Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900421
A. Milano, D. Arosio, L. Longoni, M. Papini, Greta Tresoldi, L. Zanzi
Development of early warning alarm systems for hydrogeological risk assessment is seriously under research in different European countries. In this paper, we discuss the installation and validation of a prototype electrical resistivity tomography (ERT) system for permanent monitoring of river levees. ERT measurements were performed on various candidate sections of river embankments in Lombardy and Emilia-Romagna regions in Italy for preliminary evaluation of critical sites to be monitored. Based on careful analysis of all datasets, a critical part along an earthen embankment of the Parma river in Colorno was selected to be permanently monitored. A customized ERT monitoring system using the Wenner array with 48 stainless steel plate electrodes was installed in November 2018. The system is making two measurements every day, sending the datasets to a Cloud platform through the mobile-phone network. Time-lapse analysis of datasets measured by the prototype and control measurements with commercial equipment show that the installed system is operating well. The research is in progress to define the thresholds of instability based on water saturation maps calculated from resistivity sections.
{"title":"Installation and validation of a customized resistivity system for permanent monitoring of a river embankment","authors":"A. Milano, D. Arosio, L. Longoni, M. Papini, Greta Tresoldi, L. Zanzi","doi":"10.3997/2214-4609.201900421","DOIUrl":"https://doi.org/10.3997/2214-4609.201900421","url":null,"abstract":"Development of early warning alarm systems for hydrogeological risk assessment is seriously under research in different European countries. In this paper, we discuss the installation and validation of a prototype electrical resistivity tomography (ERT) system for permanent monitoring of river levees. ERT measurements were performed on various candidate sections of river embankments in Lombardy and Emilia-Romagna regions in Italy for preliminary evaluation of critical sites to be monitored. Based on careful analysis of all datasets, a critical part along an earthen embankment of the Parma river in Colorno was selected to be permanently monitored. A customized ERT monitoring system using the Wenner array with 48 stainless steel plate electrodes was installed in November 2018. The system is making two measurements every day, sending the datasets to a Cloud platform through the mobile-phone network. Time-lapse analysis of datasets measured by the prototype and control measurements with commercial equipment show that the installed system is operating well. The research is in progress to define the thresholds of instability based on water saturation maps calculated from resistivity sections.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122145979","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 : 2019-04-24DOI: 10.3997/2214-4609.201900433
Chi‐Bao Le, T. Kieu, D. Pham, P. Lai
Summary Magnetotelluric (MT) method utilizes natural source from solar wind, thus its investigation depth can vary from a few hundred meters to kilometers or deeper depending on period measurement. MT is usually one of the main geophysical methods to explore deep structures, particularly conductive objects such as faults or geothermal reservoirs. MT inversion can result a conductivity model that may image fault zones or geothermal reservoirs. The MT 2D inversion likely produces distorted images because of 3D effects. Hence, the object can be imaged more robust by using 3D inversion. We applied 3D MT inversion to a dataset acquired in Quang Binh province, Vietnam for geothermal exploration. The dataset measured in nearly thirty stations is processed and exported to the impedance tensor format. We have investigated that the inverted conductivity distribution could provide three-dimensional vision of the fault system in this area.
