Pub Date : 2023-01-01DOI: 10.17721/1728-2713.100.02
S. Aliyeva
The objective of this study is to establish links between the features of the geodynamic evolution of the complex, heterogeneous in its geological structure of the Caspian megadepression and adjacent regions – with the issues of assessing the prospects for the oil and gas potential of this entire territory. For this purpose, the data of published works on the geodynamic evolution of the above territory were analyzed and, based on this analysis, a summary map of the geodynamic evolution of the Caspian megadepression and adjacent regions was compiled, combined with the optimal systemic oil and gas geological zoning of this territory, previously developed by the authors of this work. The analysis of oil and gas resources for individual large links of the optimal zoning system with the features of their geodynamic evolution showed that in the studied area, there is mainly a direct dependence of the amount and density of hydrocarbon (HC) resources on the number of stages of geodynamic evolution of the earth's crust that have passed here, and also the presence or absence of paleospreading zones (rifts) and paleosubduction zones (island arcs).
{"title":"GEODYNAMIC EVOLUTION OF THE CASPIAN MEGADEPRESSION AND ADJACENT TERRITORIES","authors":"S. Aliyeva","doi":"10.17721/1728-2713.100.02","DOIUrl":"https://doi.org/10.17721/1728-2713.100.02","url":null,"abstract":"The objective of this study is to establish links between the features of the geodynamic evolution of the complex, heterogeneous in its geological structure of the Caspian megadepression and adjacent regions – with the issues of assessing the prospects for the oil and gas potential of this entire territory. For this purpose, the data of published works on the geodynamic evolution of the above territory were analyzed and, based on this analysis, a summary map of the geodynamic evolution of the Caspian megadepression and adjacent regions was compiled, combined with the optimal systemic oil and gas geological zoning of this territory, previously developed by the authors of this work. The analysis of oil and gas resources for individual large links of the optimal zoning system with the features of their geodynamic evolution showed that in the studied area, there is mainly a direct dependence of the amount and density of hydrocarbon (HC) resources on the number of stages of geodynamic evolution of the earth's crust that have passed here, and also the presence or absence of paleospreading zones (rifts) and paleosubduction zones (island arcs).","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83382470","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 : 2023-01-01DOI: 10.17721/1728-2713.100.15
S. Vyzhva, V. Zatserkovnyi, I. Zobniv, M. De Donatis, I. Tsiupa
In the work, the main fault of the Monte Nerone anticline (Marche – Northern Apennines) was investigated, as well as the study, identification and fixation of faults: the normal fault system in the Monte Nerone area and the search for correlations on the ground of the Monte Nerone fault with the earthquake in the Marche Apennines in 1781. A small-angle eastern normal fault dipping at a small angle in the structure of extensive deformations was interpreted, it was based on the seismic profiles of the crust. Therefore, seismic events registered in this tectonically active zone can be related to this fault, as, for example, recent events in the area of the southern UmbrianMarchean Apennines. The main local tectonic structure is an anticlinorium, oriented in NW-SW, corresponding to the regional Apennine depression, with a longitudinal extension of about 30 km and a wavelength of 5–6 km. The work on sounding the Monte Nerone main fault was developed in several stages: project preparation, terrain surveying, data processing and synthesis. The project included a CTR of the Marche region, a geodetic reference map based on the international ellipsoid centered on Monte Mario (Rome 1940), a geological map at a scale of 1:10 000 and satellite orthophoto plans of the reference areas. Reference layers were created in the work in the form of a shape file to be able to catalog and share the information obtained in the field. These layers included: metadata, data containing measurements, annotation. During the fieldwork, a route and stops were planned where more detailed measurements were made and played the role of landmarks for checking with previously obtained data to confirm or refute the hypothesis. In the route, nine main stops were selected, where reconnaissance of the territory was carried out, geological characteristics of the formation were determined, measurements and recording of the main fault, its direction, angles of dip and extension, slope were carried out. All measurements were recorded in the software environment and previously created database. Using a Bluetooth GPS connected to a tablet PC, accurate tracking of the position where the measurements were made was obtained. With the help of the measurements carried out, it was possible to put forward the hypothesis that the Monte Nero fault extends from the west, starting from La Valle, crossing the western, southern and eastern slopes of Monte Nerone and extending to Monte La Montagnola, continuing to Pietralunga on its entire along the length of about 9.9 km. In addition, having the CTR with the geological map, we were able to confirm certain geological deposits. A 3D terrain model was created in ArcScene software to fully account for the terrain situation. The topography of the area was modeled in relation to the geological situation, the fault was marked, and the collected data were interpreted. Given the 54° dip, 90° inclination of the rocks we measured along the route, it can be assumed tha
