Journal of Applied Geophysics最新文献

{"title":"Applicability of Growth inversion in microgravimetry for archeological prospection and sinkhole hazard detection: Jur, Koš and Senec case studies","authors":"Jozef Bódi ,&nbsp;Peter Vajda ,&nbsp;Roman Pašteka ,&nbsp;Jaroslava Pánisová ,&nbsp;Juraj Papčo ,&nbsp;Pavol Zahorec ,&nbsp;José Fernández","doi":"10.1016/j.jappgeo.2025.105718","DOIUrl":"10.1016/j.jappgeo.2025.105718","url":null,"abstract":"<div><div>The applicability and benefits of the Growth inversion methodology in near-surface geophysics, specifically microgravimetry, is demonstrated here by three case studies from the realm of archeological prospection and sinkhole hazard detection. We use the GROWTH-23 package to arrive at heterogenous source body models and GROWTH-dg to produce homogenous models. We took existing gravity data, namely local gravity anomalies or residual complete Bouguer anomalies, from three case studies and inverted them using the Growth approach. We analyzed the choice of proper values of the individual adjustable Growth inversion parameters for the individual near-surface Growth solutions. The obtained best-recovery Growth models were compared with and validated against the existing interpretations of the same microgravimetric data sets. Lessons were learned from these comparisons regarding the settings of the individual adjustable Growth parameters. The first case study is from the field of archeological prospection and regards the microgravimetric detection of medieval tombs, crypts, and buried foundations in a church. The second case study deals with detection of surface collapse and sinkhole hazard associated with shallow underground mining. The third case study targets sinkhole hazard in an urban area stemming from unknown cavities such as cellars. All in all, the application of the Growth inversion in these cases proved successful and has demonstrated its benefits.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"238 ","pages":"Article 105718"},"PeriodicalIF":2.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769060","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":"Investigating nonlinear resistivity characteristics and mechanisms of coal during various loading stages","authors":"Liming Qiu ,&nbsp;Jintao Dang ,&nbsp;Jianguo Zhang ,&nbsp;Man Wang ,&nbsp;Qiang Liu ,&nbsp;Leilei Si ,&nbsp;Ziyi Jiang ,&nbsp;Majid Khan","doi":"10.1016/j.jappgeo.2025.105705","DOIUrl":"10.1016/j.jappgeo.2025.105705","url":null,"abstract":"<div><div>Accurately revealing the resistivity response patterns during coal fracture caused by loading and failure process of coal is fundamental to the application of DC resistivity methods in detecting coal dynamic disasters. This work delves into the intricate variability patterns of electrical resistivity exhibited by coal across diverse loading phases, and finds that there is fluctuation in electrical resistivity during the coal failure process, rather than the linear function relationship obtained in previous studies. The fluctuation in resistivity during the coal fracture process arises from the closure of existing fractures and the generation of new fractures. The former decreases resistivity, while the latter increases it, and their combined effect causes resistivity to fluctuate. Through long-range correlation analysis, it was found that the electrical resistivity of coal exhibits significant self similarity during the loading and fracturing process, with a Hurst exponent <em>H</em> higher than 0.98. The resistivity during coal fracture process exhibits fractal characteristics, with fractal box dimensions of 1.328 and 1.450 for the resistivity of the two samples, respectively. The fluctuation of resistivity during the loading process of coal is closely related to the compression process and development of fractures. In the four stages of coal sample loading, fractures evolve from initial formation, expansion to complete fracturing, with the fractal box-counting dimension exhibiting a trend of increase-increase-decrease. These research findings provide new insights into using resistivity inversion for coal fracture detection, which is of significant importance for the development of resistivity technology.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"238 ","pages":"Article 105705"},"PeriodicalIF":2.2,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738228","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":"Leakage channel detection in dams based on integrated geophysical methods","authors":"Kuiye Wei ,&nbsp;Hongbing Zhang ,&nbsp;Xiang Zhao ,&nbsp;Shibin Zhu ,&nbsp;Zuoping Shang ,&nbsp;Yandong Liu","doi":"10.1016/j.jappgeo.2025.105703","DOIUrl":"10.1016/j.jappgeo.2025.105703","url":null,"abstract":"<div><div>Dam leakage is a critical issue in reservoir operation, as it affects the reservoir's water storage function and the safety and stability of the dam. This paper proposes an integrated geophysical method that combines high-resolution shallow water seismic, ground penetrating radar (GPR), and pseudo-random flow field (PRFF) techniques to detect leakage channels in concrete dams. The seismic method is utilized to identify the distribution of the underwater medium in the reservoir area and the fault structure. The GPR method is employed to detect water-rich areas in the dam and assess the integrity of the impermeable wall. Additionally, the PRFF method is employed to locate leakage entrances in the base of the dam and the dam body. The analysis indicates that the leakage location in the dam base in this case is between 320 and 340 m, primarily associated with F1. The specific point of leakage in the dam body is at 341 m with an elevation of 51.0 m, mainly attributed to the failure of the water stop facilities. The potential leakage zone is approximately located around 243 m. The integrated geophysical approach enables the identification of dam base leakage, dam body leakage, and potential leakage zone, while also providing insights into the causes of leakage. Consequently, it can serve as a basis for effectively addressing dam leakage issues.