This article presents a research study of complex limestone karst engineering-geological conditions in the municipality Valaskanear Banska Bystrica in Slovakia.The aim of the study is to demonstrate the impossibility ...This article presents a research study of complex limestone karst engineering-geological conditions in the municipality Valaskanear Banska Bystrica in Slovakia.The aim of the study is to demonstrate the impossibility of spatial identification of cave spaces using surface geophysical methods due to the specific engineering-geological conditions of a thick surface layer of anthropogenic fill containing highly heterogeneous anthropogenic material.Its maximum thickness is 3 m.Another specificific condition of the study area is its location in the built-up area,due to which the applicability of geophysical methods was limited.The article contains methodological recommendations to be used in analogous geological conditions with karst structures topped with anthropogenic fill,which complicates the identification of cave spaces.The recommended solution herein is the identification of the cave system using underground mapping of the karst and its projection onto the surface for which surface geophysical methods have been combined.展开更多
Mineral exploration is done by different methods. Geophysical and geochemical studies are two powerful tools in this field. In integrated studies, the results of each study are used to determine the location of the dr...Mineral exploration is done by different methods. Geophysical and geochemical studies are two powerful tools in this field. In integrated studies, the results of each study are used to determine the location of the drilling boreholes. The purpose of this study is to use field geophysics to calculate the depth of mineral reserve. The study area is located 38 km from Zarand city called Jalalabad iron mine. In this study, gravimetric data were measured and mineral depth was calculated using the Euler method. 1314 readings have been performed in this area. The rocks of the region include volcanic and sedimentary. The source of the mineralization in the area is hydrothermal processes. After gravity measuring in the region, the data were corrected, then various methods such as anomalous map remaining in levels one and two, upward expansion, first and second-degree vertical derivatives, analytical method, and analytical signal were drawn, and finally, the depth of the deposit was estimated by Euler method. As a result, the depth of the mineral deposit was calculated to be between 20 and 30 meters on average.展开更多
Integrating various data sets to provide one optimal subsurface image is a major goal of geophysicst. In this paper, there is a synergetic approach used to delineate the tectonic-structural framework with analyzing th...Integrating various data sets to provide one optimal subsurface image is a major goal of geophysicst. In this paper, there is a synergetic approach used to delineate the tectonic-structural framework with analyzing the hydrocarbon reservoir in the Lower Indus Platform basin of Pakistan. The reflected seismic profiles and potential field map constitute the data base of this study. Our study in the line of the previous research is resulted from important oil and gas discoveries contained in the Early Cretaceous and Upper Jurassic formations of the Lower Indus Platform basin area. The result shows trapping mechanism in the Lower Indus Platform basin involves of the fault blocks and stratigraphic traps are present in the area. The more refined images are interpreted to provide greater insight into detailed integrated geophysical study of area.展开更多
The Alborz Range,northern Iran,is a chain of mountains along the southern side of the Caspian Sea.This mountain range shows strong tectonic activity with several destructive earthquakes in the past.The range is tecton...The Alborz Range,northern Iran,is a chain of mountains along the southern side of the Caspian Sea.This mountain range shows strong tectonic activity with several destructive earthquakes in the past.The range is tectonically active,and the seismicity record shows both range-parallel left-lateral and thrust faulting.Tehran the capital of Iran and one of the largest cities in the world is located in the foothill of the Alborz Mountains,which is at risk of seismic hazard.This study is mainly focused on a scarp that passes by west of the Qarchak(a suburb in south east of Tehran)and therefore it is called the West Qarchak Fault.So,geological and geophysical surveying method was applied to study the West Qarchak Fault which is continuous and reaches to Pishva Fault in south east(with same trend)and crosses the Kahrizak Fault in the north west.In conclusion,it can be seen that apparently the geometry of the West Qarchak Fault is normal but the real mechanism is reverse(based on subsurface investigation).Morphologically,the Kahrizak Fault scarp has some similarity to the West Qarchak fault and it can be said that the geometry and mechanism of the Kahrizak Fault is same as the West Qarchak Fault,but requires a more detailed study.展开更多
A magnetotelluric study was carried out in the Xuefeng mountain uplift belt and its western margins. A detailed investigation was made of the resistivity of the formations, and reliable data were obtained. The sedimen...A magnetotelluric study was carried out in the Xuefeng mountain uplift belt and its western margins. A detailed investigation was made of the resistivity of the formations, and reliable data were obtained. The sedimentary cover and basement structure of the Xuefeng mountain area and the deep geological structure were analyzed in detail using magnetotelluric data from the twodimensional inversion of the resistivity profile data in combination with regional gravity and magnetic data. It was concluded that the tectonic movements were characterized by basement detachment, and north-south ramp.The study area can be divided into a southern uplift zone, a southern thrust-faulted zone, a central uplift zone, and a northern depression zone. This work has provided geophysical evidence that can be used in future studies of the tectonics and petroleum geology of this region.展开更多