{"title":"APPLICATION OF GEO-INFORMATION TECHNOLOGIES IN DETERMINING THE DEPTH OF EARTHQUAKE IN THE MONTE NERONE DISTRICT (MARCHE DISTRICT, NOTHERN APENNINES IN 1781)","authors":"S. Vyzhva, V. Zatserkovnyi, I. Zobniv, M. De Donatis, I. Tsiupa","doi":"10.17721/1728-2713.100.15","DOIUrl":"https://doi.org/10.17721/1728-2713.100.15","url":null,"abstract":"In the work, the main fault of the Monte Nerone anticline (Marche – Northern Apennines) was investigated, as well as the study, identification and fixation of faults: the normal fault system in the Monte Nerone area and the search for correlations on the ground of the Monte Nerone fault with the earthquake in the Marche Apennines in 1781. A small-angle eastern normal fault dipping at a small angle in the structure of extensive deformations was interpreted, it was based on the seismic profiles of the crust. Therefore, seismic events registered in this tectonically active zone can be related to this fault, as, for example, recent events in the area of the southern UmbrianMarchean Apennines. The main local tectonic structure is an anticlinorium, oriented in NW-SW, corresponding to the regional Apennine depression, with a longitudinal extension of about 30 km and a wavelength of 5–6 km. The work on sounding the Monte Nerone main fault was developed in several stages: project preparation, terrain surveying, data processing and synthesis. The project included a CTR of the Marche region, a geodetic reference map based on the international ellipsoid centered on Monte Mario (Rome 1940), a geological map at a scale of 1:10 000 and satellite orthophoto plans of the reference areas. Reference layers were created in the work in the form of a shape file to be able to catalog and share the information obtained in the field. These layers included: metadata, data containing measurements, annotation. During the fieldwork, a route and stops were planned where more detailed measurements were made and played the role of landmarks for checking with previously obtained data to confirm or refute the hypothesis. In the route, nine main stops were selected, where reconnaissance of the territory was carried out, geological characteristics of the formation were determined, measurements and recording of the main fault, its direction, angles of dip and extension, slope were carried out. All measurements were recorded in the software environment and previously created database. Using a Bluetooth GPS connected to a tablet PC, accurate tracking of the position where the measurements were made was obtained. With the help of the measurements carried out, it was possible to put forward the hypothesis that the Monte Nero fault extends from the west, starting from La Valle, crossing the western, southern and eastern slopes of Monte Nerone and extending to Monte La Montagnola, continuing to Pietralunga on its entire along the length of about 9.9 km. In addition, having the CTR with the geological map, we were able to confirm certain geological deposits. A 3D terrain model was created in ArcScene software to fully account for the terrain situation. The topography of the area was modeled in relation to the geological situation, the fault was marked, and the collected data were interpreted. Given the 54° dip, 90° inclination of the rocks we measured along the route, it can be assumed tha","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87059491","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 : 2023-01-01DOI: 10.17721/1728-2713.100.08
V. Yemets, I. Bezrodna, V. Antoniuk
The paper discusses the details of the application of the method of fluid substitution which is used for predicting elastic properties of reservoir rocks and their dependence on pore fluid and porosity. This method makes it possible to predict changes in elastic response of a rock saturation with different fluids. The main task of this paper was to study the productive zones of the visean deposits of the Yablunivske field using the example of a single well. The integration of petrophysics and rock physics (Gassmann fluid substitution) was applied to sandstones with intergranular porosity. The objective of the study was to use petrophysical dependences, cross-plots and Gassmann fluid substitution modelling to determine the effect of different pore fluids (brine, oil, gas) on acoustic properties (compressional velocity, shear velocity, density). It was established that the sandstone is a predominant type of reservoir of the considered rocks. The effect of fluid substitution on elastic properties was determined as a result of the implementation of Gasman's technique. The compressional velocity and density decreased, shear velocity slightly increased when brine was substituted with gas for the formed models. Limit values of acoustic impedance and Vp/Vs have been established for the water saturated and hydrocarbon saturated strata of the V-20 – V-22 horizons. It can be used for the drilling new wells of the Yablunivske field creating elastic reservoir rock models.
