Acta Geodaetica et Geophysica最新文献

Selection of a calibration system for relative gravimeters and testing of the processing using the example of the Zhetygen calibration baseline in Kazakhstan 选择相对重力仪的校准系统，并以哈萨克斯坦的热蒂根校准基线为例对处理过程进行测试

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-09-17 DOI: 10.1007/s40328-024-00454-x

Roman Sermiagin, Nurgan Kemerbayev, Khaini-Kamal Kassymkanova, Guzyaliya Mussina, Maral Shkiyeva, Nikolay Kosarev, Kanat Samarkhanov, Assel Batalova, Azamat Rakhimzhanov, Yeraly Kalen

{"title":"Selection of a calibration system for relative gravimeters and testing of the processing using the example of the Zhetygen calibration baseline in Kazakhstan","authors":"Roman Sermiagin, Nurgan Kemerbayev, Khaini-Kamal Kassymkanova, Guzyaliya Mussina, Maral Shkiyeva, Nikolay Kosarev, Kanat Samarkhanov, Assel Batalova, Azamat Rakhimzhanov, Yeraly Kalen","doi":"10.1007/s40328-024-00454-x","DOIUrl":"https://doi.org/10.1007/s40328-024-00454-x","url":null,"abstract":"This article consolidates and organizes modern methods for calibrating relative gravimeters, aiming to streamline the selection and implementation of effective calibration systems, particularly in Kazakhstan. The concept of the calibration function and various methods for its determination are presented. Practical implementations of laboratory methods relevant to modern high-precision relative gravimeters are discussed, including the tilt, moving mass, artificial acceleration, and line calibration methods. Data processing through least squares adjustment at the calibration line and an overview of existing software packages for gravity observation equalization are explored. The article also covers existing horizontal and vertical calibration systems in different countries, detailing their main characteristics and schematics. Finally, an estimation of scale factors for five years of measurements with Scintrex CG-5 gravimeters at the Zhetygen calibration line in Kazakhstan is provided.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258139","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}

引用次数: 0

A forwarding spoofing detection algorithm for Beidou navigation satellite system vulnerability 北斗卫星导航系统漏洞转发欺骗检测算法

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-09-16 DOI: 10.1007/s40328-024-00453-y

Jiangtao Xu, Yajuan Guo, Daohua Zhu, Yunxiao Sun, Wei Huang, Xindong Zhao

{"title":"A forwarding spoofing detection algorithm for Beidou navigation satellite system vulnerability","authors":"Jiangtao Xu, Yajuan Guo, Daohua Zhu, Yunxiao Sun, Wei Huang, Xindong Zhao","doi":"10.1007/s40328-024-00453-y","DOIUrl":"https://doi.org/10.1007/s40328-024-00453-y","url":null,"abstract":"With the Beidou navigation system's fast expansion in China, it is popular in military and civilian aspects. However, since the satellite orbit operates at an extremely high position and there is energy loss during the propagation process, the receiver only picks up a very faint signal, which makes the Beidou receiver very vulnerable to interference. The interference of the receiver is divided into natural interference and human interference, of which the human interference is particularly serious. Deception is commonly used in human interference. The deception interference detection technology in Beidou navigation system is studied in this research. Firstly, the signal in the signal capture stage is detected by multi-peak detection algorithm to determine the signal type. If it cannot be determined, the signal is detected by the half-peak full-width algorithm, so as to determine the signal type. In the stage of signal tracking, the Doppler shift of the spoofing signal is applied to determine whether the signal is spoofed or not. When the spoofing signal forwarding delay is set to 0.5 and 1 chip respectively, the full width of half peak is 8.56 and 11.35 after fitting the main peak. If the half-peak full width exceeds the normal navigation signal, it indicates spoofing interference. The constructed model can effectively track downspoofing signals and improve the Beidou navigation system’s detection performance.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258142","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}

引用次数: 0

Machine learning assisted model based petrographic classification: a case study from Bokaro coal field 基于岩石学分类的机器学习辅助模型：博卡洛煤田案例研究

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-09-13 DOI: 10.1007/s40328-024-00451-0

