{"title":"Acoustic emission characteristics and fracture mechanism of granite under three-point bending test","authors":"Baoshun Liu","doi":"10.13168/agg.2023.0016","DOIUrl":"https://doi.org/10.13168/agg.2023.0016","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":"41 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138951533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Integrated analysis of geophysical methods for landslide characterization","authors":"Muhammad Taqiuddin Zakaria","doi":"10.13168/agg.2023.0015","DOIUrl":"https://doi.org/10.13168/agg.2023.0015","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":"18 10","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An improved DFVMD-LSTM hybrid time series model for predicting total solar irradiance","authors":"Hongkang Chen","doi":"10.13168/agg.2023.0013","DOIUrl":"https://doi.org/10.13168/agg.2023.0013","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":"105 7-8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134906853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Surface waves as a cost-effective tool for enhancing the interpretation of shallow refraction seismic data","authors":"Martin Mazanec","doi":"10.13168/agg.2023.0012","DOIUrl":"https://doi.org/10.13168/agg.2023.0012","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136344742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Monitoring terrestrial water storage changes and drought in Jiangxi Province using GRACE and GRACE Follow-on data","authors":"Changmin Huan","doi":"10.13168/agg.2023.0011","DOIUrl":"https://doi.org/10.13168/agg.2023.0011","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136061374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Could long glaciers have been extended in the Bohemian Forest? Geophysical insight from Groer Rachel region","authors":"Daniel Papez","doi":"10.13168/agg.2023.0010","DOIUrl":"https://doi.org/10.13168/agg.2023.0010","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45890479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Resilient modulus (Mr) is one of the crucial parameters, which is used for the design of a multi-layer pavement system. The Mr is defined as a ratio between deviatoric cyclic axial stress to the recoverable axial strain. In general, the Mr is measured through the cyclic triaxial compression test. Besides, other tests such as light weight deflectometer (LWD) and dynamic cone penetrometer (DCP) were also employed to calculate the Mr of subgrade soil. In this study, two types of soil in Vietnam were taken and used for determining the Mr in the laboratory. Two field tests (i.e LWD and DCP) were also implemented for comparison. The results of this study show that the Mr of soil was positively related to compaction degree and confining pressure regardless of soil type. However, the changes of the Mrs under different deviator stresses varied with the type of subgrade soil. The Mr increased with the greater deviator stress for the two types of soil. Furthermore, the field LWD testing method can be effectively utilized to determine the resilient moduli of soil samples tested under similar conditions with a high level of accuracy. Finally, it was found that the dynamic penetration index has a good relationship with the dynamic deformation modulus. This correlation may thus yield a satisfactory estimation with an appropriate coefficient of determination.
{"title":"Resilient modulus of soil using for subgrade of pavement: A case study in Vietnam","authors":"T. Pham","doi":"10.13168/agg.2023.0009","DOIUrl":"https://doi.org/10.13168/agg.2023.0009","url":null,"abstract":"Resilient modulus (Mr) is one of the crucial parameters, which is used for the design of a multi-layer pavement system. The Mr is defined as a ratio between deviatoric cyclic axial stress to the recoverable axial strain. In general, the Mr is measured through the cyclic triaxial compression test. Besides, other tests such as light weight deflectometer (LWD) and dynamic cone penetrometer (DCP) were also employed to calculate the Mr of subgrade soil. In this study, two types of soil in Vietnam were taken and used for determining the Mr in the laboratory. Two field tests (i.e LWD and DCP) were also implemented for comparison. The results of this study show that the Mr of soil was positively related to compaction degree and confining pressure regardless of soil type. However, the changes of the Mrs under different deviator stresses varied with the type of subgrade soil. The Mr increased with the greater deviator stress for the two types of soil. Furthermore, the field LWD testing method can be effectively utilized to determine the resilient moduli of soil samples tested under similar conditions with a high level of accuracy. Finally, it was found that the dynamic penetration index has a good relationship with the dynamic deformation modulus. This correlation may thus yield a satisfactory estimation with an appropriate coefficient of determination.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44528854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Delineating structure elements and depth of sources using an aeromagnetic data set in the Tarhona region, Nortwest Libya","authors":"Fouzie Trepil","doi":"10.13168/agg.2023.0008","DOIUrl":"https://doi.org/10.13168/agg.2023.0008","url":null,"abstract":"","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47743013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose a decorrelation filter (noise-reduction filter) constructed by using the full error covariance matrix information of the spherical harmonic solutions derived from the observations of the Gravity Recovery and Climate Experiment (GRACE) mission. To construct the noise-reduction filter, the filter factors are inversely proportional to the eigenvalues of the covariance matrix. Using the designed noise-reduction filter, we can significantly reduce the north-south stripes in monthly GRACE gravity field solutions. Our study shows that the noise-reduction filter can achieve higher signal-to-noise ratio as compared to other filtering methods under consideration, i.e., P 3 M 8 and P 4 M 6 as well as Gaussian smoothing. Using the noise-reduction filter, the estimated mass rates over the entire Antarctica, East Antarctica and West Antarctica (including the Antarctica Peninsula) are -107.38±41.06 Gt/yr, 36.42±14.40 Gt/yr and -147.45±16.78 Gt/yr respectively, consistent with the results from the P 3 M 8 filter and P 4 M 6 combined with Gaussian filter.