{"title":"MODELLING OF THE EFFECTS OF FLUID SUBSTITUTION IN THE VISEAN DEPOSITS OF THE YABLUNIVSKE FIELD BASED ON THE INTERPRETATION OF WELL LOGGING DATA AND PETROPHYSICS","authors":"V. Yemets, I. Bezrodna, V. Antoniuk","doi":"10.17721/1728-2713.100.08","DOIUrl":"https://doi.org/10.17721/1728-2713.100.08","url":null,"abstract":"The paper discusses the details of the application of the method of fluid substitution which is used for predicting elastic properties of reservoir rocks and their dependence on pore fluid and porosity. This method makes it possible to predict changes in elastic response of a rock saturation with different fluids. The main task of this paper was to study the productive zones of the visean deposits of the Yablunivske field using the example of a single well. The integration of petrophysics and rock physics (Gassmann fluid substitution) was applied to sandstones with intergranular porosity. The objective of the study was to use petrophysical dependences, cross-plots and Gassmann fluid substitution modelling to determine the effect of different pore fluids (brine, oil, gas) on acoustic properties (compressional velocity, shear velocity, density). It was established that the sandstone is a predominant type of reservoir of the considered rocks. The effect of fluid substitution on elastic properties was determined as a result of the implementation of Gasman's technique. The compressional velocity and density decreased, shear velocity slightly increased when brine was substituted with gas for the formed models. Limit values of acoustic impedance and Vp/Vs have been established for the water saturated and hydrocarbon saturated strata of the V-20 – V-22 horizons. It can be used for the drilling new wells of the Yablunivske field creating elastic reservoir rock models.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83333696","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 : 2022-01-01DOI: 10.17721/1728-2713.98.01
O. Mytrokhyn, V. Bakhmutov, L. Gavryliv
The second part of the work "Intrusive-magmatic complexes of Wilhelm Archupelago, West Antarctica" is devoted to dykes. The authors studied dyke rocks in the Ukrainian Antarctic Station area in order to specify their petrographic diversity as well as to clarify the spatial distribution of the dykes, their geological position, age and geological relationships with other igneous formations in the region. It was found that hypabyssal and subvolcanic dykes of the Mesozoic-Cenozoic age are widespread on the Wilhelm Archipelago. The most common composition are mafic and intermediate rocks namely microgabbros, diabases, basalts and microdiorites. Felsic dykes are subordinate. Typically, studied rocks occur as small dykes that can concentrate in extended swarms. Sill-like intrusions are less common. The spatial distribution of dykes is controlled by the Lemaer – Penola fault zone of northeastern strike. Their greatest concentration was found on the Argentine Islands. The geological relationships of the dykes with isotopically dated granitoids as well as the sequence of intrusion of individual dyke bodies, which is established in the places of their distribution, allowed to distinguish, at least, two stages of dyke formation - namely Mesozoic and Cenozoic. The most ancient dyke formations of the Argentine Islands are hypabyssal dykes and sill-like intrusions of the Mesozoic age. They intruded after the accumulation of the Jurassic-Cretaceous volcanic strata of the Argentine Islands, but before the formation of the Paleogene granitoids on the Barchans and Forge Islands. The petrographic diversity of Mesozoic dyke rocks is represented by microdiorites and microgabbros, as well as their contact-metamorphosed equivalents. All hypabyssal and subvolcanic dykes intruding the Paleogene granitoids on Barchans and Forge islands are of Cenozoic age. Among them, the most common are diabase and basalt dykes. Microdiorites are of subordinate importance. The characteristic petrographic features of the Cenozoic dykes allow to identify their age analogs outside of the Barchans-Forge granitoid intrusion.