{"title":"Inversion of 3D Magnetotelluric Data for Geothermal Exploration at Quang Binh Province, Vietnam","authors":"Chi‐Bao Le, T. Kieu, D. Pham, P. Lai","doi":"10.3997/2214-4609.201900433","DOIUrl":"https://doi.org/10.3997/2214-4609.201900433","url":null,"abstract":"Summary Magnetotelluric (MT) method utilizes natural source from solar wind, thus its investigation depth can vary from a few hundred meters to kilometers or deeper depending on period measurement. MT is usually one of the main geophysical methods to explore deep structures, particularly conductive objects such as faults or geothermal reservoirs. MT inversion can result a conductivity model that may image fault zones or geothermal reservoirs. The MT 2D inversion likely produces distorted images because of 3D effects. Hence, the object can be imaged more robust by using 3D inversion. We applied 3D MT inversion to a dataset acquired in Quang Binh province, Vietnam for geothermal exploration. The dataset measured in nearly thirty stations is processed and exported to the impedance tensor format. We have investigated that the inverted conductivity distribution could provide three-dimensional vision of the fault system in this area.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122244824","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 : 2019-04-24DOI: 10.3997/2214-4609.201900374
J. Ariffin, M. Ismail, M. Mohammadzaki
Summary Soft quaternary deposit is widely found in Seberang Prai Selatan, Penang which consist of marine clay, silt and few thin layer of sand. Due to actively development of the rural part, assessment of soil before substructure design is becoming top priority. This study aims to provide a reliable characterization as a guide for marine clay properties estimation using in situ data of one-dimensional shear wave velocity using Active-MASW, Passive-MASW and Hybrid-MASW. The lowest Vs30 observed from Active MASW method (111.59 m/s) while highest Vs30 observed to be from Hybrid MASW (173.60 m/s). In overall, result of Vs30 using Passive MASW is approximately similar to Hybrid MASW. Active MASW-Hybrid MASW relationship show weak correlation with R2=0.12 while for Passive MASW-Hybrid MASW show strong correlation with R2=0.91. Active MASW-Passive MASW are weak correlated with R2=0.106. Combination of these methods which is Hybrid MASW must be referred in order to obtain reliable Vs along subsurface depth.
{"title":"Characterization of Quaternary Deposit in Seberang Perai Selatan, Pulau Pinang Using Active, Passive and Hybrid MASW","authors":"J. Ariffin, M. Ismail, M. Mohammadzaki","doi":"10.3997/2214-4609.201900374","DOIUrl":"https://doi.org/10.3997/2214-4609.201900374","url":null,"abstract":"Summary Soft quaternary deposit is widely found in Seberang Prai Selatan, Penang which consist of marine clay, silt and few thin layer of sand. Due to actively development of the rural part, assessment of soil before substructure design is becoming top priority. This study aims to provide a reliable characterization as a guide for marine clay properties estimation using in situ data of one-dimensional shear wave velocity using Active-MASW, Passive-MASW and Hybrid-MASW. The lowest Vs30 observed from Active MASW method (111.59 m/s) while highest Vs30 observed to be from Hybrid MASW (173.60 m/s). In overall, result of Vs30 using Passive MASW is approximately similar to Hybrid MASW. Active MASW-Hybrid MASW relationship show weak correlation with R2=0.12 while for Passive MASW-Hybrid MASW show strong correlation with R2=0.91. Active MASW-Passive MASW are weak correlated with R2=0.106. Combination of these methods which is Hybrid MASW must be referred in order to obtain reliable Vs along subsurface depth.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133150855","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 : 2019-04-24DOI: 10.3997/2214-4609.201900415
C. Foss, C. Krapf, L. Katona, Philip Heath, R. Dutch, I. González-Álvarez
{"title":"Aeromagnetic anomaly mapping of possible heavy mineral accumulations in the Coompana area of South Australia","authors":"C. Foss, C. Krapf, L. Katona, Philip Heath, R. Dutch, I. González-Álvarez","doi":"10.3997/2214-4609.201900415","DOIUrl":"https://doi.org/10.3997/2214-4609.201900415","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125192339","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 : 2019-04-24DOI: 10.3997/2214-4609.201900382
L. Zanzi, Z. Zhang, D. Arosio, A. Hojat, M. Taruselli
Summary We are planning a tomographic survey to characterize an unstable rock mass that has been monitored with a microseismic sensor network since 2013. An automatic algorithm is used to classify the events filtering noise and interferences. To interpret the events for monitoring the evolution of the fracture system within the rock mass, we are now developing a hypocenter location procedure. The algorithm needs a 3D velocity model. In this work, we discuss the preliminary source tests performed on site to select a portable source suitable for the harsh environment and the size of the monitored area. The small database generated with these tests has been also used to perform a location exercise using a constant velocity. The results are encouraging but it is clear that a 3D velocity model is required to improve the accuracy. Finally, the database has been used to perform a tomographic exercise to extract a preliminary 3D velocity model. The result seems meaningful and shows that despite the difficulties in deploying and moving sources and sensors (a 24-geophone spread will be combined with the microseismic network to increase the ray coverage) in the harsh environment of the rock cliff, the tomographic survey is promising.
