Acta Geodaetica et Geophysica最新文献_第6页

Transformation from a global spherical to an adjusted local rectangular harmonic model 从全局球面模型到调整局部矩形调和模型的转换

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2023-02-21 DOI: 10.1007/s40328-023-00406-x

Georgios Panou, Romylos Korakitis

引用次数: 1

Simultaneous model-based inversion of pre-stack 3D seismic data targeting a deep geothermal reservoir, Northwest Hungary 基于模型的匈牙利西北部深层地热储层叠前三维地震数据同步反演

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2023-02-16 DOI: 10.1007/s40328-023-00404-z

Emad N. Masri, Ernő Takács

{"title":"Simultaneous model-based inversion of pre-stack 3D seismic data targeting a deep geothermal reservoir, Northwest Hungary","authors":"Emad N. Masri, Ernő Takács","doi":"10.1007/s40328-023-00404-z","DOIUrl":"10.1007/s40328-023-00404-z","url":null,"abstract":"<div><p>The well-known, traditional way to extend P-wave acoustic impedance data between and beyond the well log locations is the post-stack inversion of seismic data usually available in the surroundings of the boreholes. A relatively new trend in the seismic exploration is based on the pre-stack inversion of the seismic CDP gathers providing both the P- and S-wave acoustic impedance sections (and volumes), as well as the estimated density data. This methodology is often called as simultaneous model-based inversion and can be utilized not only for hydrocarbon exploration, but it might also be a useful tool for the investigation of geothermal resources. In this study, we will compare the results of post-stack and pre-stack acoustic impedance inversions utilizing the same seismic volume. We will demonstrate and analyze the inverted attribute sections (and some of their derivatives) obtained by the pre-stack algorithm in detail. Finally, we will draw the conclusions about the lithological discrimination of the studied complex carbonate geothermal reservoir located in the pre-Cenozoic basement of the Little Hungarian Plain.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"58 1","pages":"19 - 33"},"PeriodicalIF":1.4,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40328-023-00404-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4934503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ground penetrating radar forward modeling of roads based on random media model 基于随机介质模型的探地雷达道路正演模拟

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2023-02-16 DOI: 10.1007/s40328-023-00403-0

Wenliang Zhang, Gongfeng Xin, Guanxu Long, Lei Song

{"title":"Ground penetrating radar forward modeling of roads based on random media model","authors":"Wenliang Zhang, Gongfeng Xin, Guanxu Long, Lei Song","doi":"10.1007/s40328-023-00403-0","DOIUrl":"10.1007/s40328-023-00403-0","url":null,"abstract":"<div><p>Road structure is composed of different pavement materials. These materials contain a large number of particles and pores with different sizes, shapes, dielectric properties and spatial locations, which determines the electromagnetic properties of roads. These feature multi-scale and discontinuous characteristics between layers, together with geometric irregularity and random non-uniformity characteristics within layers, therefore random structures will undoubtedly have a negative impact on GPR detection and data interpretation. As a supplement to the experimental observation, the forward modeling based on random media model can provide an economical and effective way for GPR detection of road hidden diseases. In this paper, discrete random media model and continuous random media model are established respectively by using digital image processing technology and stochastic process theory according to the structural characteristics of different layers of media in road structure. On the basis of the established random media model, the GPR response of holes and pipelines are simulated and analyzed by the Finite Difference Time Domain method, and the GPR signal is processed by the synthetic aperture focused imaging method. By comparing with homogeneous layered models, the results show that the forward modeling based on random media model can reflect the characteristics of ground penetrating radar signal of road structure more accurately. PVC pipe is accompanied by obvious multiple waves in the case of water filling. The polarity relationship between reflected wave and direct wave is the key to distinguish whether it is iron pipe or cavity. Synthetic aperture focused imaging algorithm can enhance the recognition of spatial location, size and dielectric properties of the target. The comparison with the field results shows that the simulated results are in reasonable agreement with the measured ones.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"58 1","pages":"109 - 122"},"PeriodicalIF":1.4,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4643418","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

An automatic procedure for earthquake analysis using real-time data 使用实时数据进行地震分析的自动程序

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2023-02-08 DOI: 10.1007/s40328-023-00402-1

