Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441589
C. Funk, M. Van Den Berghe
The application of GPR in a Canadian salt and potash mine in New Brunswick, within a structurally complex geological setting, is discussed. When the mine was started in 2014, occurrences of anhydrite were unexpectedly encountered in mining development rooms. Furthermore, occasional undulations and folding in the potash ore seam complicated production mining because the potash ore would get diluted with salt. To better understand the geology, abundant geological data was gathered from both in-mine drilling and geological observations. These data provided an excellent foundation for a comprehensive GPR investigation of the geology in this mine. It is shown that GPR is a valuable tool for such mines, with potential to reduce delays in development and production caused by challenging geology
{"title":"Mapping Complex Geology with GPR in a Canadian Potash Mine","authors":"C. Funk, M. Van Den Berghe","doi":"10.1109/ICGPR.2018.8441589","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441589","url":null,"abstract":"The application of GPR in a Canadian salt and potash mine in New Brunswick, within a structurally complex geological setting, is discussed. When the mine was started in 2014, occurrences of anhydrite were unexpectedly encountered in mining development rooms. Furthermore, occasional undulations and folding in the potash ore seam complicated production mining because the potash ore would get diluted with salt. To better understand the geology, abundant geological data was gathered from both in-mine drilling and geological observations. These data provided an excellent foundation for a comprehensive GPR investigation of the geology in this mine. It is shown that GPR is a valuable tool for such mines, with potential to reduce delays in development and production caused by challenging geology","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134526804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441575
S. Ebihara, Y. Onishi, Daisuke Katanabe, H. Watanabe, Nobuhiko Shiga, K. Wada, S. Karasawa
A new design for a pulse directional borehole radar with a dipole array antenna is proposed and tested. In this radar, a pulse generator excites a pulse, with peak voltage of 110 V and low jitter at a feeding point of the transmitter. The receiver measured the difference of arrival times at several receiving dipole elements to estimate the direction of the arrival wave. We compensated for time delays due to the cables which connect the dipole elements. Field experiments were carried out with the pulse directional borehole radar in tuff; the system received a reflected wave from a metal cylinder located several meters from the radar antenna. After the cable delay compensation, we successfully estimated the 3-D location of the metal cylinder. The results offield measurements using a stepped-frequency directional borehole radar are also included for comparison.
{"title":"Field Experiments Using a Pulse Directional Borehole Radar System with a Dipole Array Antenna","authors":"S. Ebihara, Y. Onishi, Daisuke Katanabe, H. Watanabe, Nobuhiko Shiga, K. Wada, S. Karasawa","doi":"10.1109/ICGPR.2018.8441575","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441575","url":null,"abstract":"A new design for a pulse directional borehole radar with a dipole array antenna is proposed and tested. In this radar, a pulse generator excites a pulse, with peak voltage of 110 V and low jitter at a feeding point of the transmitter. The receiver measured the difference of arrival times at several receiving dipole elements to estimate the direction of the arrival wave. We compensated for time delays due to the cables which connect the dipole elements. Field experiments were carried out with the pulse directional borehole radar in tuff; the system received a reflected wave from a metal cylinder located several meters from the radar antenna. After the cable delay compensation, we successfully estimated the 3-D location of the metal cylinder. The results offield measurements using a stepped-frequency directional borehole radar are also included for comparison.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131830788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441642
Zhang Ling, Zeng Zhaofa, Li Jing, Lin Jingyi, Huang Zhipeng, Z. Jianmin
Knowledge of the subsurface structure not only provides important information on lunar geology, but also is critical for quantifying potential resources for lunar exploration and engineering for human outposts. The dual-frequency lunar penetrating radar (LPR) aboard the Yutu rover provides a unique opportunity to map subsurface structure to a depth of several hundreds of meters from the low-frequency channel and near-surface stratigraphic structure of the regolith from high-frequency observations. A low-frequency radar image can be available, based on a data processing flow. Since the data is troubled by frequency dispersion and noise which may caused by instrument, Complete Ensemble Empirical Mode Decomposition (CEEMD) helps to process and analyze the LPR data. Finally, combining with the history of the moon, regional geology, especially the Intrinsic Mode Functions (IMF) of LPR data, we give a interpretation of the subsurface structure around landing site.