Abir Banerjee, Bappa Mukherjee, Kalachand Sain

{"title":"Machine learning assisted model based petrographic classification: a case study from Bokaro coal field","authors":"Abir Banerjee, Bappa Mukherjee, Kalachand Sain","doi":"10.1007/s40328-024-00451-0","DOIUrl":"https://doi.org/10.1007/s40328-024-00451-0","url":null,"abstract":"This study applies machine learning techniques to improve petrographic classification in India's Bokaro coalfield's Barakar Formation, using conventional geophysical well logs from three wells. We analysed natural gamma ray, true resistivity, bulk density, neutron porosity, and photoelectric factor data using k-nearest neighbor (kNN), support vector machine (SVM) and random forest (RF) classifiers. A master well provided initial reference log measurement cut-off values for typical lithologies like shale, sandstone, carbonaceous shale, and coal, forming the basis of our training dataset. We assessed model accuracy using precision, recall, and F1-score metrics, finding the random forest model to be the most effective in litho-type discrimination. During the training phase, the computed overall accuracy of the predicted ML modes exceeded 89% and model accuracy hierarchy was RF>SVM>kNN. These classifiers were then applied to other well locations to predict lithological sequences, aiding in lithofacies sequence identification and potential fault extension detection. The study demonstrates the random forest model's superior precision and efficiency in lithological discrimination. Our findings enhance automated processes for identifying missing lithology during well correlation, offering valuable insights for geological interpretation in resource exploration and development. This machine learning-driven approach marks a significant advancement in subsurface geological studies.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222795","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}

引用次数: 0

Spatial and temporal analysis of daily terrestrial water storage anomalies in China 中国陆地日蓄水异常的时空分析

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-08-31 DOI: 10.1007/s40328-024-00452-z

Weiwei Li, Kun Wang, Xiaonan Li

{"title":"Spatial and temporal analysis of daily terrestrial water storage anomalies in China","authors":"Weiwei Li, Kun Wang, Xiaonan Li","doi":"10.1007/s40328-024-00452-z","DOIUrl":"https://doi.org/10.1007/s40328-024-00452-z","url":null,"abstract":"The spatial–temporal evolution of terrestrial water storage anomalies (TWSA) is crucial in monitoring floods and sustainable water management. Unlike monthly gravity models, daily models can obtain TWSA at daily resolution, which demonstrates advantages in monitoring short-term floods. Moreover, with sufficient observations it is possible to capture the temporal characteristics of TWSA. In this paper the TWSA of nine major drainage basins in China spanning from January 2003 to August 2016 are estimated. The spatial variations of the Yangtze drainage basin which is taken as example accurately reflect the 15 July, 2010 flood. The variation of Wetness Index (WI) agrees well with that of discharge of DaTong gauging station. Meanwhile, WI shows four days lead-time prior to the flood, which can be regarded as early warning indictor in ungauged basin. For the temporal analysis, noise characteristics of TWSA are assessed, which show that the optimal noise model is autoregression moving average noise (ARMA) but with different orders for different basins. With the optimal ARMA noise, the uncertainties of estimated parameters can reach up to 28 times that considering only white noise. Therefore, to get the comprehensive temporal features of daily TWSA, its time-correlated characteristics cannot be neglected.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222770","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}

引用次数: 0

Enhancing landslide inventory mapping through Multi-SAR image analysis: a comprehensive examination of current landslide zones 通过多合成孔径雷达图像分析加强滑坡清查制图：对当前滑坡带的全面检查

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-08-19 DOI: 10.1007/s40328-024-00450-1

Fatih Kadi, Ekrem Saralioglu

{"title":"Enhancing landslide inventory mapping through Multi-SAR image analysis: a comprehensive examination of current landslide zones","authors":"Fatih Kadi, Ekrem Saralioglu","doi":"10.1007/s40328-024-00450-1","DOIUrl":"https://doi.org/10.1007/s40328-024-00450-1","url":null,"abstract":"Landslide inventory maps (LIMs) are a map type that provides information to the user about the landslides. The high accuracy of this map enables outputs derived from it to be produced more realistically and accurately. LIMs are generally produced by the requests from the user, taking into account the regions where access is easy, where settlements are located and using traditional techniques. LIMs produced for areas where access is limited or settlements are absent generally have distant, low accuracy, and unreliable data because landslides in these regions are often not considered. This study aims to investigate the landslides using multi-temporal SAR imagery and to develop a methodology to improve the LIM by new landslides. The results show that the velocities of PS points falling on the landslides are between − 11.2 and 14.9 mm/y. Then, the regions defined as possible landslides were identified by analyzing the velocity model produced with the help of the kriging interpolation. The potential landslides overlapped with those recorded by public institutions and organizations, and eight new landslides consisting of approximately 8.32 km2 were identified. Finally, these new landslides were examined regarding slope degree and soil groups by overlapping with land use capability maps. Results indicated that all new landslides were located in landslide-prone areas. The detection of new landslides and monitoring of landslides were carried out in a practical, highly accurate, and cost-effective manner using the developed methodology.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222771","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}

