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11th Congress of the Balkan Geophysical Society
- Conference date: October 10-14, 2021
- Location: Online
- Published: 10 October 2021
81 - 86 of 86 results
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Radar Interferometric Assessment of April 18, 2021 Bandar Ganaveh Earthquake (mw: 5.8), Southern Iran
Authors M. Tourani, V. Isik, R. Saber and A. CaglayanSummaryInterferometric Synthetic Aperture Radar (InSAR) data have shown their potential for studying moderate-size earthquake events. The InSAR approach detects surface displacements in the LOS direction between satellite acquisitions before and after an earthquake and is used to extract earthquake fault parameters. The Zagros Mountains mark the western and southwest sides of the Iranian Plateau and accommodate the total shortening between Central Iran and Arabia by involving active folding and thrust faulting parallel to the belt. April 18, 2021, the Bandar Ganaveh earthquake (Mw: 5.8) originated at a relatively shallow depth of approximately 9–20 km and produced a strong ground shake that mainly affected the Bushehr province and its surroundings with moderate to low damages in buildings of rural areas.
The interferograms obtained from our InSAR analysis reveal significant surface deformation in the absence of clear signals of surface rupture. Interferogram patterns are also consistent with the orientation of the Zagros Mountain Front Fault. The retrieved InSAR displacement map indicates the maximum positive displacement value or uplift of 18 cm and the maximum negative displacement value or subsidence of 17 cm in the different blocks of the preferred fault trace in agreement with a thrust faulting mechanism.
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Capillary Pressure Curves and Saturation Height Modelling from NMR Fluid Substitution, a new Approach in Carbonate
Authors I. Mondal and K. Hemant SinghSummaryCapillary pressure and saturation-height function are used by petrophysicists or reservoir engineers to compute the water saturation of the reservoir for a given height above the free water level, and it has a significant impact on reserve estimation. The majority of capillary pressure research is done in laboratories using core data. However, the accuracy of discrete sets of core data in representing reservoir properties is still debatable. Modelling of capillary pressure curve at reservoir condition is again a critical task till date. In recent two decades, the application of nuclear magnetic resonance logs in oil and gas exploration has become increasingly popular. But, the use of the information is confined for evaluating porosity, permeability and their distributions. The NMR T2 distributions may now be utilized to simulate the core equivalent capillary pressure curves after the introduction of fluid substitution methods. This paper proposes a new workflow to obtain capillary pressure curves from the NMR T2 distribution by Fluid Substitution methods. Computed resistivity independent water saturation from saturation height function shows excellent correlation with resistivity dependent multimineral derived saturation in the exploratory wells. For the first time so far, the workflow has been implemented in the study area.
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The Analysis of the Natural Radioactivity Anomalies of the Menilites, from Tarcău Nappe
Authors R. Stochici, I. Radulescu and A. Blebea-ApostuSummaryThe aim of the present study is to highlight the anomalous values of the natural radioactivity of the Menilites formation, Eastern Carpathians (Romania), Tarcău Nappe.
In this area are known several landslide-prone areas, as well as methane gas seepages. Their presence and activity are a result of the past tectonic activity in the region, as well as the present-day seismic activity.
The measurements included the determination of 40K, 238U, 232Th concentrations and of natural gamma dose rate been performed in situ, in optimum conditions, as well high-resolution measurements of gamma spectrometry measurements in the laboratory.
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Railroad Inspection Using GPR
Authors B. Neducza, P. Nagy, Z. Prónay, B. Solymosi and E. TörösSummaryThe proposed fast and efficient method helps the users to extrapolate the localized information of trenches or CPT inspections to the whole railroad with non-destructive tools.
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Assessment of Geomechanical and Geophysical Properties Using Evolutionary Polynomial Regression
Authors I. Mircea, M. Stanciucu and A.M. DiaconuSummaryThe paper presents the results of a complex geotechnical evaluation of two sites situated on the alluvial plain of Dâmboviţa River in Bucharest City, Romania, where geotechnical investigations (boreholes and laboratory analyses) were completed with a geophysical survey (cross-hole and down-hole). In spite of short distances between sites, the results illustrate variabilities of sedimentary layers and consequently of geotechnical and geophysical properties. In order to obtain local representative correlations, we apply in the first instance several well-known formulas that link shear wave velocities (Vs) and density (ρ), but the degree of fitness was very poor. In the second stage, we developed several evolutionary polynomials regression algorithms (EPR) which is a relatively new method used to find polynomial correlations between dependent and independent variables. This algorithm represents a method of solving optimization problems, especially when the objective function is nonlinear. The new predicted values were analyzed using statistical parameters and using residual analysis. Thus, based on proposed EPR models we obtain new series of formulas for each layer which allows more precise correlations of geotechnical and geophysical parameters inside of the sedimentary alluvial structure, by reference to the relations proposed in the literature.
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