{"title":"Lunar Penetrating Radar Data Processing and Analysis Based on CEEMD","authors":"Zhang Ling, Zeng Zhaofa, Li Jing, Lin Jingyi, Huang Zhipeng, Z. Jianmin","doi":"10.1109/ICGPR.2018.8441642","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441642","url":null,"abstract":"Knowledge of the subsurface structure not only provides important information on lunar geology, but also is critical for quantifying potential resources for lunar exploration and engineering for human outposts. The dual-frequency lunar penetrating radar (LPR) aboard the Yutu rover provides a unique opportunity to map subsurface structure to a depth of several hundreds of meters from the low-frequency channel and near-surface stratigraphic structure of the regolith from high-frequency observations. A low-frequency radar image can be available, based on a data processing flow. Since the data is troubled by frequency dispersion and noise which may caused by instrument, Complete Ensemble Empirical Mode Decomposition (CEEMD) helps to process and analyze the LPR data. Finally, combining with the history of the moon, regional geology, especially the Intrinsic Mode Functions (IMF) of LPR data, we give a interpretation of the subsurface structure around landing site.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441568
S. Razafindratsima, M. Sbartaï, J. Balayssac, C. Payan, S. Rakotonarivo, V. Garnier
Damages of concrete structures need to be characterized by Non Destructive Testing methods for better management. Besides many methods, developments have been made in GPR (Ground Penetrating Radar) and looking for observables other than velocity, permittivity, attenuation, arrival time, amplitude, which could be more sensitive to concrete degradations is paramount. This paper presents an analysis of the diffusion of electromagnetic waves in concrete. We have demonstrated that the “diffusivity D” and the “dissipation σ”, obtained by fitting the gprMax modelling results with the 1D analytical solution of the diffusion equation, can be used as new electromagnetic indicators to characterize the structural integrity of concretes.
{"title":"Modelling the diffusion of electromagnetic waves in concrete","authors":"S. Razafindratsima, M. Sbartaï, J. Balayssac, C. Payan, S. Rakotonarivo, V. Garnier","doi":"10.1109/ICGPR.2018.8441568","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441568","url":null,"abstract":"Damages of concrete structures need to be characterized by Non Destructive Testing methods for better management. Besides many methods, developments have been made in GPR (Ground Penetrating Radar) and looking for observables other than velocity, permittivity, attenuation, arrival time, amplitude, which could be more sensitive to concrete degradations is paramount. This paper presents an analysis of the diffusion of electromagnetic waves in concrete. We have demonstrated that the “diffusivity D” and the “dissipation σ”, obtained by fitting the gprMax modelling results with the 1D analytical solution of the diffusion equation, can be used as new electromagnetic indicators to characterize the structural integrity of concretes.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133470798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441534
E. Nilot, Xuan Feng, Yan Zhang, Minghe Zhang, Zejun Dong, Haoqiu Zhou, Xuebing Zhang
Full waveform inversion (FWI) of ground penetrating radar (GPR) is a promising imaging tool for the detailed characterization of underground targets. In this study, on-ground GPR FWI is used to construct permittivity and conductivity variations of underground targets simultaneously. We applied memoryless quasi-Newton (MLQN) method to solve inverse problem of GPR. MLQN can attain acceptable results with low computational cost and small memory storage requirements. Numerical test is examined from on-ground multi-offset GPR data and the results show that our inversion strategies are feasible and reliable in simultaneous inversion of permittivity and conductivity from on-ground GPR data.
