Pub Date : 2023-10-09DOI: 10.1080/08123985.2023.2265403
Lei Wang, Fei Li, Wei Wang, Chunyu Liu
AbstractNew government policy in China has facilitated research on the hazards in open-pit mine slopes. Remote sensing, geological, geophysical, and computer simulation techniques have been applied to obtain better information in slope investigation. In this study, we investigated the slope of the Qianlingshan open-pit mine area in Beijing, China. Electrical resistivity tomography and ground-penetrating radar were used, and the results were compared with borehole data to ascertain the slope structure, potential slip surface, and deformation zone. A geological model of the slope was established, and the slope stability was analyzed by numerical simulation. The results showed that the slope had an unstable surface layer over bedrock, and probable creep sliding-tension deformation. In addition, the slope would become less stable in wet conditions. The geological methods used in this study will provide a useful reference for further slope stability analysis and prevention.We took the Qianlingshan open-pit slope in Beijing, China, as the research object, by comprehensive application of historical remote sensing images analysis, field investigation, electrical resistivity tomography (ERT) and ground penetrating radar (GPR), and comparative analysis with borehole data, to obtain the slope parameter such as resistivity and velocity of electromagnetic wave, and to ascertain the slope structure, potential slip surface and deformation zone. On this basis, the geological generalisation model of slope was established, and the failure mechanism and stability of slope were analyzed by numerical simulation.KEYWORDS: Abandoned mineoverburden-bedrock slopegeological investigationselectrical resistivity tomography (ERT)ground penetrating radar (GPR)failure mechanism analysis AcknowledgementsWe would like to acknowledge Chunyu Liu and his team from China Coal Geology Group Company Limited for their invaluable assistance in the field work. We are also grateful to Prof. Chao Shen and Dr. Xin Huang for their comments that helped to improve the first version of paper.Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis study was supported by the Fundamental Research Funds for the Central Universities (grant number ZY20215125) and the Fund from the Key Laboratory of Active Tectonics and Geological Safety of Ministry of Natural Resources (grant number 20201203).
{"title":"Application research of comprehensive geophysical prospecting in a typical slope of abandoned open-pit in Beijing, China","authors":"Lei Wang, Fei Li, Wei Wang, Chunyu Liu","doi":"10.1080/08123985.2023.2265403","DOIUrl":"https://doi.org/10.1080/08123985.2023.2265403","url":null,"abstract":"AbstractNew government policy in China has facilitated research on the hazards in open-pit mine slopes. Remote sensing, geological, geophysical, and computer simulation techniques have been applied to obtain better information in slope investigation. In this study, we investigated the slope of the Qianlingshan open-pit mine area in Beijing, China. Electrical resistivity tomography and ground-penetrating radar were used, and the results were compared with borehole data to ascertain the slope structure, potential slip surface, and deformation zone. A geological model of the slope was established, and the slope stability was analyzed by numerical simulation. The results showed that the slope had an unstable surface layer over bedrock, and probable creep sliding-tension deformation. In addition, the slope would become less stable in wet conditions. The geological methods used in this study will provide a useful reference for further slope stability analysis and prevention.We took the Qianlingshan open-pit slope in Beijing, China, as the research object, by comprehensive application of historical remote sensing images analysis, field investigation, electrical resistivity tomography (ERT) and ground penetrating radar (GPR), and comparative analysis with borehole data, to obtain the slope parameter such as resistivity and velocity of electromagnetic wave, and to ascertain the slope structure, potential slip surface and deformation zone. On this basis, the geological generalisation model of slope was established, and the failure mechanism and stability of slope were analyzed by numerical simulation.KEYWORDS: Abandoned mineoverburden-bedrock slopegeological investigationselectrical resistivity tomography (ERT)ground penetrating radar (GPR)failure mechanism analysis AcknowledgementsWe would like to acknowledge Chunyu Liu and his team from China Coal Geology Group Company Limited for their invaluable assistance in the field work. We are also grateful to Prof. Chao Shen and Dr. Xin Huang for their comments that helped to improve the first version of paper.Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis study was supported by the Fundamental Research Funds for the Central Universities (grant number ZY20215125) and the Fund from the Key Laboratory of Active Tectonics and Geological Safety of Ministry of Natural Resources (grant number 20201203).","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093189","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}
Pub Date : 2023-09-18DOI: 10.1080/08123985.2023.2256364