The use of geomagnetic for geophysical and geological studies is a new method for receiving different information from new and old faults and lineaments. Accordingly, the present study is applied research and it use c...The use of geomagnetic for geophysical and geological studies is a new method for receiving different information from new and old faults and lineaments. Accordingly, the present study is applied research and it use combined the two methods, analytical signal and Euler’s combined method and invented a new combined method to estimate the depth, location and shape of the magnetic and gravity sources. As a case, this research selected Iran’s Zagros zone. This region due to the geological dynamics is considered by many geologists. In this regard, the 1:250,000 framework of Haji Abad was selected as a case study because of its convenient location for structural analysis. As a result, with airborne magnetic images survey, and applying filters in the vertical derivative and analytical signal, lineaments in depth of this region discovered and investigated.展开更多
Groundwater studies related to tropical islands inMalaysia are briefly reviewed.Perspectives areaddressed as three aspects:(a)study location,wheregroundwater studies in Malaysia are conducted indifferent types of trop...Groundwater studies related to tropical islands inMalaysia are briefly reviewed.Perspectives areaddressed as three aspects:(a)study location,wheregroundwater studies in Malaysia are conducted indifferent types of tropical islands(b)methods,namelynumerical modeling,geophysical investigations,hydrochemical analysis and geochemical modeling wereapplied in the studies of groundwater where numericalmodeling is the most used method in groundwater studiesof Malaysian coastal environment and tropical islands;(c)types of studies,where most of groundwater studiesare more focused in investigating the groundwaterresources and management as well as seawater intrusionusing numerical models and geophysical investigations.This review revealed that main objectives in most ofMalaysian groundwater studies in tropical islands aregroundwater resources,management as well asmechanism and processes of seawater intrusionphenomenon.This showed that groundwater studies inMalaysia focusing in tropical islands are clearly neededto be increased and strategized in terms of researchobjectives.Based on previous studies,future studiesshould give a focus in other types of investigations inutilization of this resource in order to fill in the knowledgegap of groundwater to provide clear direction insustainable development of this precious resource.展开更多
基金the support of the project(SP2017/22)which is the base of this articlepartially supported by the Slovak Research and Development Agency under contract No.APVV-0129-12the Scientific Grant Agency of the Ministry of Education,Science,Research and Sport of the Slovak Republic and the Slovak Academy of Sciences(VEGA)within the project No.1/0559/17 and APVV 1/0462/16。
文摘This article presents a research study of complex limestone karst engineering-geological conditions in the municipality Valaskanear Banska Bystrica in Slovakia.The aim of the study is to demonstrate the impossibility of spatial identification of cave spaces using surface geophysical methods due to the specific engineering-geological conditions of a thick surface layer of anthropogenic fill containing highly heterogeneous anthropogenic material.Its maximum thickness is 3 m.Another specificific condition of the study area is its location in the built-up area,due to which the applicability of geophysical methods was limited.The article contains methodological recommendations to be used in analogous geological conditions with karst structures topped with anthropogenic fill,which complicates the identification of cave spaces.The recommended solution herein is the identification of the cave system using underground mapping of the karst and its projection onto the surface for which surface geophysical methods have been combined.
文摘Mineral exploration is done by different methods. Geophysical and geochemical studies are two powerful tools in this field. In integrated studies, the results of each study are used to determine the location of the drilling boreholes. The purpose of this study is to use field geophysics to calculate the depth of mineral reserve. The study area is located 38 km from Zarand city called Jalalabad iron mine. In this study, gravimetric data were measured and mineral depth was calculated using the Euler method. 1314 readings have been performed in this area. The rocks of the region include volcanic and sedimentary. The source of the mineralization in the area is hydrothermal processes. After gravity measuring in the region, the data were corrected, then various methods such as anomalous map remaining in levels one and two, upward expansion, first and second-degree vertical derivatives, analytical method, and analytical signal were drawn, and finally, the depth of the deposit was estimated by Euler method. As a result, the depth of the mineral deposit was calculated to be between 20 and 30 meters on average.