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105703"},"PeriodicalIF":2.2,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714332","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 study on the characteristics of guided waves in shallow marine environment","authors":"Lingli Gao ,&nbsp;Yudi Pan ,&nbsp;Weijian Mao","doi":"10.1016/j.jappgeo.2025.105704","DOIUrl":"10.1016/j.jappgeo.2025.105704","url":null,"abstract":"<div><div>The determination of shallow S-wave velocity in marine surveys relies predominantly on the dispersion inversion of Scholte waves, analogous to Rayleigh wave applications in land situations. To determine shallow P-wave velocities, the dispersion nature of guided waves can be utilized. While theoretical frameworks for dispersion curve computation have been established, wavefield analysis about guided waves remains underdeveloped. This study employs finite-difference modelling to systematically investigate guided wave propagation characteristics and multimodal dispersion patterns across diverse shallow marine stratigraphic configurations. The simulation results reveal that the guided-wave dispersion images have to face high ambiguity in defining mode types and numbers. As a result, this ambiguity leads to an underestimation of P-wave velocity and errors in depth. Furthermore, the relative change in dispersion spectra in response to variations of the different parameters also provides evidence that guided waves formed in marine situations are more complex, particularly related to the velocity contrast ratio between the minimum S-wave velocity and the P-wave velocity in water. Guided waves are sensitive to both the variation of the S- and P-wave velocity except for a soft model in which guided waves are formed by purely P-related waves. Correct mode identification and reasonable initial model building are key steps to ensure the inversion accuracy. The mode misidentification and low sensitivity of picked phase velocities to the inverted parameter significantly increase the inversion uncertainty, thereby reducing confidence in the final results. It reminds us to pay extra attention to this phenomenon when prior underground information is available.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105704"},"PeriodicalIF":2.2,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714333","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":"Porosity estimation using machine learning approaches for shale reservoirs: A case study of the Lianggaoshan Formation, Sichuan Basin, Western China","authors":"Roufeida Bennani ,&nbsp;Min Wang ,&nbsp;Xin Wang ,&nbsp;Tianyi Li","doi":"10.1016/j.jappgeo.2025.105702","DOIUrl":"10.1016/j.jappgeo.2025.105702","url":null,"abstract":"<div><div>Shale porosity is a key petrophysical property that controls the production of hydrocarbons in shale reserves. Accurate determination of this parameter in such formations is challenging due to the complex pore structures, diverse mineral compositions, and high organic content, which complicate the establishment of a physical relationship between reservoir properties and logging data. This study addresses these challenges by developing machine learning models to estimate shale porosity logs using core and well-logging data. Three supervised machine learning algorithms were employed: support vector regressor, multilayer perceptron, and random forest with different ranges of data proportions. These models were evaluated using the correlation coefficient and root mean square error (RMSE) scores for both training and testing datasets. Among these, the random forest model demonstrated its effectiveness by combining predictions from multiple decision trees and handling nonlinear relationships within the input data. It required minimal preprocessing and parameter tuning, enabling accurate shale porosity predictions, with a high data correlation of 93.8 % and a low RMSE of 0.206. These results confirmed the model's suitability for managing limited and complex datasets. In contrast, the multilayer perceptron and support vector regressor were more sensitive to hyperparameter configurations and prone to overfitting. These limitations resulted in reduced accuracy and weaker correlation values compared to the random forest model.</div><div>In addition, a randomization process was introduced during the training phase with an accurate data proportion, to assess the model's reliability and minimize overfitting. The results indicated that this process had no significant impact on data performance, confirming its effectiveness in ensuring data accuracy.