He Li, Huake Cao, Xiu Li, Zhipeng Qi
AbstractAs a relatively common geological disaster, ground collapse often occurs in urban areas. In view of the complex urban environment, and to effectively identify the areas with potential ground collapse, a new detection method was researched for the demand of fine exploration for urban underground hydraulic connection channels. According to the actual situation, the source was flexibly arranged in areas with good grounding, such as flower beds on the ground. An unmanned aerial vehicle (UAV) was adopted to carry the receiver for data collection in the air. This method would less affected by the flight height, and is thus more suitable for urban environments with tall buildings. Then, geological modeling was built based on the real geological conditions of a city, four underground hydraulic connection channels were set, and the method in the paper was used for detection. The apparent resistivity results effectively present the characteristics of the hydraulic connection channel. The method also provides an effective means for the detection of urban underground hydraulic connection, as well as a basis for efficient investigation with potential ground collapse and corresponding prevention and treatment in advance.KEYWORDS: Ground collapsesemi-airborne transient electromagnetic3D forward modelingtime-domain vector finite elementurban underground hydraulic connection Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis paper is supported by the Hebei Provincial Department of Human Resources and Social Security to introduce overseas students funding project (grant no. C20230368), the Key Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei Urban Agglomeration, Ministry of Natural Resources of the People's Republic of China (grant no. ZB2022003).
{"title":"Numerical study on urban hidden geological hazard detection based on the semi-airborne transient electromagnetic method","authors":"He Li, Huake Cao, Xiu Li, Zhipeng Qi","doi":"10.1080/08123985.2023.2256364","DOIUrl":"https://doi.org/10.1080/08123985.2023.2256364","url":null,"abstract":"AbstractAs a relatively common geological disaster, ground collapse often occurs in urban areas. In view of the complex urban environment, and to effectively identify the areas with potential ground collapse, a new detection method was researched for the demand of fine exploration for urban underground hydraulic connection channels. According to the actual situation, the source was flexibly arranged in areas with good grounding, such as flower beds on the ground. An unmanned aerial vehicle (UAV) was adopted to carry the receiver for data collection in the air. This method would less affected by the flight height, and is thus more suitable for urban environments with tall buildings. Then, geological modeling was built based on the real geological conditions of a city, four underground hydraulic connection channels were set, and the method in the paper was used for detection. The apparent resistivity results effectively present the characteristics of the hydraulic connection channel. The method also provides an effective means for the detection of urban underground hydraulic connection, as well as a basis for efficient investigation with potential ground collapse and corresponding prevention and treatment in advance.KEYWORDS: Ground collapsesemi-airborne transient electromagnetic3D forward modelingtime-domain vector finite elementurban underground hydraulic connection Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis paper is supported by the Hebei Provincial Department of Human Resources and Social Security to introduce overseas students funding project (grant no. C20230368), the Key Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei Urban Agglomeration, Ministry of Natural Resources of the People's Republic of China (grant no. ZB2022003).","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135206374","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}
Pub Date : 2023-09-12DOI: 10.1080/08123985.2023.2254798
C.J. O’Neill
Reconstruction of discretely sampled geophysical data is generally done via gridding or interpolant algorithms. Such approaches typically consider local gradients which, while emphasising small-scale structure, can also introduce gridding artefacts, and modify the frequency characteristics of the original data. Here, we examine the potential of compressed sensing techniques for spatially-varying geophysical data, particularly line and gridded aeromagnetic data. We show that for sub-Nyquist sampling rates, the approach is still able to reconstruct a legible signal, and demonstrate the frequency representation of the reconstructed data varies with data sampling frequency, showing a reduced frequency range for sparser sampling. In contrast, we demonstrate that many widespread gridding approaches artificially introduce high-frequency signals into the gridded maps that are not present in the original nor in the compressed sensing reconstructions. This demonstrates the limitations of conventional gridding approaches in spectral fidelity and also suggests the conditions under which compressed sensing may be a more appropriate interpolant technique – namely when authentic spectral representation of the data is of higher precedent than small-scale target identification.