{"title":"Multiparameter Full-waveform inversion of on-ground GPR using Memoryless quasi-Newton (MLQN) method","authors":"E. Nilot, Xuan Feng, Yan Zhang, Minghe Zhang, Zejun Dong, Haoqiu Zhou, Xuebing Zhang","doi":"10.1109/ICGPR.2018.8441534","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441534","url":null,"abstract":"Full waveform inversion (FWI) of ground penetrating radar (GPR) is a promising imaging tool for the detailed characterization of underground targets. In this study, on-ground GPR FWI is used to construct permittivity and conductivity variations of underground targets simultaneously. We applied memoryless quasi-Newton (MLQN) method to solve inverse problem of GPR. MLQN can attain acceptable results with low computational cost and small memory storage requirements. Numerical test is examined from on-ground multi-offset GPR data and the results show that our inversion strategies are feasible and reliable in simultaneous inversion of permittivity and conductivity from on-ground GPR data.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129308845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441597
Tin Wai Phoebe Wong, C. Poon, W. Lai
This paper presents the preliminary findings of a laboratory study on using GPR signal to assess concrete delamination induced by rebar corrosion in reinforced concrete structures. A concrete slab was specially designed to produce horizontal cracking between the rebars by an electrochemical method in the laboratory environment, and the corrosion process is monitored by a 2 GHz ground penetrating radar in a time-lapsed manner. Data analysis include the amplitude change and velocity change of the GPR signal measured from the rebars. Both sets of data show that the amplitude of the reflected signal from the rebars are abnormally high by at least 30% in the corroded areas, whereas the travelling velocity does not show significant differences.
{"title":"Laboratory validation of corrosion-induced delamination in concrete by ground penetrating radar","authors":"Tin Wai Phoebe Wong, C. Poon, W. Lai","doi":"10.1109/ICGPR.2018.8441597","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441597","url":null,"abstract":"This paper presents the preliminary findings of a laboratory study on using GPR signal to assess concrete delamination induced by rebar corrosion in reinforced concrete structures. A concrete slab was specially designed to produce horizontal cracking between the rebars by an electrochemical method in the laboratory environment, and the corrosion process is monitored by a 2 GHz ground penetrating radar in a time-lapsed manner. Data analysis include the amplitude change and velocity change of the GPR signal measured from the rebars. Both sets of data show that the amplitude of the reflected signal from the rebars are abnormally high by at least 30% in the corroded areas, whereas the travelling velocity does not show significant differences.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133160861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441567
M. Ercoli, L. Di Matteo, C. Pauselli
The integration of different techniques for the estimation of the volumetric water content θ in low-loss sandy soils may allow to obtain more reliable measure, after a proper evaluation of the techniques limits and their pros and cons. In particular, the integration of direct laboratory measurements performed on samples $theta$ values measured) with geophysical data collected on a soil column using a Ground Penetrating Radar (GPR) as well as a Capacitance Probe (CP), allowed us to compare the results and evaluate their accuracy. Our experimental measures, performed on two typical sandy soil outcropping in Central Italy, show that the GPR reflected pulses provide similar permittivity $(varepsilon_{mathrm{r}})$ values for both soils at very low θ. The measured $varepsilon_{r}$ values seem to progressively differ by increasing the soil moisture of the two sands. The CP shows a clear difference of measured permittivity already at lower soil moisture. As θ values in the media increase approaching the soil saturation, the CP $varepsilon_{r}$ values measured on both the two soils show a larger difference. In conclusion, the comparison between GPR and CP measures in two selected sands under controlled condition $pmb{(0.05 < theta < 0.3)}$, shows that the latter tends to overestimate $varepsilon_{mathrm{r}}$ on the entire range investigated. Nevertheless, if a specific laboratory calibration is carried out, as in the present work, reliable $theta$ values estimations can be obtained by both methods. Other measurement techniques will be tested and compared in further experiments; moreover, the calibration and integration of GPR and CP is advised not only in laboratory studies, but also to better constrain possible field applications.