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105702"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683833","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":"Characterization of diabase core anisotropy: Integrating ultrasonic measurements and digital rock physics","authors":"Muhamad Ragil Setiawan ,&nbsp;Fatkhan ,&nbsp;Fourier Dzar Eljabbar Latief ,&nbsp;Umar Fauzi","doi":"10.1016/j.jappgeo.2025.105698","DOIUrl":"10.1016/j.jappgeo.2025.105698","url":null,"abstract":"<div><div>As intricate compositions of diverse materials, hard rock possesses complex mechanical and elastic properties influenced by various factors. In this study, a diabase core was drilled, characterized, measured, and analyzed to investigate the elastic properties of rocks. The research aims to evaluate these properties using dynamic and static methods, employing ultrasonic measurements and digital rock physics. The sample underwent mineralogical analysis through thin sections. Comparatively, micro-CT scanning was employed to explore potential layering and fractures that might impact the anisotropy of acoustic wave propagation, as observed in digital images. The digital image reveals the presence of high-density minerals, particularly Clinopyroxene, extending along the <em>z</em>-axis. The static and dynamic elastic moduli suggest that the sample exhibits isotropic characteristics. However, variations in anisotropy coefficient values for <em>V</em>_<em>p</em> and <em>V</em>_<em>s</em> are noted, likely stemming from high-density sheet-like minerals. While both static and dynamic methods produce elastic moduli and velocities within the typical range for diabase rock, notable differences are apparent, possibly due to disparities in the physical techniques utilized.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"238 ","pages":"Article 105698"},"PeriodicalIF":2.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828986","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 simulation of GPR via Leapfrog ADI-FDTD","authors":"Bohua Wang ,&nbsp;Hongyan Shen ,&nbsp;Han Che ,&nbsp;Shuai Liu ,&nbsp;Chi Wang ,&nbsp;Chengwei Zhang ,&nbsp;Hao Wang ,&nbsp;Shisheng Feng ,&nbsp;Kanglong Wang","doi":"10.1016/j.jappgeo.2025.105691","DOIUrl":"10.1016/j.jappgeo.2025.105691","url":null,"abstract":"<div><div>Numerical simulation of Ground-penetrating radar (GPR) is the basis for interpretating and inverting geological information from real GPR measured data. However, the current matured finite difference time domain (FDTD) numerical simulation technique has drawbacks such as strict time step limitation due to Courant Friedrich Lewy (CFL) condition and long computation time. As an improve method of FDTD, the alternating direction implicit FDTD (ADI-FDTD) numerical simulation technique, although stable and not limited by CFL condition, occupies a large amount of memory and has low computational efficiency. Therefore, we developed a GPR numerical simulation method based on the Leapfrog ADI-FDTD technique. The calculation results of this method are unconditionally stable, and its time step is not limited by CFL condition. In addition, in response to address the problem of slow numerical simulation speed cause by traditional sequential simulation, we also introduced Open multi-processing (OpenMP) technology to improve the serial simulation of sequential calculation into parallel simulation of multi-channel simultaneous computation in shared memory, further improving the computational efficiency of GPR numerical simulation. The numerical simulation results of homogeneous model, high contrast boundary model, three-layer geological model and slightly more complex geological model show that the proposed method effectively combines the advantages of Leapfrog ADI-FDTD and OpenMP parallel computing to achieve GPR numerical simulation quickly.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105691"},"PeriodicalIF":2.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683831","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":"Progressive damage process and destabilization precursor recognition of granite under high temperature based on acoustic emission","authors":"Kui Zhao ,&nbsp;Congming Li ,&nbsp;Peng Zeng ,&nbsp;Liangfeng Xiong ,&nbsp;Cong Gong ,&nbsp;Zhen Huang","doi":"10.1016/j.jappgeo.2025.105699","DOIUrl":"10.1016/j.jappgeo.2025.105699","url":null,"abstract":"<div><div>To investigate the crack evolution and failure precursory characteristics of granite after thermal damage, uniaxial compression acoustic emission (AE) experiments were conducted on granite specimens after various temperature. AE characteristics at different stress stages were analyzed. Characteristics of the AE multiparameter informativeness of post-high-temperature granites and differences in crack precursor information are discussed. The results showed that as the temperature increases, the uniaxial compressive strength and elastic modulus of granite decrease significantly, with reductions of 46.93 % and 73.20 %, respectively, at 800 °C compared to 25 °C. Conversely, the peak strain increased by over 135 % at 800 °C, indicating a transition from brittle to ductile behavior. The characteristic stress showing a significant reduction in their thresholds with increasing temperature. The distribution of AE events during the progressive damage process was significantly