文摘Integrating various data sets to provide one optimal subsurface image is a major goal of geophysicst. In this paper, there is a synergetic approach used to delineate the tectonic-structural framework with analyzing the hydrocarbon reservoir in the Lower Indus Platform basin of Pakistan. The reflected seismic profiles and potential field map constitute the data base of this study. Our study in the line of the previous research is resulted from important oil and gas discoveries contained in the Early Cretaceous and Upper Jurassic formations of the Lower Indus Platform basin area. The result shows trapping mechanism in the Lower Indus Platform basin involves of the fault blocks and stratigraphic traps are present in the area. The more refined images are interpreted to provide greater insight into detailed integrated geophysical study of area.
文摘The Alborz Range,northern Iran,is a chain of mountains along the southern side of the Caspian Sea.This mountain range shows strong tectonic activity with several destructive earthquakes in the past.The range is tectonically active,and the seismicity record shows both range-parallel left-lateral and thrust faulting.Tehran the capital of Iran and one of the largest cities in the world is located in the foothill of the Alborz Mountains,which is at risk of seismic hazard.This study is mainly focused on a scarp that passes by west of the Qarchak(a suburb in south east of Tehran)and therefore it is called the West Qarchak Fault.So,geological and geophysical surveying method was applied to study the West Qarchak Fault which is continuous and reaches to Pishva Fault in south east(with same trend)and crosses the Kahrizak Fault in the north west.In conclusion,it can be seen that apparently the geometry of the West Qarchak Fault is normal but the real mechanism is reverse(based on subsurface investigation).Morphologically,the Kahrizak Fault scarp has some similarity to the West Qarchak fault and it can be said that the geometry and mechanism of the Kahrizak Fault is same as the West Qarchak Fault,but requires a more detailed study.
文摘A magnetotelluric study was carried out in the Xuefeng mountain uplift belt and its western margins. A detailed investigation was made of the resistivity of the formations, and reliable data were obtained. The sedimentary cover and basement structure of the Xuefeng mountain area and the deep geological structure were analyzed in detail using magnetotelluric data from the twodimensional inversion of the resistivity profile data in combination with regional gravity and magnetic data. It was concluded that the tectonic movements were characterized by basement detachment, and north-south ramp.The study area can be divided into a southern uplift zone, a southern thrust-faulted zone, a central uplift zone, and a northern depression zone. This work has provided geophysical evidence that can be used in future studies of the tectonics and petroleum geology of this region.
文摘The use of geomagnetic for geophysical and geological studies is a new method for receiving different information from new and old faults and lineaments. Accordingly, the present study is applied research and it use combined the two methods, analytical signal and Euler’s combined method and invented a new combined method to estimate the depth, location and shape of the magnetic and gravity sources. As a case, this research selected Iran’s Zagros zone. This region due to the geological dynamics is considered by many geologists. In this regard, the 1:250,000 framework of Haji Abad was selected as a case study because of its convenient location for structural analysis. As a result, with airborne magnetic images survey, and applying filters in the vertical derivative and analytical signal, lineaments in depth of this region discovered and investigated.
基金support by NationalScience Fellowship (NSF) Scholarship awarded by Ministry ofScience, Technology and Innovation (MOSTI), Malaysia for herdoctoral study.
文摘Groundwater studies related to tropical islands inMalaysia are briefly reviewed.Perspectives areaddressed as three aspects:(a)study location,wheregroundwater studies in Malaysia are conducted indifferent types of tropical islands(b)methods,namelynumerical modeling,geophysical investigations,hydrochemical analysis and geochemical modeling wereapplied in the studies of groundwater where numericalmodeling is the most used method in groundwater studiesof Malaysian coastal environment and tropical islands;(c)types of studies,where most of groundwater studiesare more focused in investigating the groundwaterresources and management as well as seawater intrusionusing numerical models and geophysical investigations.This review revealed that main objectives in most ofMalaysian groundwater studies in tropical islands aregroundwater resources,management as well asmechanism and processes of seawater intrusionphenomenon.This showed that groundwater studies inMalaysia focusing in tropical islands are clearly neededto be increased and strategized in terms of researchobjectives.Based on previous studies,future studiesshould give a focus in other types of investigations inutilization of this resource in order to fill in the knowledgegap of groundwater to provide clear direction insustainable development of this precious resource.