M. Craiu, A. Craiu, M. Mihai, A. Marmureanu

{"title":"An automatic procedure for earthquake analysis using real-time data","authors":"M. Craiu, A. Craiu, M. Mihai, A. Marmureanu","doi":"10.1007/s40328-023-00402-1","DOIUrl":"10.1007/s40328-023-00402-1","url":null,"abstract":"<div><p>The seismicity of Romania is mostly represented by earthquakes produced by the Vrancea seismic source with intermediate depth events (3 shocks/century with magnitude M<sub>W</sub> greater than 7.0). The seismic activity in Romania also includes crustal earthquakes. The crustal seismicity is more scattered and moderate compared to the intermediate-depth one. A stable and automatic method has been implemented in the real-time data acquisition and processing system ANTELOPE to estimate the seismic moment, the moment magnitude and the corner frequency of events recorded by the velocity sensors, using spectral analysis applied to S waves. The main goals are the independent estimation of the seismic moment and the common characterization for all events recorded by the National Seismic Network. The main target of this paper is represented by the fast estimation of moment magnitude M<sub>W</sub> and ground motion parameters that are derived using Gallo et al. (Bull Earthquake Eng 12:185–202, 2014) methodology and their validation with other magnitude determination algorithms existing at the National Institute for Earth Physics (NIEP). To test this new methodology, we have analyzed 331 seismic events, most of them being automaticaly located, and afterwards added a new, manually processed solution for events with M<sub>L</sub> ≥ 4.5, to obtain a larger interval of magnitudes.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"58 1","pages":"1 - 18"},"PeriodicalIF":1.4,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4337166","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: 1

A prediction method for abrasion loss rate of some Egyptian carbonate rocks due to cyclic salt crystallization weathering using physico-mechanical deterioration: insights from laboratory investigations 利用物理-机械劣化预测埃及一些碳酸盐岩因循环盐结晶风化造成的磨蚀损失率的方法：实验室调查的启示

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2023-02-02 DOI: 10.1007/s40328-023-00401-2

Marzouk Mohamed Aly Abdelhamid, B. G. Mousa

{"title":"A prediction method for abrasion loss rate of some Egyptian carbonate rocks due to cyclic salt crystallization weathering using physico-mechanical deterioration: insights from laboratory investigations","authors":"Marzouk Mohamed Aly Abdelhamid, B. G. Mousa","doi":"10.1007/s40328-023-00401-2","DOIUrl":"10.1007/s40328-023-00401-2","url":null,"abstract":"<div><p>Salt crystallization is the most important weathering processes that causes problems for rocks used as building stones. Therefore, assessment of the physico-mechanical properties of stones against cyclic salt crystallization is a critical issue for rock engineering applications in salty environmental conditions especially prone to abrasion. This research aims at investigating the relationship between the degradation of various physico-mechanical properties including apparent porosity, point load index, unconfined compression strength and abrasion loss rate for rocks during salt weathering process. For showing rock weathering in the salt crystallization process, five kinds of carbonate rocks were sampled from different areas of Egypt and subject to cyclic salt crystallization, up to twenty cycles. The variation rates of their physico-mechanical characteristics and abrasion loss values were calculated after each five cycles of salt weathering. The results showed that the studied rocks are suitable for use as building and decorative stones in areas prone to crystallization of salts, but attention must be paid to rocks with high porosity and low strength characteristics such as El-Minia limestone specimens. It was also found that there are strong linear correlations between the physico-mechanical degradation parameters and the abrasion loss rate of the studied rock samples at the end of the twentieth cycle of salt weathering. These relationships may be used to estimate the abrasion loss rate of the studied rock types against the cyclic salt weathering conditions and hence to make a rapid evaluation of the stone durability.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"58 1","pages":"53 - 70"},"PeriodicalIF":1.4,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40328-023-00401-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4080069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Land use/land cover classification with Landsat-8 and Landsat-9 satellite images: a comparative analysis between forest- and agriculture-dominated landscapes using different machine learning methods Landsat-8和Landsat-9卫星图像的土地利用/土地覆盖分类:使用不同机器学习方法对森林和农业为主的景观进行比较分析

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2022-12-16 DOI: 10.1007/s40328-022-00400-9

