Considering point sources in the water, we study various geological settings by modifying the geometries of the involved interfaces, the source central frequency and the pore-fluid and solid mechanical and electrical properties. Employing realistic acoustic source amplitudes, our results show that seismically-induced electromagnetic signals can be measured by receivers located in seawater with amplitudes detectable by the technologies currently available. Furthermore, our findings highlight that seismoeletric signals display a detectable sensitivity to hydrocarbon reservoirs and gas hydrates beneath the seafloor, also addressing the impact of different seabed topographies.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105925"},"PeriodicalIF":2.1,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dispersion-dissipation analysis of quadrilateral- and triangular-based discontinuous Galerkin methods for the visco-acoustic wave equation","authors":"Rubing Han ,&nbsp;Jiandong Huang ,&nbsp;Xijun He","doi":"10.1016/j.jappgeo.2025.105931","DOIUrl":"10.1016/j.jappgeo.2025.105931","url":null,"abstract":"<div><div>The discontinuous Galerkin method (DGM) has been extensively applied to numerically discretize acoustic and elastic wave equations. However, few studies are focused on viscous media. In this study, we conduct a comprehensive numerical dispersion-dissipation analysis of DGM for the visco-acoustic wave equation and simulate wave propagation in viscous media. The plane-wave analysis is based on the standard-linear-solid (SLS) -based model. A weighted Runge- Kutta (WRK) time scheme, Legendre polynomials, and a local Lax-Friedrichs flux are employed. The fully discrete analyses are implemented in quadrilateral and triangular elements. We consider two types of triangular elements, the quality factors and the number of mechanisms. Our results show that the quality factor leads to the numerical dispersion, the value of which is constant within a range of small sampling rate, but does not cause numerical dissipation. The visco-acoustic wave equation for different mechanisms for viscosity also introduces an inherent numerical-dispersion value that is not affected by the sampling rate. Meanwhile, we find that the stability of the quadrilateral mesh is stronger than that of the triangular mesh under the same order of basis functions. Several numerical experiments are provided to validate some theoretical findings. Seismic waves go through attenuation and phase distortion during propagation, and the numerical results indicate that the DGM is suitable for simulating seismic wave propagation in the SLS-based model.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105931"},"PeriodicalIF":2.1,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Permittivity measurements of artificial sediment with high conductivity using open-ended coaxial probe","authors":"Guangyu Yang ,&nbsp;Bin Wang ,&nbsp;Muzhi Gao ,&nbsp;Lanchang Xing ,&nbsp;Jiafa Zhang ,&nbsp;Qingji Jiang ,&nbsp;Xinmin Ge ,&nbsp;Zhoutuo Wei","doi":"10.1016/j.jappgeo.2025.105926","DOIUrl":"10.1016/j.jappgeo.2025.105926","url":null,"abstract":"<div><div>Microwave dielectric properties serve as critical diagnostic parameters in geophysical studies, enabling quantitative evaluation of factors such as water saturation and matrix structure. Open-ended coaxial probes (OCP) are widely used for broadband microwave dielectric measurements in highly mineralized loose geophysical sample like soil, sediments etc., where electrode polarization (EP) effects severely degrade measurement accuracy and obscure the Maxwell-Wagner (M-W) polarization near the lower frequency limit of OCP. Notably, the EP effect is highly sensitive to the electrode surface, and variations in the measurement process can significantly impact the accuracy of the EP correction model. To address these issues, this study proposes an optimized EP correction method based on the constant phase angle element (CPE) model. By calibrating with brine of the same conductivity as the sample after the initial measurement, consistency in electrode surface and conductivity conditions is ensured. This study establishes a transfer mechanism between the two scenarios, effectively removing EP's impact on complex permittivity measurements below several hundred MHz in highly mineralized sediment. Experimental results on artificial sediments revealed that M-W polarization strength increases with decreasing sand particle size, and with increasing brine mineralization and saturation. Additionally, clays with high cation exchange capacity enhance dispersion below 100 MHz and shift it to higher frequency. Further measurements on hydrate reservoir marine sediment confirm the method's effectiveness in complex natural samples. By eliminating the interference of EP, this study provides a reliable solution for accurate dielectric measurements in highly mineralized sediment, offering significant value for investigating seafloor sediments and soils.