{"title":"INTRUSIVE-MAGMATIC COMPLEXES OF WILHELM ARCHIPELAGO, WEST ANTARCTICA (PART 2 – HYPABYSSAL AND SUBVOLCANIC DYKE ROCKS)","authors":"O. Mytrokhyn, V. Bakhmutov, L. Gavryliv","doi":"10.17721/1728-2713.98.01","DOIUrl":"https://doi.org/10.17721/1728-2713.98.01","url":null,"abstract":"The second part of the work \"Intrusive-magmatic complexes of Wilhelm Archupelago, West Antarctica\" is devoted to dykes. The authors studied dyke rocks in the Ukrainian Antarctic Station area in order to specify their petrographic diversity as well as to clarify the spatial distribution of the dykes, their geological position, age and geological relationships with other igneous formations in the region. It was found that hypabyssal and subvolcanic dykes of the Mesozoic-Cenozoic age are widespread on the Wilhelm Archipelago. The most common composition are mafic and intermediate rocks namely microgabbros, diabases, basalts and microdiorites. Felsic dykes are subordinate. Typically, studied rocks occur as small dykes that can concentrate in extended swarms. Sill-like intrusions are less common. The spatial distribution of dykes is controlled by the Lemaer – Penola fault zone of northeastern strike. Their greatest concentration was found on the Argentine Islands. The geological relationships of the dykes with isotopically dated granitoids as well as the sequence of intrusion of individual dyke bodies, which is established in the places of their distribution, allowed to distinguish, at least, two stages of dyke formation - namely Mesozoic and Cenozoic. The most ancient dyke formations of the Argentine Islands are hypabyssal dykes and sill-like intrusions of the Mesozoic age. They intruded after the accumulation of the Jurassic-Cretaceous volcanic strata of the Argentine Islands, but before the formation of the Paleogene granitoids on the Barchans and Forge Islands. The petrographic diversity of Mesozoic dyke rocks is represented by microdiorites and microgabbros, as well as their contact-metamorphosed equivalents. All hypabyssal and subvolcanic dykes intruding the Paleogene granitoids on Barchans and Forge islands are of Cenozoic age. Among them, the most common are diabase and basalt dykes. Microdiorites are of subordinate importance. The characteristic petrographic features of the Cenozoic dykes allow to identify their age analogs outside of the Barchans-Forge granitoid intrusion.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85032951","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 : 2022-01-01DOI: 10.17721/1728-2713.99.03
S. Kravets, D. Malytskyy, О. Astashkina
The article is devoted to the elucidation of experimentally tested methods for correcting the frequency range, amplitudes and noise levels for seismic sensors. Increasing the level of sensitivity of the registration system in a certain frequency range allows flexibly and in a short time to study the timing of microearthquakes in different geological structures and assess seismic parameters, control the development of natural karst phenomena and man-made cracks and deformations. The method of expanding the limits of application of common seismic transmitters type SM-3 and (SM-3 KV) in the seismic channels of portable seismic stations used in Ukraine is presented to solve a number of problems of seismology in technogenic-loaded regions with a high level of industrial average daily noise components. The article presents some results of registration of seismic signals performed by the information collection system using additional corrected seismic sensors SM-3 with extended frequency range in the low frequency range of the spectrum 0.1–3 Hz, installed at Carp-Lviv-2.