Ekrem Saralioglu, Can Vatandaslar

{"title":"Land use/land cover classification with Landsat-8 and Landsat-9 satellite images: a comparative analysis between forest- and agriculture-dominated landscapes using different machine learning methods","authors":"Ekrem Saralioglu, Can Vatandaslar","doi":"10.1007/s40328-022-00400-9","DOIUrl":"10.1007/s40328-022-00400-9","url":null,"abstract":"<div><p>The Landsat program, which started in 1972 with Landsat-1, continues today with its newest satellite, Landsat-9, launched on 27 October 2021. The Landsat-9 data have been freely distributed since 10 February 2022 on the Earth Explorer platform. However, no scientific study on Landsat-9 for land use/land cover (LULC) mapping has yet been published, focusing on specific eco-systems. Therefore, the present study investigates the potential of Landsat-9 images for LULC classification in forest and agricultural systems. To achieve this, we selected two study areas, i.e. Kaynarca (forest-dominated) and Hocalar (agriculture-dominated), from different ecoregions of Turkey. Then, we mapped their LULCs using Landsat-8 and Landsat-9 data with the Support Vector Machine, K-Nearest Neighbors (K-NN), Light Gradient Boosting Machine (LightGBM), and 3D Convolutional Neural Network (3D-CNN) methods. The classification accuracies were assessed with the F1-score, taking the stand-types maps of the case areas as reference. It was seen that the best maps were generated by the 3D-CNN method with accuracy rates of 88.0% for Kaynarca (Landsat-8) and 87.4% for Hocalar (Landsat-9) at the landscape level. Unlike other methods, 3D-CNN removed the “salt-and-pepper effect” on the maps providing better spatial structure for further analyses. Regardless of the satellite missions, the mapping accuracies for the “productive forest” and “agriculture” classes were > 90% for Kaynarca and Hocalar, respectively. The comparative results suggest that Landsat-9 offers satisfactory LULC maps with similar classification accuracies as Landsat-8 and can be effectively used as a freely available remote sensing resource in monitoring and mapping forest- and agriculture-dominated landscapes.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"57 4","pages":"695 - 716"},"PeriodicalIF":1.4,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4640106","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: 3

Inversion of self-potential data using generalized regression neural network 用广义回归神经网络反演自电位数据

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2022-12-14 DOI: 10.1007/s40328-022-00396-2

Doğukan Durdağ, Gamze Ayhan Durdağ, Ertan Pekşen

{"title":"Inversion of self-potential data using generalized regression neural network","authors":"Doğukan Durdağ, Gamze Ayhan Durdağ, Ertan Pekşen","doi":"10.1007/s40328-022-00396-2","DOIUrl":"10.1007/s40328-022-00396-2","url":null,"abstract":"<div><p>This paper presents a method for parameter estimation of self-potential (SP) anomalies using neural networks. The General Regression Neural Network (GRNN) one-pass learning algorithm was performed to invert SP anomalies of simple shaped geometrical bodies approximation. The one-pass learning algorithm has a certain advantage in terms of computation time compared to classical neural networks because the classical neural networks use multiple learning steps. The presented algorithm was tested on noise-free and noise-corrupted synthetic data. In addition, the method was applied to three field examples: Süleymanköy, Weiss, and Sarıyer anomalies, respectively. The model parameters including electric dipole moment, polarization angle, depth, shape factor, distance from the origin of the anomaly, base slope and the base level were successfully estimated using the presented method. The frequency distribution of each model parameter was calculated to improve and overcome the ambiguity of the estimated model parameters. To investigate the correctness of the estimated model parameters, the obtained results were compared with previous studies. Thus, the agreement between the results obtained by the present method and other previous results is similar to most of the estimated model parameters in accordance with numerical values. The result of the present study shows that the GRNN can be used as a powerful parameter estimation tool in the interpretation of SP data in terms of computation time compared to artificial neural networks.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"57 4","pages":"589 - 608"},"PeriodicalIF":1.4,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4566500","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: 2

Identification of crustal deformation in the Saurashtra region, western India: insights from PSI and GNSS derived investigation 印度西部索拉斯特拉地区地壳变形的鉴定:来自PSI和GNSS衍生调查的见解

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2022-12-13 DOI: 10.1007/s40328-022-00399-z