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105926"},"PeriodicalIF":2.1,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of offset on the depth and effectiveness of controlled-source audio-frequency magnetotellurics exploration","authors":"Dajun Li ,&nbsp;Yaoming Wang ,&nbsp;Yabin Li ,&nbsp;Aihua Weng ,&nbsp;Xuanlong Shan ,&nbsp;Chuncheng Li","doi":"10.1016/j.jappgeo.2025.105933","DOIUrl":"10.1016/j.jappgeo.2025.105933","url":null,"abstract":"<div><div>An appropriate offset is crucial for the successful application of controlled-source audio-frequency magnetotellurics (CSAMT) exploration. To investigate the effects of offset on the depth of investigation and application effectiveness of CSAMT exploration, inversion with 3D nonlinear conjugate gradient (NLCG) optimization is applied to synthetic and field datasets with various offsets. In the inversion, forward modeling using the staggered-grid finite difference method to discretize the secondary electric field equation is solved via the quasiminimal residual (QMR) method. The results demonstrate that as the offset increases, datasets show a progressive transition from the near-zone field to the middle- and far-zone fields, enabling more low-frequency data to acquire frequency sounding capabilities. The data from the far-zone field are significantly enriched in deep resistivity measurements. The optimal offset represents a trade-off between the maximal signal strength (effectiveness) and the objective depth of exploration. In light of these results, we synthesize and propose a structured five-step guideline for optimal offset selection, derived from established field-zone division principles and the skin-depth formula: (1) simple subsurface electrical structure construction, (2) target depth estimation, (3) frequency determination, (4) wavelength calculation, and (5) offset optimization. Field data from the Lushi Basin, China confirm that the offset affects not only the signal strength but also the reliability of the actual measured data. This study provides a reference for survey design in offset selection for CSAMT practitioners.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105933"},"PeriodicalIF":2.1,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial distribution and morphostructural control of Ediacaran Rodeio Velho volcanism, Camaquã Basin, southern Brazil","authors":"Gabriel Endrizzi ,&nbsp;Jairo Francisco Savian ,&nbsp;Carlos Augusto Sommer ,&nbsp;Maurício Barcelos Haag","doi":"10.1016/j.jappgeo.2025.105944","DOIUrl":"10.1016/j.jappgeo.2025.105944","url":null,"abstract":"<div><div>The Ediacaran Rodeio Velho volcanism represents the last magmatic event within the Dom Feliciano Belt in southern Brazil. Located at the base of the Guaritas Group (Camaquã Basin), this volcanism outcrops along NE-SW elongated trends parallel to major regional shear and fault zones of the Dom Feliciano Belt. For a long time, this volcanism has been described as a unique feature within the Guaritas Group. Here, we investigate the morpho-structural control of this basic volcanism distribution based on airborne magnetic and gamma-ray data, supported by terrestrial profiles. Our results indicate the presence of three Guaritas Magnetic Domains (GMD) individualized according to the Guaritas rift system: GMD-West, GMD-Central, and GMD-East. The Rodeio Velho volcanism is restricted to two of these domains (West and East), each located on distinct tectonic blocks, the São Gabriel and Tijucas Block, respectively. We identify that mapped volcanics are closely associated with magnetic anomalies represented by deep NW-SE faults, generally perpendicular to the major shear zones in the Dom Feliciano Belt. This indicates the significance of basement fracturing during the collisional to post-collisional period of the Dom Feliciano Belt (∼660–550 Ma). Based on geophysical data, our results indicate that magma emplacement occurred during the post-collisional transtensive phase, filling the rift compartments. This highlights the importance of tectonic stress reversal in the regions's geological history.