Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900388
M. Azrief, M. Zakiran, M. N. Syakirah, S. Azwan, R. Noor, E. C. Lee, A. M. Hariri
Summary Over the past several decades there has been a steady increase in the application of geophysical technique to many type of civil engineering problems. Main applications included the determination of depth of bedrock and physical properties of rock (Sharma 1997). Recently, geophysical method has become the alternative method of soil investigation due to cost, time efficiencies, and the quality of their researches (Sam Setchell, 2016). In this case study, occurrence of crack at house structure due to soil settlement had become one of problematic issues in geotechnical investigation. With the support of geophysical method, the characteristic and soil category can be determined.
{"title":"Application of Geophysical Investigation to occurrence of settlement - A case study","authors":"M. Azrief, M. Zakiran, M. N. Syakirah, S. Azwan, R. Noor, E. C. Lee, A. M. Hariri","doi":"10.3997/2214-4609.201900388","DOIUrl":"https://doi.org/10.3997/2214-4609.201900388","url":null,"abstract":"Summary Over the past several decades there has been a steady increase in the application of geophysical technique to many type of civil engineering problems. Main applications included the determination of depth of bedrock and physical properties of rock (Sharma 1997). Recently, geophysical method has become the alternative method of soil investigation due to cost, time efficiencies, and the quality of their researches (Sam Setchell, 2016). In this case study, occurrence of crack at house structure due to soil settlement had become one of problematic issues in geotechnical investigation. With the support of geophysical method, the characteristic and soil category can be determined.","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":"124873102","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: 10.3997/2214-4609.201900438
S. H. Pandadaran, S. Pramono, M. Fadhilah, S. Kurniawan
{"title":"Ground motion prediction equation for West Sumatra based on shallow crustal, interface, and intraslab earthquakes","authors":"S. H. Pandadaran, S. Pramono, M. Fadhilah, S. Kurniawan","doi":"10.3997/2214-4609.201900438","DOIUrl":"https://doi.org/10.3997/2214-4609.201900438","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":"131590513","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: 10.3997/2214-4609.201900441
S. Nursarifa, M. Al Macky, A. U. Nafingah
{"title":"Identification of potential landslide areas in the Banten with GIS and rock compactness using the b value method","authors":"S. Nursarifa, M. Al Macky, A. U. Nafingah","doi":"10.3997/2214-4609.201900441","DOIUrl":"https://doi.org/10.3997/2214-4609.201900441","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":"131691418","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: 10.3997/2214-4609.201900389
M. Salah, Mohammad Alqudah, A. Monzer, C. David
Summary We conducted several petrophysical measurements on forty nine core samples collected from the Jurassic and Cretaceous strata exposed at west central Lebanon to evaluate their petrophysical and elastic properties and study the effects of the depositional conditions, sediment composition, and subsequent diagenetic processes on the measured parameters. First, these rocks were petrographically studied to identify the lithofacies, porosity, and the main diagenetic features. In addition, these rocks were investigated under the scanning electron microscope (SEM) and by the X-ray diffraction (XRD) analysis to identify their mineralogy. The petrophysical measurements were performed on the core samples where porosity, permeability, bulk and grain densities were first determined, followed by measuring the seismic wave velocities. The main lithofacies of these rocks can be categorized mainly into carbonates and siliciclastics. The SEM and XRD analyses revealed that the main constituting minerals are calcite, quartz, dolomite, beside other accessory minerals. The studied rocks have generally low to moderate porosity, moderate to high bulk density, and very low permeability. The average Vp and Vs are 4263, and 2323 m/s, respectively, giving a Vp/Vs ratio of 1.83. We further calculated the elastic moduli of the studied rocks and established a number of relationships between the measured petrophysical and acoustic properties to examine their mutual interdependence and evaluate the effects of porosity, rock composition, depositional and diagenetic processes on the measured rock characteristics. We found that some samples, mainly carbonates, deviate significantly from the expected porosity-velocity and density-velocity trends. It is thought that coring-induced microcracking, originally-present micro- and intercrystalline pores in these carbonate rocks may account for these outliers.