{"title":"Comparison of GPR and Capacitance Probe laboratory experiments in sandy soils","authors":"M. Ercoli, L. Di Matteo, C. Pauselli","doi":"10.1109/ICGPR.2018.8441567","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441567","url":null,"abstract":"The integration of different techniques for the estimation of the volumetric water content θ in low-loss sandy soils may allow to obtain more reliable measure, after a proper evaluation of the techniques limits and their pros and cons. In particular, the integration of direct laboratory measurements performed on samples $theta$ values measured) with geophysical data collected on a soil column using a Ground Penetrating Radar (GPR) as well as a Capacitance Probe (CP), allowed us to compare the results and evaluate their accuracy. Our experimental measures, performed on two typical sandy soil outcropping in Central Italy, show that the GPR reflected pulses provide similar permittivity $(varepsilon_{mathrm{r}})$ values for both soils at very low θ. The measured $varepsilon_{r}$ values seem to progressively differ by increasing the soil moisture of the two sands. The CP shows a clear difference of measured permittivity already at lower soil moisture. As θ values in the media increase approaching the soil saturation, the CP $varepsilon_{r}$ values measured on both the two soils show a larger difference. In conclusion, the comparison between GPR and CP measures in two selected sands under controlled condition $pmb{(0.05 < theta < 0.3)}$, shows that the latter tends to overestimate $varepsilon_{mathrm{r}}$ on the entire range investigated. Nevertheless, if a specific laboratory calibration is carried out, as in the present work, reliable $theta$ values estimations can be obtained by both methods. Other measurement techniques will be tested and compared in further experiments; moreover, the calibration and integration of GPR and CP is advised not only in laboratory studies, but also to better constrain possible field applications.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"67 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114060456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441558
I. Giannakis, A. Giannopoulos, C. Warren
The ability to produce, store and analyse large amounts of well-labeled data as well as recent advancements on supervised training, led machine learning to gain a renewed popularity. In the present paper, the applicability of machine learning to simulate ground penetrating radar (GPR) for high frequency applications is examined. A well-labelled and equally distributed training set is generated synthetically using the finite-difference time-domain (FDTD) method. Special care was taken in order to model the antennas and the soils with sufficient accuracy. Through a stochastic parameterisation, each model is expressed using only seven parameters (i.e. the fractal dimension of water fraction, the height of the antenna and so on). Based on these parameters and the synthetically generated training set, a machine learning framework is trained to predict the resulting A-Scan in real-time. Thus, overcoming the time-consuming calculations required for an equivalent FDTD simulation.
{"title":"A Machine Learning Approach For Simulating Ground Penetrating Radar","authors":"I. Giannakis, A. Giannopoulos, C. Warren","doi":"10.1109/ICGPR.2018.8441558","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441558","url":null,"abstract":"The ability to produce, store and analyse large amounts of well-labeled data as well as recent advancements on supervised training, led machine learning to gain a renewed popularity. In the present paper, the applicability of machine learning to simulate ground penetrating radar (GPR) for high frequency applications is examined. A well-labelled and equally distributed training set is generated synthetically using the finite-difference time-domain (FDTD) method. Special care was taken in order to model the antennas and the soils with sufficient accuracy. Through a stochastic parameterisation, each model is expressed using only seven parameters (i.e. the fractal dimension of water fraction, the height of the antenna and so on). Based on these parameters and the synthetically generated training set, a machine learning framework is trained to predict the resulting A-Scan in real-time. Thus, overcoming the time-consuming calculations required for an equivalent FDTD simulation.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"273 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121412018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441666
S. Stadler, J. Igel
We performed a numerical study on using guided ground-penetrating radar (GPR) waves in boreholes for permittivity soundings using finite-difference (FDTD) simulations. The method presented here uses a GPR antenna that is placed next to a borehole in which a metal waveguide is lowered. Electromagnetic (EM) signals that the antenna sends out on the surface, couple to the waveguide and are reflected from the bottom end of the metal waveguide. Analysing the traveltimes yields accurate vertical distributions of the wave velocity, permittivity and water content in specified depth intervals. We performed numerical studies of the field distribution around the waveguide, the influence of the plastic borehole casing, as well as the resolution capabilites of the method in layered media. In this study, as a source, the GPR signal is introduced in the simulation via a 3D model of a real 400 MHz bowtie GPR antenna. We replicated the essential components of the antenna, e.g. the antenna bowties and metal casing, to accurately reproduce the transmitted signal. The guided wave has a skin depth drop in amplitude away from the waveguide of about 4.1 cm, Furthermore a maximum vertical resolution of high-contrast permittivity layers of about 5 cm is possible, and a formula for correcting the effect of the borehole casing on permittivity calculations is derived. We envision that this method and the insight from this study enables more precise soil soundings than other established GPR methods or time-domain reflectometry (TDR).