{"title":"Compressed sensing reconstruction of sparse geophysical data: an example from regional magnetics","authors":"C.J. O’Neill","doi":"10.1080/08123985.2023.2254798","DOIUrl":"https://doi.org/10.1080/08123985.2023.2254798","url":null,"abstract":"Reconstruction of discretely sampled geophysical data is generally done via gridding or interpolant algorithms. Such approaches typically consider local gradients which, while emphasising small-scale structure, can also introduce gridding artefacts, and modify the frequency characteristics of the original data. Here, we examine the potential of compressed sensing techniques for spatially-varying geophysical data, particularly line and gridded aeromagnetic data. We show that for sub-Nyquist sampling rates, the approach is still able to reconstruct a legible signal, and demonstrate the frequency representation of the reconstructed data varies with data sampling frequency, showing a reduced frequency range for sparser sampling. In contrast, we demonstrate that many widespread gridding approaches artificially introduce high-frequency signals into the gridded maps that are not present in the original nor in the compressed sensing reconstructions. This demonstrates the limitations of conventional gridding approaches in spectral fidelity and also suggests the conditions under which compressed sensing may be a more appropriate interpolant technique – namely when authentic spectral representation of the data is of higher precedent than small-scale target identification.","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135885302","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}
Pub Date : 2023-08-30DOI: 10.1080/08123985.2023.2251520
L. De Giorgi, F. Comisi, D. F. Barbolla, L. Longhitano, C. Torre, G. Leucci
{"title":"The Basilica of Santa Croce (Lecce- Italy): study the conservation state by ground-penetrating radar and electrical resistivity tomography","authors":"L. De Giorgi, F. Comisi, D. F. Barbolla, L. Longhitano, C. Torre, G. Leucci","doi":"10.1080/08123985.2023.2251520","DOIUrl":"https://doi.org/10.1080/08123985.2023.2251520","url":null,"abstract":"","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46849004","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}
Pub Date : 2023-08-27DOI: 10.1080/08123985.2023.2249926
Amarsaikhan Tsogtbaatar, M. Sato
{"title":"Characterisation of geological thin layer by borehole radar","authors":"Amarsaikhan Tsogtbaatar, M. Sato","doi":"10.1080/08123985.2023.2249926","DOIUrl":"https://doi.org/10.1080/08123985.2023.2249926","url":null,"abstract":"","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45891087","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}
Pub Date : 2023-08-24DOI: 10.1080/08123985.2023.2249514
Wenbin Jiang, Y. Ruan
{"title":"A progressive data assimilation strategy in full-waveform adjoint tomography","authors":"Wenbin Jiang, Y. Ruan","doi":"10.1080/08123985.2023.2249514","DOIUrl":"https://doi.org/10.1080/08123985.2023.2249514","url":null,"abstract":"","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45629003","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}
Pub Date : 2023-08-19DOI: 10.1080/08123985.2023.2242885
N. Abate, D. Roubis, F. Sogliani, V. Vitale, M. Sileo, P. Arzu, R. Lasaponara, N. Masini
{"title":"Integrated use of GIS and remote sensing techniques for landscape-scale archaeological analysis: the case study of Metaponto, Basilicata, Italy","authors":"N. Abate, D. Roubis, F. Sogliani, V. Vitale, M. Sileo, P. Arzu, R. Lasaponara, N. Masini","doi":"10.1080/08123985.2023.2242885","DOIUrl":"https://doi.org/10.1080/08123985.2023.2242885","url":null,"abstract":"","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43507774","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}
Pub Date : 2023-08-16DOI: 10.1080/08123985.2023.2190017
Chuantao Yu, Zhang Xi, Wu Xin, Mingyu Tang, Wang Zheng
{"title":"The effects of relative position of anomalous body and topography on the semi-airborne transient electromagnetic survey","authors":"Chuantao Yu, Zhang Xi, Wu Xin, Mingyu Tang, Wang Zheng","doi":"10.1080/08123985.2023.2190017","DOIUrl":"https://doi.org/10.1080/08123985.2023.2190017","url":null,"abstract":"","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44974663","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}