{"title":"Petrophysical and Geotechnical Evaluation of Mesozoic Rocks from Central Lebanon","authors":"M. Salah, Mohammad Alqudah, A. Monzer, C. David","doi":"10.3997/2214-4609.201900389","DOIUrl":"https://doi.org/10.3997/2214-4609.201900389","url":null,"abstract":"Summary We conducted several petrophysical measurements on forty nine core samples collected from the Jurassic and Cretaceous strata exposed at west central Lebanon to evaluate their petrophysical and elastic properties and study the effects of the depositional conditions, sediment composition, and subsequent diagenetic processes on the measured parameters. First, these rocks were petrographically studied to identify the lithofacies, porosity, and the main diagenetic features. In addition, these rocks were investigated under the scanning electron microscope (SEM) and by the X-ray diffraction (XRD) analysis to identify their mineralogy. The petrophysical measurements were performed on the core samples where porosity, permeability, bulk and grain densities were first determined, followed by measuring the seismic wave velocities. The main lithofacies of these rocks can be categorized mainly into carbonates and siliciclastics. The SEM and XRD analyses revealed that the main constituting minerals are calcite, quartz, dolomite, beside other accessory minerals. The studied rocks have generally low to moderate porosity, moderate to high bulk density, and very low permeability. The average Vp and Vs are 4263, and 2323 m/s, respectively, giving a Vp/Vs ratio of 1.83. We further calculated the elastic moduli of the studied rocks and established a number of relationships between the measured petrophysical and acoustic properties to examine their mutual interdependence and evaluate the effects of porosity, rock composition, depositional and diagenetic processes on the measured rock characteristics. We found that some samples, mainly carbonates, deviate significantly from the expected porosity-velocity and density-velocity trends. It is thought that coring-induced microcracking, originally-present micro- and intercrystalline pores in these carbonate rocks may account for these outliers.","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":"121054765","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: 10.3997/2214-4609.201900400
K. Tseedulam, S. Khishigsuren, Y. Bolormaa
{"title":"2D ERT for the investigation of the subsurface structures at the Egiin gol site, Northern Mongolia","authors":"K. Tseedulam, S. Khishigsuren, Y. Bolormaa","doi":"10.3997/2214-4609.201900400","DOIUrl":"https://doi.org/10.3997/2214-4609.201900400","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":"129776283","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: 10.3997/2214-4609.201900403
N. M. Sơn, P. Giao, S. Virdis
Summary Construction of the Urban Mass Rapid Transit (UMRT) lines in Hanoi have been considered since the 90s of the last century, and it starts to be conducted now to meet the increasing transport demands of the people living in this capital city of Vietnam. There is a concern that whether or not land subsidence due to groundwater extraction would affect the UMRT lines. Besides the conventional monitoring of subsidence, newer methods using satellite images such as DInSAR should be considered and applied. One of the limitations of DInSAR application is effect of decorrelation noises on quality of Interferograms. In this paper, the factors that may affect the DInSAR results were discussed, including general decorrelation noise and the selection of reference point. A case study for Hanoi city was conducted by two methods; DInSAR and one-dimensional finite element (FEM) consolidation analysis, to estimate the subsidence rate along the UMRT line No. 2. The results of this study showed a good match and consistency in the results obtained by these two methods. Consequently DInSAR is recommended for further land subsidence analysis for other targets in the urban area of Hanoi.
{"title":"DInSAR-based estimation of subsidence rate along an UMRT line in Hanoi","authors":"N. M. Sơn, P. Giao, S. Virdis","doi":"10.3997/2214-4609.201900403","DOIUrl":"https://doi.org/10.3997/2214-4609.201900403","url":null,"abstract":"Summary Construction of the Urban Mass Rapid Transit (UMRT) lines in Hanoi have been considered since the 90s of the last century, and it starts to be conducted now to meet the increasing transport demands of the people living in this capital city of Vietnam. There is a concern that whether or not land subsidence due to groundwater extraction would affect the UMRT lines. Besides the conventional monitoring of subsidence, newer methods using satellite images such as DInSAR should be considered and applied. One of the limitations of DInSAR application is effect of decorrelation noises on quality of Interferograms. In this paper, the factors that may affect the DInSAR results were discussed, including general decorrelation noise and the selection of reference point. A case study for Hanoi city was conducted by two methods; DInSAR and one-dimensional finite element (FEM) consolidation analysis, to estimate the subsidence rate along the UMRT line No. 2. The results of this study showed a good match and consistency in the results obtained by these two methods. Consequently DInSAR is recommended for further land subsidence analysis for other targets in the urban area of Hanoi.","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":"132436603","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: 10.3997/2214-4609.201900440
N. Wang, S. Y. Liu
{"title":"Application of Airborne Gamma Spectrometry in Radioactive Contamination Investigation of Baiyan Obo Rare Earth Mine","authors":"N. Wang, S. Y. Liu","doi":"10.3997/2214-4609.201900440","DOIUrl":"https://doi.org/10.3997/2214-4609.201900440","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":"132843227","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: 10.3997/2214-4609.201900391
H. Tang, L. Guo
Summary Southwest China has well-developed geothermal resources due to the complete and intense geotectonic activities. Heat flow is an important geophysical property to represent thermal state of the earth and it is closely related to the Curie depth. Most previous studies are mainly based on estimation of heat flow from the Curie depth. To improve the quality and accuracy of heat flow, we propose an iteration approach of calculating the heterogeneous thermal conductivity laterally. Firstly, we calculate the distribution of surface heat production using the data of radioactive elements. Secondly, the thermal conductivity is obtained under the constraint of the Curie depth and surface heat production. Finally, the heat flow and its value underground of the study area can be obtained. The results show that the surface heat flow of southwest China is in line with the background trend of high in the southwest and low in the northeast. The surface heat flow are basically corresponding to the measured heat flow and regional geothermal anomaly.