引用次数: 0

Electrical resistivity and magnetic methods in mapping groundwater on the western margin of the Central Main Ethiopian Rift- A case study in the Belesa area, eastern Lemmo Woreda, Ethiopia 电阻率和磁性方法在绘制埃塞俄比亚中央主断裂带西缘地下水图中的应用--埃塞俄比亚东部 Lemmo Woreda 的 Belesa 地区案例研究

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-08-07 DOI: 10.1007/s40328-024-00449-8

Esubalew Yehualaw, Tigistu Haile, Kevin Mickus, Graeme Beardsmore, Wubamlak Nigusse

{"title":"Electrical resistivity and magnetic methods in mapping groundwater on the western margin of the Central Main Ethiopian Rift- A case study in the Belesa area, eastern Lemmo Woreda, Ethiopia","authors":"Esubalew Yehualaw, Tigistu Haile, Kevin Mickus, Graeme Beardsmore, Wubamlak Nigusse","doi":"10.1007/s40328-024-00449-8","DOIUrl":"https://doi.org/10.1007/s40328-024-00449-8","url":null,"abstract":"Vertical electrical sounding (VES) and magnetic data were analyzed to infer the groundwater system in the Belesa area within the central Main Ethiopian Rift. The analysis is aimed at aiding in determining the groundwater potential for current and future development of groundwater resources within the Belesa area. The analysis of two-dimensional magnetic forward and one-dimensional electrical inverse models aided in locating faults, fractures, and lithological units that may contain groundwater. Lithological logs from nearby boreholes where lithological units had been determined were used to constrain the magnetic and VES models. The VES models and a magnetic derivative (tilt and horizontal) analysis mapped the existence of several possible fractures and faults that may act as either barriers or conduits for groundwater movement. The magnetic and electrical resistivity models indicated a potential aquifer associated with low electrical resistivity values occurring between 120 and 240 m in depth within the weathered and fractured ignimbrites which are bounded by faults, plus an additional potential deeper aquifer within a sandy pumice layer. Low electrical resistivity horizons provide targets for future drilling for water and a base for geophysical surveys that would further delineate the groundwater system in the Belesa area.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946404","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}

引用次数: 0

Interpretation of magnetic measurements of the CHAMP and Swarm-A satellites over the Pannonian Basin 解读CHAMP和Swarm-A卫星对潘诺尼亚盆地的磁性测量结果

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-08-06 DOI: 10.1007/s40328-024-00445-y

K I Kis, P T Taylor, S Puszta, B Toronyi

引用次数: 0

Suppressing stripe noise in GRACE/GFO level-2 products with dual low-pass filtering 利用双低通滤波器抑制 GRACE/GFO 2 级产品中的条纹噪声

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-07-03 DOI: 10.1007/s40328-024-00448-9

Yong Feng, Yajie Yu, Shubi Zhang, Guobin Chang, Yu Cao, Nijia Qian, Yueyang Huan

{"title":"Suppressing stripe noise in GRACE/GFO level-2 products with dual low-pass filtering","authors":"Yong Feng, Yajie Yu, Shubi Zhang, Guobin Chang, Yu Cao, Nijia Qian, Yueyang Huan","doi":"10.1007/s40328-024-00448-9","DOIUrl":"https://doi.org/10.1007/s40328-024-00448-9","url":null,"abstract":"The results obtained through GRACE/GRACE Follow-On spherical harmonic coefficient model exhibit noticeable north–south strip noise. While applying low-pass filtering along the latitude circle direction can effectively eliminate the north–south strip error, it unavoidably introduces east–west strip noise. This paper introduces a method that utilizes the cosine function to determine the cutoff frequency for the low-pass filtering in the latitude direction. Additionally, a low-pass filtering step is added in the meridian circle direction. This combined approach successfully mitigates the north–south strip error and simultaneously suppresses the east–west strip noise. The analysis results highlight the improvement in signal to noise ratio of global surface quality anomaly estimation achieved by utilizing the cosine function to determine the cutoff frequency. The use of data from five institutions reveals that the dual low-pass filtering (DLP) improves the signal to noise ratio by more than 2% compared to the traditional efficient low-pass-filtering (ELP). When analyzing the uncertainty in the Yangtze River Basin using the three-cornered hat method, it is observed that the uncertainties of the DLP solution, traditional ELP solution, and mascon solution are comparable. Furthermore, the DLP solution exhibits the smallest uncertainty, measured at 4.89 cm. In terms of root mean square error, the DLP almost consistently yields the lowest values across various regions, with the difference from the smallest root mean square error value remaining within 2 mm in certain regions.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141550738","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}