{"title":"Construction of a 3D velocity model for microseismic event location on a monitored rock slope","authors":"L. Zanzi, Z. Zhang, D. Arosio, A. Hojat, M. Taruselli","doi":"10.3997/2214-4609.201900382","DOIUrl":"https://doi.org/10.3997/2214-4609.201900382","url":null,"abstract":"Summary We are planning a tomographic survey to characterize an unstable rock mass that has been monitored with a microseismic sensor network since 2013. An automatic algorithm is used to classify the events filtering noise and interferences. To interpret the events for monitoring the evolution of the fracture system within the rock mass, we are now developing a hypocenter location procedure. The algorithm needs a 3D velocity model. In this work, we discuss the preliminary source tests performed on site to select a portable source suitable for the harsh environment and the size of the monitored area. The small database generated with these tests has been also used to perform a location exercise using a constant velocity. The results are encouraging but it is clear that a 3D velocity model is required to improve the accuracy. Finally, the database has been used to perform a tomographic exercise to extract a preliminary 3D velocity model. The result seems meaningful and shows that despite the difficulties in deploying and moving sources and sensors (a 24-geophone spread will be combined with the microseismic network to increase the ray coverage) in the harsh environment of the rock cliff, the tomographic survey is promising.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117320350","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 : 2019-04-24DOI: 10.3997/2214-4609.201900375
A. Konkov, A. Turchkov, A. Oshkin, V. Ignatev, I. Polikarpov, A. Simakov
Summary This paper is based on the results of shallow 2D seismic survey performed in the transition zone (land-shallow water) at the construction site of a bridge between mainland and Sakhalin Island (Eastern Russia). The purpose of the research was to obtain geological sections in the transition zone, that are necessary for further linking of marine and land seismic data. A special attention was given to assumptions on location of the upper boundary of a rocky base.
{"title":"Near-surface 2D seismic survey in the transition zone near Sakhalin island: case study","authors":"A. Konkov, A. Turchkov, A. Oshkin, V. Ignatev, I. Polikarpov, A. Simakov","doi":"10.3997/2214-4609.201900375","DOIUrl":"https://doi.org/10.3997/2214-4609.201900375","url":null,"abstract":"Summary This paper is based on the results of shallow 2D seismic survey performed in the transition zone (land-shallow water) at the construction site of a bridge between mainland and Sakhalin Island (Eastern Russia). The purpose of the research was to obtain geological sections in the transition zone, that are necessary for further linking of marine and land seismic data. A special attention was given to assumptions on location of the upper boundary of a rocky base.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132339485","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 : 2019-04-24DOI: 10.3997/2214-4609.201900407
Nadji Khattab
{"title":"Sedimentology of Semanggol Formation at Pokok Sena, Kedah","authors":"Nadji Khattab","doi":"10.3997/2214-4609.201900407","DOIUrl":"https://doi.org/10.3997/2214-4609.201900407","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117033274","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 : 2019-04-24DOI: 10.3997/2214-4609.201900425
V. Kaminski, E. Taikulakov, E. Janseitov, A. Daraev, J. Rudd, C. Thibaud
{"title":"Integration of airborne (SkyTEM) and ground (Dias) large-volume electrical survey data for delineation of new deposits","authors":"V. Kaminski, E. Taikulakov, E. Janseitov, A. Daraev, J. Rudd, C. Thibaud","doi":"10.3997/2214-4609.201900425","DOIUrl":"https://doi.org/10.3997/2214-4609.201900425","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125940926","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 : 2019-04-24DOI: 10.3997/2214-4609.201900446
G. Zhang, T. Chen
{"title":"Geological evaluation of density structure using the multi-level inversion of gravitational data in central Yili Basin","authors":"G. Zhang, T. Chen","doi":"10.3997/2214-4609.201900446","DOIUrl":"https://doi.org/10.3997/2214-4609.201900446","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124677464","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 : 2019-04-24DOI: 10.3997/2214-4609.201900413
Faisal Fadzil, N. Mustaza, Y. J. Teoh
{"title":"Characterization of Dolostone and Limestone in Perlis by Using X-Ray Powder","authors":"Faisal Fadzil, N. Mustaza, Y. J. Teoh","doi":"10.3997/2214-4609.201900413","DOIUrl":"https://doi.org/10.3997/2214-4609.201900413","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133107179","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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