{"title":"ACTUAL APPROACHES TO THE ADAPTATION OF SEISMIC SENSORS FOR THE MAN-CAUSED TERRITORIES","authors":"S. Kravets, D. Malytskyy, О. Astashkina","doi":"10.17721/1728-2713.99.03","DOIUrl":"https://doi.org/10.17721/1728-2713.99.03","url":null,"abstract":"The article is devoted to the elucidation of experimentally tested methods for correcting the frequency range, amplitudes and noise levels for seismic sensors. Increasing the level of sensitivity of the registration system in a certain frequency range allows flexibly and in a short time to study the timing of microearthquakes in different geological structures and assess seismic parameters, control the development of natural karst phenomena and man-made cracks and deformations. The method of expanding the limits of application of common seismic transmitters type SM-3 and (SM-3 KV) in the seismic channels of portable seismic stations used in Ukraine is presented to solve a number of problems of seismology in technogenic-loaded regions with a high level of industrial average daily noise components. The article presents some results of registration of seismic signals performed by the information collection system using additional corrected seismic sensors SM-3 with extended frequency range in the low frequency range of the spectrum 0.1–3 Hz, installed at Carp-Lviv-2.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83362707","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 : 2022-01-01DOI: 10.17721/1728-2713.97.12
Yu.V. Lytvynenko, O. Melnychenko, V. Kadoshnikov, V. Shkapenko
This article presents the possibility of usage of the archaeological glasses to predict the behavior of radionuclides incorporated into the glass matrix, under the conditions of the underground storage during prolonged contact with the groundwater. Archaeological glasses, whose age is more than two thousand years old, selected from the cultural horizon of the archaeological reserve "Olvia" were examined. A gel layer was formed on the surface of the glass prolonged contact with the soil, on the outer surface of which layered aluminosilicates are formed. The formation of a protective layer of the glass occurs by the mechanism of the incongruent dissolution. It has been experimentally established that alkaline and alkaline earth cations (Na, Ca), partially silicon and iron, are intensively removed into the soil during leaching from the glass, with the practical immobility of aluminum. Simulation of glass fracture was performed in Soxhlet extractors under conditions of continuous exposure to hot water (t = 75–80 °C) saturated with carbon dioxide for 6 months. The change in the rate of components removal from the glass is connected with an increase in the thickness of the "locking" gel layer, the thickness of which increases over time. Cyclic changes in the dissolution rate of the glass are connected with the partial destruction of the gel layer due to the increase in thickness of the gel layer and, accordingly, a decrease in the adhesion of the gel to the glass. The results of the aluminosilicate (archaeological) glasses fracture study and their comparison with the results of the borosilicate glasses fracture study indicate that archaeological glasses can be a model for the predicting of the behavior in natural conditions of the glass matrices intended for radioactive waste volume reduction for centuries.