D. Suribabu, Rakesh K. Dumka, G. C. Kothyari, K. V. Swamy, Sandip Prajapati

{"title":"Identification of crustal deformation in the Saurashtra region, western India: insights from PSI and GNSS derived investigation","authors":"D. Suribabu, Rakesh K. Dumka, G. C. Kothyari, K. V. Swamy, Sandip Prajapati","doi":"10.1007/s40328-022-00399-z","DOIUrl":"10.1007/s40328-022-00399-z","url":null,"abstract":"<div><p>The Persistent Scatterer Interferometry (PSI) and Global Navigation Satellite System (GNSS) techniques were used to identify the deformation rates in the Saurashtra region, western India. A sizable number of mild to severe earthquakes (with up to M5.1) have been observed in this part of the Indian plate. In order to calculate the crustal deformation, 241 Sentinel 1A images of path 107 with frame numbers 518 and 523, acquired between 2017 and 2020, were used. Similarly, processing of the GNSS dataset was done for four sites between 2009 and 2020. The foremost geodetic results from Saurashtra indicate the existence of a significant amount of deformation. PSI results show movements towards the satellite line of sight (LOS) of up to 5.0 ± 2.0 mm/year at several places and GNSS results indicate horizontal movements of less than 1.0 ± 0.4 mm/year and vertical movements of up to 2.3 ± 0.5 mm/year in the Saurashtra region. The projected LOS displacement of the GNSS is closely comparable with the PSI derived displacement. The results highlight isolated deformation pockets in various parts of the study area. Further, two loci with significant linear displacement were observed in south and east Saurashtra. Considering the seismic activity of the region, the inferred deformation rates may pose increased seismic risk for the region.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"57 4","pages":"639 - 659"},"PeriodicalIF":1.4,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4532208","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: 1

Deformation monitoring using passive Beidou B3I signal-based radar: a proof of concept experimental demonstration 基于被动北斗B3I信号雷达的变形监测:概念验证实验演示

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2022-12-12 DOI: 10.1007/s40328-022-00395-3

Zhuxian Zhang, Yu Zheng, Linhua Zheng, Peidong Zhu, Peng Wu

引用次数: 1

Geophysical test site in teaching, researching, field-based exercises and solving real-life work situations: a case study 地球物理试验场在教学、研究、实地练习和解决现实生活中的工作情况:一个案例研究

IF 1.4 4区地球科学

Acta Geodaetica et Geophysica Pub Date : 2022-12-06 DOI: 10.1007/s40328-022-00398-0

Joseph Omeiza Alao, K. M. Lawal, B. B. M. Dewu, J. Raimi, H. A. Lawal

{"title":"Geophysical test site in teaching, researching, field-based exercises and solving real-life work situations: a case study","authors":"Joseph Omeiza Alao, K. M. Lawal, B. B. M. Dewu, J. Raimi, H. A. Lawal","doi":"10.1007/s40328-022-00398-0","DOIUrl":"10.1007/s40328-022-00398-0","url":null,"abstract":"<div><p>A geophysical test site (GTS) is an all-important engine room in geophysics for pedagogical field-based exercises because it is a fundamental bridge builder that links the hypothetical information given in the classroom and the real problem-solving research. This paper examines the ability of 163 undergraduate and 84 postgraduate students in the identification and use of some selected geophysical equipment and geophysical data processing software to address the general decline in literacy, technical efficiency and field skills. The students' unfamiliarity with simple geophysical data processing software and geophysical equipment, which has left a question mark on the quality of national geophysical education. In addressing this, the authors applied empirical data using a diagnostic questionnaire and field-based exercise. The analysis shows that more than 70% of undergraduate and 50% of postgraduate students lack the requisite university skills to face real problem-solving in the industrial sectors. To standardize geophysical education, this study identified the establishment of GTS as one of the major factors that influence teaching, learning outcomes and research development. Student perception feedback, unemployable graduates and educational implications of GTSs were extensively examined to link up teaching and research in geophysics. Consequently, conclusions and recommendations were drawn to bridge the missing links and the shortcomings of the theoretical knowledge-based emphasized in the classroom with the real problem-solving research that will provide geophysics trainees and graduates with the kind of lifetime requisite and professional skills required to be successful in their future tasks.</p></div>","PeriodicalId":48965,"journal":{"name":"Acta Geodaetica et Geophysica","volume":"57 4","pages":"677 - 693"},"PeriodicalIF":1.4,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4245931","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: 2