引用次数: 0

Using archived magnetotelluric data for geologic interpretation in the Transdanubian Region 利用存档的磁电图勒数据进行外多瑙河地区的地质解释

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-06-27 DOI: 10.1007/s40328-024-00440-3

Renáta Szebenyi, János Kiss, Gábor Herkules Héja

{"title":"Using archived magnetotelluric data for geologic interpretation in the Transdanubian Region","authors":"Renáta Szebenyi, János Kiss, Gábor Herkules Héja","doi":"10.1007/s40328-024-00440-3","DOIUrl":"https://doi.org/10.1007/s40328-024-00440-3","url":null,"abstract":"We provide a key magnetotelluric section, composed of archived magnetotelluric data along a NW-SE profile in Transdanubia, Hungary. For the interpretation of the key section, observations from raw magnetotelluric data and inversion results were used. In addition, other geophysical-geological information was also considered to confirm the conclusions based on the electrical resistivity sections. All this information was combined to identify the main structural lines and geologic units along the profile. Main structural lines observed on the resistivity sections are the Alpokalja line, Rába line, Balaton line, Kapos line, and Mecsekalja line. Geologic units that can be delineated due to their resistivity contrast include the Lower and Upper Austroalpine Units, the Transdanubian Range Unit, the Mid-Hungarian Megaunit, the Tisza Megaunit and sedimentary rocks filling the sub-basins of the Miocene Pannonian back-arc basin. The inversion results of the transverse magnetic (TM) polarization mode and the phase-depth sections of the raw data were found to be the most suitable for detecting the morphology and identifying the depth of the Pre-Cenozoic basement along the profile.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552938","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}

引用次数: 0

Chebyshev polynomial-based Fourier transformation and it’s use in low pass filter of gravity data 基于切比雪夫多项式的傅立叶变换及其在重力数据低通滤波器中的应用

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2024-05-27 DOI: 10.1007/s40328-024-00444-z

Omar Al Marashly, Mihály Dobróka

{"title":"Chebyshev polynomial-based Fourier transformation and it’s use in low pass filter of gravity data","authors":"Omar Al Marashly, Mihály Dobróka","doi":"10.1007/s40328-024-00444-z","DOIUrl":"https://doi.org/10.1007/s40328-024-00444-z","url":null,"abstract":"In this paper, we introduce the novel Chebyshev Polynomials Least-Squares Fourier Transformation (C-LSQ-FT) and its robust variant with the Iteratively Reweighted Least-Squares technique (C-IRLS-FT). These innovative techniques for Fourier transformation are predicated on the concept of inversion, and the C-LSQ-FT method establishes an overdetermined inverse problem within the realm of Fourier transformation. However, given the LSQ approach’s vulnerability to data outliers, we note the potential for considerable errors and potentially unrepresentative model estimations. To circumvent these shortcomings, we incorporate Steiner’s Most Frequent Value method into our framework, thereby providing a more reliable alternative. The fusion of the Iteratively Reweighted Least-Squares (IRLS) algorithm with Cauchy-Steiner weights enhances the robustness of our Fourier transformation process, culminating in the C-IRLS-FT method. We use Chebyshev polynomials as the basis functions in both methods, leading to the approximation of continuous Fourier spectra through a finite series of Chebyshev polynomials and their corresponding coefficients. The coefficients were obtained by solving an overdetermined non-linear inverse problem. We validated the performance of both the traditional Discrete Fourier Transform (DFT) and the newly developed C-IRLS-FT through numerical tests on synthetic datasets. The results distinctly exhibited the reduced sensitivity of the C-IRLS-FT method to outliers and dispersed noise, in comparison with the traditional DFT. We leveraged the newly proposed (C-IRLS-FT) technique in the application of low-pass filtering in the context of gravity data. The results corroborate the technique’s robustness and adaptability, making it a promising method for future applications in geophysical data processing.","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141167638","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}

引用次数: 0