{"title":"ARCHAEOLOGICAL GLASSES – A MODEL FOR THE STABILITY EVALUATION OF THE VITRIFIED RADIOACTIVE WASTE","authors":"Yu.V. Lytvynenko, O. Melnychenko, V. Kadoshnikov, V. Shkapenko","doi":"10.17721/1728-2713.97.12","DOIUrl":"https://doi.org/10.17721/1728-2713.97.12","url":null,"abstract":"This article presents the possibility of usage of the archaeological glasses to predict the behavior of radionuclides incorporated into the glass matrix, under the conditions of the underground storage during prolonged contact with the groundwater. Archaeological glasses, whose age is more than two thousand years old, selected from the cultural horizon of the archaeological reserve \"Olvia\" were examined. A gel layer was formed on the surface of the glass prolonged contact with the soil, on the outer surface of which layered aluminosilicates are formed. The formation of a protective layer of the glass occurs by the mechanism of the incongruent dissolution. It has been experimentally established that alkaline and alkaline earth cations (Na, Ca), partially silicon and iron, are intensively removed into the soil during leaching from the glass, with the practical immobility of aluminum. Simulation of glass fracture was performed in Soxhlet extractors under conditions of continuous exposure to hot water (t = 75–80 °C) saturated with carbon dioxide for 6 months. The change in the rate of components removal from the glass is connected with an increase in the thickness of the \"locking\" gel layer, the thickness of which increases over time. Cyclic changes in the dissolution rate of the glass are connected with the partial destruction of the gel layer due to the increase in thickness of the gel layer and, accordingly, a decrease in the adhesion of the gel to the glass. The results of the aluminosilicate (archaeological) glasses fracture study and their comparison with the results of the borosilicate glasses fracture study indicate that archaeological glasses can be a model for the predicting of the behavior in natural conditions of the glass matrices intended for radioactive waste volume reduction for centuries.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81933377","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 : 2022-01-01DOI: 10.17721/1728-2713.97.06
R. Piriyev
The Caspian Sea is the largest closed reservoir in the world. The strongest earthquake in the Caspian Sea was the 7.9 magnitude, the 1895 Krasnovodsk earthquake. The parameters of earthquakes with different magnitude in recent years in the Caspian Sea were analyzed and the characteristic depth was determined based on statistical data. Attempts to determine their periodicity and attempts to predict for the future have been made on the basis of statistical data of earthquakes occurred within the last 50 years in the Caspian Sea and surrounding regions. In the data taken from the earthquake catalog, parameters of earthquakes whose magnitude is above 5.0 were used. In recent years, earthquakes with a magnitude below 5.0 have been accompanied in the Caspian Sea. The characteristic depth of earthquakes is considered ±60 km. The probability of recurrence of an earthquake with a magnitude of 6.8 occurred in 2000 is likely to occur in 2050.
{"title":"PERIODICITY OF EARTHQUAKES IN THE CASPIAN SEA","authors":"R. Piriyev","doi":"10.17721/1728-2713.97.06","DOIUrl":"https://doi.org/10.17721/1728-2713.97.06","url":null,"abstract":"The Caspian Sea is the largest closed reservoir in the world. The strongest earthquake in the Caspian Sea was the 7.9 magnitude, the 1895 Krasnovodsk earthquake. The parameters of earthquakes with different magnitude in recent years in the Caspian Sea were analyzed and the characteristic depth was determined based on statistical data. Attempts to determine their periodicity and attempts to predict for the future have been made on the basis of statistical data of earthquakes occurred within the last 50 years in the Caspian Sea and surrounding regions. In the data taken from the earthquake catalog, parameters of earthquakes whose magnitude is above 5.0 were used. In recent years, earthquakes with a magnitude below 5.0 have been accompanied in the Caspian Sea. The characteristic depth of earthquakes is considered ±60 km. The probability of recurrence of an earthquake with a magnitude of 6.8 occurred in 2000 is likely to occur in 2050.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79521109","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 : 2022-01-01DOI: 10.17721/1728-2713.96.06
R. Piriyev
In order to make comparisons and find new perspectives in terms of electromagnetic phenomena in earthquake prediction, ULF range was chosen. For comparison, tables consisting of the results of studies from previous years and the last 10 years have been compiled. In order to find new perspectives, the graphs were drawn and comparative analysis was carried out on the basis of these results. It was concluded that the ULF precursors can be found before earthquakes reaching up to 30 km in depth, and it can be considered a promising effective range in detecting precursors of earthquakes. In addition, due to the connection between the epicenter distances and the depths of the earthquakes and their magnitudes, attempts to detect the precursors have been made so that the epicenter of the earthquakes is ±100km. The article also provides information about ULF networks and about researchers who had critical opinions on electromagnetic phenomena associated with earthquakes.