{"title":"A numerical study on using guided GPR waves along metallic cylinders in boreholes for permittivity sounding","authors":"S. Stadler, J. Igel","doi":"10.1109/ICGPR.2018.8441666","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441666","url":null,"abstract":"We performed a numerical study on using guided ground-penetrating radar (GPR) waves in boreholes for permittivity soundings using finite-difference (FDTD) simulations. The method presented here uses a GPR antenna that is placed next to a borehole in which a metal waveguide is lowered. Electromagnetic (EM) signals that the antenna sends out on the surface, couple to the waveguide and are reflected from the bottom end of the metal waveguide. Analysing the traveltimes yields accurate vertical distributions of the wave velocity, permittivity and water content in specified depth intervals. We performed numerical studies of the field distribution around the waveguide, the influence of the plastic borehole casing, as well as the resolution capabilites of the method in layered media. In this study, as a source, the GPR signal is introduced in the simulation via a 3D model of a real 400 MHz bowtie GPR antenna. We replicated the essential components of the antenna, e.g. the antenna bowties and metal casing, to accurately reproduce the transmitted signal. The guided wave has a skin depth drop in amplitude away from the waveguide of about 4.1 cm, Furthermore a maximum vertical resolution of high-contrast permittivity layers of about 5 cm is possible, and a formula for correcting the effect of the borehole casing on permittivity calculations is derived. We envision that this method and the insight from this study enables more precise soil soundings than other established GPR methods or time-domain reflectometry (TDR).","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123474500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441617
D. Nobes, H. Jol, G. Smith, D. Bell
The Porter's Pass Fault (PPF) is one of a number of en echelon range front faults along the coastal mountains to the east of, and parallel to, the Southern Alps and the Alpine Fault of the South Island of New Zealand. The PPF crosses the Acheron rock avalanche deposit in the Red Hill valley, just west of Lake Lyndon, near Porter's Pass. The relationship between the two is still unresolved, and ground penetrating radar (GPR) profiling was carried out in support of one study of the interrelationship of the two. Two parallel GPR profiles crossed a small ridge situated on top of a river terrace, and an additional two parallel profiles were acquired in the bed of the adjacent Bluff River. The first two profiles confirmed the presence of the PPF beneath the small ridge, and a trench yielded material for dating and for analysis of the detailed fault geometry. The second two profiles were acquired to attempt to trace the continuation of the PPF across the Bluff River, but no trace of the fault was observed. This indicates that the river has been active enough in erosion and deposition to obscure any trace of the PPF.
{"title":"Using GPR to Delineate the Porter's Pass Fault at the Acheron Rock Avalanche, New Zealand","authors":"D. Nobes, H. Jol, G. Smith, D. Bell","doi":"10.1109/ICGPR.2018.8441617","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441617","url":null,"abstract":"The Porter's Pass Fault (PPF) is one of a number of en echelon range front faults along the coastal mountains to the east of, and parallel to, the Southern Alps and the Alpine Fault of the South Island of New Zealand. The PPF crosses the Acheron rock avalanche deposit in the Red Hill valley, just west of Lake Lyndon, near Porter's Pass. The relationship between the two is still unresolved, and ground penetrating radar (GPR) profiling was carried out in support of one study of the interrelationship of the two. Two parallel GPR profiles crossed a small ridge situated on top of a river terrace, and an additional two parallel profiles were acquired in the bed of the adjacent Bluff River. The first two profiles confirmed the presence of the PPF beneath the small ridge, and a trench yielded material for dating and for analysis of the detailed fault geometry. The second two profiles were acquired to attempt to trace the continuation of the PPF across the Bluff River, but no trace of the fault was observed. This indicates that the river has been active enough in erosion and deposition to obscure any trace of the PPF.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121455964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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