{"title":"Heat flow distribution in southwest China calculated from the Curie depth","authors":"H. Tang, L. Guo","doi":"10.3997/2214-4609.201900391","DOIUrl":"https://doi.org/10.3997/2214-4609.201900391","url":null,"abstract":"Summary Southwest China has well-developed geothermal resources due to the complete and intense geotectonic activities. Heat flow is an important geophysical property to represent thermal state of the earth and it is closely related to the Curie depth. Most previous studies are mainly based on estimation of heat flow from the Curie depth. To improve the quality and accuracy of heat flow, we propose an iteration approach of calculating the heterogeneous thermal conductivity laterally. Firstly, we calculate the distribution of surface heat production using the data of radioactive elements. Secondly, the thermal conductivity is obtained under the constraint of the Curie depth and surface heat production. Finally, the heat flow and its value underground of the study area can be obtained. The results show that the surface heat flow of southwest China is in line with the background trend of high in the southwest and low in the northeast. The surface heat flow are basically corresponding to the measured heat flow and regional geothermal anomaly.","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":"133043035","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: 10.3997/2214-4609.201900397
M. Brook
Summary The undulating topography of the Auckland urban region of New Zealand is susceptible to landslides of varying process-mechanisms, including: (1) earthflows of saturated Pleistocene Tauranga Group sediments, tephra and residual soils flowing off more competent underlying rock; (2) rotational slumping of man-made fill or Tauranga Group sediments; (3) block-slides of weak Miocene Waitemata Group sedimentary rock, dipping out of slope. Such landslides are often triggered by intense short periods, or prolonged periods of rainfall, such as the ‘Tasman Tempest’ and ex-Tropical Cyclone Debbie storms of 2017. Typically, rainfall infiltration results in a rise of the groundwater table and an increase of the pore water pressure, causing a reduction in effective normal stress and thereby soil strength, leading to landslides. Here, some case studies are presented of landslide investigations in Auckland using geophysics such as ERT and EM to monitor subsurface hydrogeology, in conjunction with Unmanned Aerial Vehicles (UAV) to monitor topographic change.
{"title":"Engineering geological investigations of landslides in Auckland, New Zealand","authors":"M. Brook","doi":"10.3997/2214-4609.201900397","DOIUrl":"https://doi.org/10.3997/2214-4609.201900397","url":null,"abstract":"Summary The undulating topography of the Auckland urban region of New Zealand is susceptible to landslides of varying process-mechanisms, including: (1) earthflows of saturated Pleistocene Tauranga Group sediments, tephra and residual soils flowing off more competent underlying rock; (2) rotational slumping of man-made fill or Tauranga Group sediments; (3) block-slides of weak Miocene Waitemata Group sedimentary rock, dipping out of slope. Such landslides are often triggered by intense short periods, or prolonged periods of rainfall, such as the ‘Tasman Tempest’ and ex-Tropical Cyclone Debbie storms of 2017. Typically, rainfall infiltration results in a rise of the groundwater table and an increase of the pore water pressure, causing a reduction in effective normal stress and thereby soil strength, leading to landslides. Here, some case studies are presented of landslide investigations in Auckland using geophysics such as ERT and EM to monitor subsurface hydrogeology, in conjunction with Unmanned Aerial Vehicles (UAV) to monitor topographic change.","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":"125836897","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: 10.3997/2214-4609.201900436
Xiaojun Meng, S. Li, J. Wang
{"title":"A novel constrained approach for improving the precision of downward continuation of potential field data","authors":"Xiaojun Meng, S. Li, J. Wang","doi":"10.3997/2214-4609.201900436","DOIUrl":"https://doi.org/10.3997/2214-4609.201900436","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":"125478185","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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