{"title":"REVIEW OF ELECTROMAGNETIC MONITORING STUDIES IN PREDICTING EARTHQUAKES: RECENT RESULTS AND NEW PERSPECTIVES","authors":"R. Piriyev","doi":"10.17721/1728-2713.96.06","DOIUrl":"https://doi.org/10.17721/1728-2713.96.06","url":null,"abstract":"In order to make comparisons and find new perspectives in terms of electromagnetic phenomena in earthquake prediction, ULF range was chosen. For comparison, tables consisting of the results of studies from previous years and the last 10 years have been compiled. In order to find new perspectives, the graphs were drawn and comparative analysis was carried out on the basis of these results. It was concluded that the ULF precursors can be found before earthquakes reaching up to 30 km in depth, and it can be considered a promising effective range in detecting precursors of earthquakes. In addition, due to the connection between the epicenter distances and the depths of the earthquakes and their magnitudes, attempts to detect the precursors have been made so that the epicenter of the earthquakes is ±100km. The article also provides information about ULF networks and about researchers who had critical opinions on electromagnetic phenomena associated with earthquakes.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79791510","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 : 2022-01-01DOI: 10.17721/1728-2713.96.03
O. Kendzera, S. Mykulyak, Y. Semenova, І. Skurativska, S. Skurativskyi
The paper is devoted to modeling of the seismic reaction of an inhomogeneous soil massif consisting of three layers that can incorporate oscillating inclusions. The description of the behavior of soil strata is carried out on the basis of the continual approach, within which the dynamics of the medium is determined by a system of equations of motion and equations of state, where the elastic or visco-elastic properties of the medium are indicated. Classical linear models are quite simple and well verified experimentally, but due to the complex structure of natural geomedia, these models cannot always adequately describe wave processes in them. This requires improvement of models in such a way as to take into account the internal structure of materials. In this paper, to describe the shear dynamics of an inhomogeneous soil massif, the equations of motion for a continuous medium in the form of mutually penetrating continua are used, one of which coincides with the Kelvin-Voigt carrier medium, and the other one is described by a set of noninteracting partial oscillators. Various inclusions, cracks, or cavities filled with gases and/or liquids can act as oscillators. The equations of motion are supplemented by the compatibility conditions at the boundaries of the layers. The set of layers is considered, among which only one contains oscillating inclusions. The one-dimensional boundary value problem with a free surface and the harmonic law of deformation of massif's rigid bedrock is solved. Using the exact solution of the boundary value problem, the amplification factor of strains for massifs with characteristics close to natural is calculated. Moreover, the iterative procedure, which makes it possible to write down the final formula for the amplification factor in the case of a layered medium with layers of more than 3 is developed. It is shown that the incorporation of inclusions in one of the layers leads to the appearance of an additional resonance frequency, a shift of resonances to the low-frequency region, the appearance of zones with significant damping of resonance peaks. The results obtained make it possible to improve the computational methods for determining the quantitative parameters of seismic hazard when work on seismic micro zoning of construction and operational sites in the seismic regions of Ukraine is carried out.