{"title":"A decorrelation filter based on the full error covariance of GRACE gravity field solutions","authors":"Xiaolei Ju","doi":"10.13168/agg.2023.0005","DOIUrl":"https://doi.org/10.13168/agg.2023.0005","url":null,"abstract":"We propose a decorrelation filter (noise-reduction filter) constructed by using the full error covariance matrix information of the spherical harmonic solutions derived from the observations of the Gravity Recovery and Climate Experiment (GRACE) mission. To construct the noise-reduction filter, the filter factors are inversely proportional to the eigenvalues of the covariance matrix. Using the designed noise-reduction filter, we can significantly reduce the north-south stripes in monthly GRACE gravity field solutions. Our study shows that the noise-reduction filter can achieve higher signal-to-noise ratio as compared to other filtering methods under consideration, i.e., P 3 M 8 and P 4 M 6 as well as Gaussian smoothing. Using the noise-reduction filter, the estimated mass rates over the entire Antarctica, East Antarctica and West Antarctica (including the Antarctica Peninsula) are -107.38±41.06 Gt/yr, 36.42±14.40 Gt/yr and -147.45±16.78 Gt/yr respectively, consistent with the results from the P 3 M 8 filter and P 4 M 6 combined with Gaussian filter.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43459935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Improper selection of modal decomposition numbers and penalty factors in Variational Modal Decomposition (VMD) can result in over-decomposition and under-decomposition issues, impacting the analysis of high-precision Global Navigation Satellite System (GNSS) time series for geodynamics and geophysics research purposes. This work shows a new WOA-VMD-SSA (WVS) denoising method combining Whale Optimization Algorithm (WOA) and the VMD together with the Singular Spectrum Analysis (SSA) method. Simulated data comprising a combination of Flicker noise plus White noise (FN+WN) and General Gauss-Markov plus White noise (GGM+WN) were utilized in our experiments. That the simulation results show that WVS root mean square error (RMSE) decreased by 0.88 to 0.91mm compared to Empirical Mode Decomposition (EMD), Ensemble Empirical Mode Decomposition (EEMD) and Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN). The signal-to- noise ratio (SNR) and correlation coefficient (CC) increased by 1.08 to 1.12 dB and 0.17 to 0.18, respectively. And the WVS method has the smallest difference from the true value. Finally, experimental analysis was conducted by using the vertical component of the GNSS time series from 100 GNSS sites located in the west coast of the USA. The real data results show that compared with EMD, EEMD and CEEMDAN methods, WVS can effectively reduce the uncertainty of station velocity and obtain more accurate velocity values, which is consistent with the conclusions of our simulations. Besides, the WVS algorithm can adaptively determine the optimal parameters for VMD decomposition, and it is also more efficient in time series noise removal.
{"title":"A new adaptive WVS based denoising method on GNSS vertical time series","authors":"Zheng Huang","doi":"10.13168/agg.2023.0007","DOIUrl":"https://doi.org/10.13168/agg.2023.0007","url":null,"abstract":"Improper selection of modal decomposition numbers and penalty factors in Variational Modal Decomposition (VMD) can result in over-decomposition and under-decomposition issues, impacting the analysis of high-precision Global Navigation Satellite System (GNSS) time series for geodynamics and geophysics research purposes. This work shows a new WOA-VMD-SSA (WVS) denoising method combining Whale Optimization Algorithm (WOA) and the VMD together with the Singular Spectrum Analysis (SSA) method. Simulated data comprising a combination of Flicker noise plus White noise (FN+WN) and General Gauss-Markov plus White noise (GGM+WN) were utilized in our experiments. That the simulation results show that WVS root mean square error (RMSE) decreased by 0.88 to 0.91mm compared to Empirical Mode Decomposition (EMD), Ensemble Empirical Mode Decomposition (EEMD) and Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN). The signal-to- noise ratio (SNR) and correlation coefficient (CC) increased by 1.08 to 1.12 dB and 0.17 to 0.18, respectively. And the WVS method has the smallest difference from the true value. Finally, experimental analysis was conducted by using the vertical component of the GNSS time series from 100 GNSS sites located in the west coast of the USA. The real data results show that compared with EMD, EEMD and CEEMDAN methods, WVS can effectively reduce the uncertainty of station velocity and obtain more accurate velocity values, which is consistent with the conclusions of our simulations. Besides, the WVS algorithm can adaptively determine the optimal parameters for VMD decomposition, and it is also more efficient in time series noise removal.","PeriodicalId":50899,"journal":{"name":"Acta Geodynamica et Geomaterialia","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46939953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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