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105944"},"PeriodicalIF":2.1,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic mechanical properties and energy analysis of argillaceous siltstone and quartzite under impact loading","authors":"Junxiang Wang,&nbsp;Ruibin Han,&nbsp;Song Tang,&nbsp;Gang Sun,&nbsp;Hao Wang","doi":"10.1016/j.jappgeo.2025.105934","DOIUrl":"10.1016/j.jappgeo.2025.105934","url":null,"abstract":"<div><div>To explore the dynamic mechanical properties and energy dissipation characteristics of different rock types under impact loading, critical for deep tunnel engineering, dynamic compression tests were performed on argillaceous siltstone and quartzite using a Split-Hopkinson Pressure Bar (SHPB) device, under various strain rates and stress conditions, along with finite element simulations in LS-DYNA, employing the RHT constitutive model, to delve deeper into the failure mechanisms of rocks under various stress states. Unlike prior studies, this research integrates true triaxial conditions to reflect complex in-situ stresses. The results show that as the strain rate increases, the peak strength of both rock types significantly increases, and the failure mode shifts from block failure to powder-like failure, with energy exhibiting an upward trend. The increase in incident and transmitted energy was more substantial than that in reflected and dissipated energy. At a strain rate exceeding 75 s⁻¹, under non-confined conditions, the incident energy of the two rock types increases by 94.90 % and 130.4 %, respectively, and the transmitted energy increases by 120.9 % and 130.2 %. Under confining pressure, the incident energy increases by 142.1 % and 109.5 %, while the transmitted energy increases by 154.9 % and 132.0 %. Under true triaxial conditions, the rocks exhibited shear failure as their failure mechanism. The argillaceous siltstone displayed crack propagation in a “V”-shaped pattern on the intermediate principal stress plane, while quartzite exhibited double-crack shear failure on the intermediate principal stress plane.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105934"},"PeriodicalIF":2.1,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on sandstone blasting damage and fracturing based on nuclear magnetic resonance and micro CT technology","authors":"Xianlei Zhu ,&nbsp;Huikang Peng ,&nbsp;Zhaoyang Wang ,&nbsp;Yanbing Wang","doi":"10.1016/j.jappgeo.2025.105935","DOIUrl":"10.1016/j.jappgeo.2025.105935","url":null,"abstract":"<div><div>There are many types of rocks and complex distribution of internal pores, which pose challenges for precise blasting of rock layers. Therefore, studying the spatial distribution of pores inside rocks and exploring the mechanisms of pore development and crack propagation under explosive loads is of great significance for fine blasting. This study takes red sandstone as an example and combines nuclear magnetic resonance (NMR) and computed tomography (CT) techniques to investigate the effect of porosity on sandstone fracture under explosive loading. Numerical simulation techniques are used to explore the mechanism of pore damage inside sandstone under explosive loading. The results showed that after the blasting, there was a significant “draw close” phenomenon between peak 1 and peak 2 in the <em>T</em>_<em>2</em> spectrum, and the signal intensity amplitude of peak 2 was much greater than that of peak 1. Sandstones with higher porosity typically have higher signal intensity amplitudes at peak 1 and peak 2, and exhibit more severe macroscopic fractures within the sandstone. After blasting, the number of pores in sandstone increases, and internal damage gradually shifts from microscopic rupture to macroscopic rupture. As the quality of explosives improves, the average and peak values of <em>T</em>₂ gradually increase, and the differences in average pore size and pore size become more pronounced. The distribution of pores gradually becomes uneven and irregular. Sandstones with higher porosity have faster propagation and attenuation rates of shock waves during blasting, larger pressure peaks, and more frequent propagation and alternation between pores and sandstone skeletons. This makes it easier for the initial pore throat structure to reach the bearing limit, promoting connectivity between sandstone pores.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"243 ","pages":"Article 105935"},"PeriodicalIF":2.1,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}