{"title":"RESONANT PROPERTIES OF LAYERED SOIL MASSIF CONTAINING A LAYER WITH OSCILLATING INCLUSIONS","authors":"O. Kendzera, S. Mykulyak, Y. Semenova, І. Skurativska, S. Skurativskyi","doi":"10.17721/1728-2713.96.03","DOIUrl":"https://doi.org/10.17721/1728-2713.96.03","url":null,"abstract":"The paper is devoted to modeling of the seismic reaction of an inhomogeneous soil massif consisting of three layers that can incorporate oscillating inclusions. The description of the behavior of soil strata is carried out on the basis of the continual approach, within which the dynamics of the medium is determined by a system of equations of motion and equations of state, where the elastic or visco-elastic properties of the medium are indicated. Classical linear models are quite simple and well verified experimentally, but due to the complex structure of natural geomedia, these models cannot always adequately describe wave processes in them. This requires improvement of models in such a way as to take into account the internal structure of materials. In this paper, to describe the shear dynamics of an inhomogeneous soil massif, the equations of motion for a continuous medium in the form of mutually penetrating continua are used, one of which coincides with the Kelvin-Voigt carrier medium, and the other one is described by a set of noninteracting partial oscillators. Various inclusions, cracks, or cavities filled with gases and/or liquids can act as oscillators. The equations of motion are supplemented by the compatibility conditions at the boundaries of the layers. The set of layers is considered, among which only one contains oscillating inclusions. The one-dimensional boundary value problem with a free surface and the harmonic law of deformation of massif's rigid bedrock is solved. Using the exact solution of the boundary value problem, the amplification factor of strains for massifs with characteristics close to natural is calculated. Moreover, the iterative procedure, which makes it possible to write down the final formula for the amplification factor in the case of a layered medium with layers of more than 3 is developed. It is shown that the incorporation of inclusions in one of the layers leads to the appearance of an additional resonance frequency, a shift of resonances to the low-frequency region, the appearance of zones with significant damping of resonance peaks. The results obtained make it possible to improve the computational methods for determining the quantitative parameters of seismic hazard when work on seismic micro zoning of construction and operational sites in the seismic regions of Ukraine is carried out.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83136090","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 : 2022-01-01DOI: 10.17721/1728-2713.99.02
K. Bondar, S. Vyzhva, I. Sheiko, R. Kozlenko
The article describes the history of the development of geophysical methods in archaeological studies in Europe, the USA, the former USSR and Ukraine. In the 1950s the researchers quickly proceeded from the first sampling to the mass magnetic and electric measurements. In the 1980s there was a transition to digital registration during field studies, as well as rapid development of data processing. This led to the introduction of some geophysical methods in archaeology, which require complex calculations when processing the signal and inversion of data, such as georadar method, electrical resistivity tomography, induction method, etc. At the current stage, there is a need to interpret these more and more detailed and largescale geophysical data in the context of the differentiation of more and more weak in contrast physical properties, and small-scale inhomogeneities in the soil cover. Confirmation of the anthropogenic and technogenic occurrence of geophysical anomalies is searched for using direct measurement and modeling of physical parameters of soil and archaeological materials. The work also presents the achievements of domestic geophysicists, as they became the basis for the great modern archeological projects and made the archeological geophysics the fundamental part of the cultural heritage research in Ukraine.
{"title":"ARCHAEOLOGICAL GEOPHYSICS IN THE WORLD AND IN UKRAINE: BEGINNING, DEVELOPMENT, PRESENT","authors":"K. Bondar, S. Vyzhva, I. Sheiko, R. Kozlenko","doi":"10.17721/1728-2713.99.02","DOIUrl":"https://doi.org/10.17721/1728-2713.99.02","url":null,"abstract":"The article describes the history of the development of geophysical methods in archaeological studies in Europe, the USA, the former USSR and Ukraine. In the 1950s the researchers quickly proceeded from the first sampling to the mass magnetic and electric measurements. In the 1980s there was a transition to digital registration during field studies, as well as rapid development of data processing. This led to the introduction of some geophysical methods in archaeology, which require complex calculations when processing the signal and inversion of data, such as georadar method, electrical resistivity tomography, induction method, etc. At the current stage, there is a need to interpret these more and more detailed and largescale geophysical data in the context of the differentiation of more and more weak in contrast physical properties, and small-scale inhomogeneities in the soil cover. Confirmation of the anthropogenic and technogenic occurrence of geophysical anomalies is searched for using direct measurement and modeling of physical parameters of soil and archaeological materials. The work also presents the achievements of domestic geophysicists, as they became the basis for the great modern archeological projects and made the archeological geophysics the fundamental part of the cultural heritage research in Ukraine.","PeriodicalId":42798,"journal":{"name":"Visnyk of Taras Shevchenko National University of Kyiv-Geology","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81568402","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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