Pub Date : 2023-08-16DOI: 10.1080/08123985.2023.2246492
Wenping Jiang, I. Roach, M. Doublier, J. Duan, A. Schofield, A. Clark, R. Brodie
{"title":"Application of audio-frequency magnetotelluric data to cover characterisation – validation against borehole petrophysics in the East Tennant region, Northern Australia","authors":"Wenping Jiang, I. Roach, M. Doublier, J. Duan, A. Schofield, A. Clark, R. Brodie","doi":"10.1080/08123985.2023.2246492","DOIUrl":"https://doi.org/10.1080/08123985.2023.2246492","url":null,"abstract":"","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44322738","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}
Pub Date : 2023-08-01DOI: 10.1080/08123985.2023.2236154
E. Eshaghi, R. Vayavur, Richard S. Smith, C. Mancuso, F. Della Justina, J. Ayer
Geophysical inversions give non-uniqueness solutions and unless constrained by appropriate initial values and geological constraints can give unrealistic results. One of the critical constraints can be the physical property values of different lithologies. We have compiled a density and magnetic susceptibility database consisting of thousands of measurements collated from different organisations and/or projects across the Abitibi greenstone belt. Statistical tools (histograms, quantile-quantile probability plots and boxplots) are applied to characterise systematically major and minor lithologies. We observed that the magnetic susceptibility frequently has a bimodal distribution, while density is typically unimodal. Our results are summarized in a table that includes the representative mean (or median) and a range of acceptable values. These values can be used to better understand the regional geology, but in this paper, we used the tabulated properties in a geophysical/petrophysical inversion of gravity data from the Chicobi area in the Abitibi subprovince to show the level of improvements that the petrophysical constraints can add to an unconstrained model. When our density database is used to seed the initial guess in a gravity inversion, an anomalous zone becomes apparent that was less evident on an unconstrained inversion.
{"title":"Density and magnetic susceptibility of major rock types within the Abitibi greenstone belt: a compilation with examples of its use in constraining inversion","authors":"E. Eshaghi, R. Vayavur, Richard S. Smith, C. Mancuso, F. Della Justina, J. Ayer","doi":"10.1080/08123985.2023.2236154","DOIUrl":"https://doi.org/10.1080/08123985.2023.2236154","url":null,"abstract":"Geophysical inversions give non-uniqueness solutions and unless constrained by appropriate initial values and geological constraints can give unrealistic results. One of the critical constraints can be the physical property values of different lithologies. We have compiled a density and magnetic susceptibility database consisting of thousands of measurements collated from different organisations and/or projects across the Abitibi greenstone belt. Statistical tools (histograms, quantile-quantile probability plots and boxplots) are applied to characterise systematically major and minor lithologies. We observed that the magnetic susceptibility frequently has a bimodal distribution, while density is typically unimodal. Our results are summarized in a table that includes the representative mean (or median) and a range of acceptable values. These values can be used to better understand the regional geology, but in this paper, we used the tabulated properties in a geophysical/petrophysical inversion of gravity data from the Chicobi area in the Abitibi subprovince to show the level of improvements that the petrophysical constraints can add to an unconstrained model. When our density database is used to seed the initial guess in a gravity inversion, an anomalous zone becomes apparent that was less evident on an unconstrained inversion.","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"54 1","pages":"647 - 669"},"PeriodicalIF":0.9,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44421489","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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