influenced by thermal damage. At 25–400 °C, the low, intermediate, and high frequency bands converted to each other, with low-frequency signals being dominant. At 600–800 °C, high-frequency signals prevailed before the peak stress, while low-frequency signals increased after the peak. The RA-AF distribution revealed that tensile cracks dominated in granite during the loading process, and the higher the degree of thermal damage, the more tensile crack is. The progressive damage process of granite shifted from a mixed fracture mode to a small-scale tensile fracture mode as the treatment temperature increased. Before peak stress, the proportion of small-scale shear cracks increased, while after peak stress, the proportion of large-scale tensile cracks became more prominent. The AE entropy curve can well reflect the progressive damage characteristics of granite at different temperature. Entropy rapid increase is the precursor characteristics of granite instability. The dominant frequency entropy precursor response appears the earliest, and the amplitude entropy precursor response is the latest. The precursor response occurred earlier with increasing temperature, providing a reliable warning signal for rock failure.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105699"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644189","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":"Application of gravity gradient measurement in the detection of urban underground space","authors":"Zhong-kun Qiao ,&nbsp;Jia-jun Zhang ,&nbsp;Peng Yuan ,&nbsp;Lin-ling Li ,&nbsp;Ruo Hu ,&nbsp;Hai-xiang Yang ,&nbsp;Kan-xing Weng ,&nbsp;Zong-yu Zhang ,&nbsp;Lin-fei Wang ,&nbsp;Pei Qin ,&nbsp;Liang-liang Hao ,&nbsp;Chuan Yang ,&nbsp;Xiao-feng Lv ,&nbsp;Xue-min Wu ,&nbsp;Bin Wu ,&nbsp;Xiao-long Wang ,&nbsp;Qiang Lin","doi":"10.1016/j.jappgeo.2025.105700","DOIUrl":"10.1016/j.jappgeo.2025.105700","url":null,"abstract":"<div><div>With the continuous progress of urbanization, the safe development and utilization of urban underground space becomes increasingly important. Microgravity measurement technology (including gravity and gravity gradient) has gained widespread use in urban underground space exploration, such as urban ground crack detection and underground cavity detection, due to its advantages of high efficiency, low cost, and broad application. This study describes the composition and working principle of the self-developed quantum gravity gradiometer of Zhejiang University of Technology and analyzes the gravity and gravity gradient anomaly characteristics of subsurface anomalies at different depths through model simulations. The results show that gravity gradient anomalies are more effectively identified than gravity anomalies within a certain depth range at shallow depths. Additionally, this study analyzes the recognition capabilities for anomaly radius, burial depth, and surrounding rock density differences when the gravity gradient accuracy is 1E, providing valuable reference and guidance for practical applications for quantum gravity gradiometer in urban underground space detection. Finally, field measurement data are used to validate the effectiveness, advantages, and challenges of gravity gradient measurement technology in urban underground space detection. This results indicate that gravity gradient measurement technology holds significant potential for urban underground space detection, offering more accurate and reliable data to support the development and utilization of urban underground spaces.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105700"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683834","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":"Influence of different cooling methods in thermal treatment on uniaxial compressive strength and elastic modulus of granite","authors":"Linfei Wang ,&nbsp;Jun Peng ,&nbsp;Chuanhua Xu ,&nbsp;Bibo Dai ,&nbsp;Zixin Wang","doi":"10.1016/j.jappgeo.2025.105701","DOIUrl":"10.1016/j.jappgeo.2025.105701","url":null,"abstract":"<div><div>Cooling in thermal treatment has a large influence on mechanical behavior of granite. Results from previous laboratory tests show that the variation of mechanical parameter is different for granite specimens treated by different cooling methods. However, the underlying mechanism of how different cooling methods affect the mechanical behavior of granite is not completely understood. In this study, a total of 20 sets of test data of granite treated by different cooling methods in thermal damage are first collected. The variations of mechanical parameters of granite with treatment temperature and thermal cycle are then studied, respectively. The variations of mechanical parameters in response to the change of treatment temperature and thermal cycle under different cooling treatments are classified into several types. At last, the mechanisms of cooling in thermal gradient treatment and thermal cyclic treatment are comprehensively discussed. The results in this study provide useful insight in better understanding the mechanism of how different cooling methods in thermal treatment affect the mechanical behavior of granite.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"237 ","pages":"Article 105701"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683835","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}